wandering spider egg sac

Spider Egg Sac: 10 Facts You Should Know (& Identification Chart)

An egg sac is the most important part of a spider’s mating ritual. Female spiders lay one or more egg sac carrying eggs. Each egg sac carries multiple eggs for the future spiderlings. Some species only carry a few eggs in the sac while others carry up to a thousand eggs in the sac.

Spiders consider the egg sac very important. Some female spiders die right after laying the last egg sack. Other female spiders continue laying egg sacks and they even stay with spiderlings until they reach adulthood.

Table of Contents

What Is Spider Egg Sac

A spider egg sac is a woven silk carrier that is used to lay eggs in. The female spider creates the egg sack and its size is often as large as the spider itself. The shape of the spider sack can be round or irregular. The surface of the egg sack can be smooth or spiked.

The female spider either lays the sack in a safe area or carried the egg sack until spiderlings emerge.

Spider egg sacs are sometimes laid in shielded areas such as under rocks, logs, or attached to rocks or pieces of wood. The female can use more silk to cover the egg sac when laid in its final place. The eggs inside are similar to water droplets.

Some spiders carry the egg sack with them attached to the spinnerets. When spiderlings emerge, they climb on the female spider where they remain for up to a few days before moving along and starting life on their own.

Spider Egg Sac Identification

Spider egg sacs vary in size, color, shape, and laying location. Some of these spider sacks are easy to find and identify while others are rarely seen by humans.

Shape and Texture

The shape and texture of the spider sacks are different from one species to another. Many spider sacs have the shape of a round ball. But the roundness of the sac isn’t characteristic of all spiders. Some lay irregular shape sacs. 

These can’t be categorized by any known shape such as a round ball or a square cube. They are fluffy masses of silk that only aim to protect the eggs. Some spiders even lay sacs with a disc shape. It’s the middle of this disc where the eggs are laid.

You can identify spider sacks by their size as well. Some spider sacks are larger than others, but they are never as large as a bowling ball. Studies show spider sacs are never larger than the size of the actual spider laying it. This is why most spider sacs are smaller than a coin. 

Most spider sacs are white. However, many other spider sacs of an off-white color are sometimes easier to identify.

White spider sacs are normally influenced by the color of the silk produced by spiders. Spider sacs can also be brown or yellow in rare cases.

However, spider sacs can never be pink, red, or green. These might be carrying eggs, but not spider eggs.

The easiest way to identify a spider sack is by location. If you see a lump of silk on the spider web, chances are that’s a spider sac. These spider sacs are of spider species that lay sacs, typically in an area close to their habitat or on the spider web, the place they spend most time of their lives.

Spiders that don’t build spider webs can lay sacks in burrows, under leaves, or attach them to different surfaces such as a wall. Spider sacs laid on the ground are the most difficult to identify.

Common Spiders’ Egg Sacs

Some of the egg sacs that are the easiest to identify are laid by common spiders. Black Widow and Wolf Spider egg sacs are the easiest to identify given the popularity of these spiders.

Black Widow Egg Sac

The Black Widow is one of the most dangerous spiders in the US. It lays egg sacs of different colors and different shapes depending on its region. This is why identifying these egg sacs is not easy.

Most Black Widow egg sacs are white. Some are off-white while others are tan or yellow. You can start identifying Black Widow spider sacks by looking at the shape. Round spider sacks are common for the species with pear-shaped sacs being a close second.

A Black Widow egg sac in your house is a sign of trouble as these contain hundreds of eggs. However, it’s rare to see hundreds of spiderlings emerging from one egg sac as the Black Widow female is cannibalistic. The spider eats most of its spiderlings .

Further Reading:

• How to identify a black widow spider .

Brown Recluse Egg Sac

The Brown Recluse is one of the venomous spiders that lay many eggs in a single sac. Most Brown Recluse spider egg sacs have up to 300 eggs inside. But it’s not uncommon to find fewer eggs. As few as 31 eggs have been found laid in Brown Recluse egg sacs.

You can recognize this spider sac by its off-white color. This sac isn’t a perfect round ball. It has a fuzzy round shape with loose woven silk on its outer edge. Spiderlings are in the sac for at least one molt.

• How to identify a brown recluse .

Wolf Spider Egg Sac

Wolf Spiders lay up to 100 eggs in an egg sac. These spiders are roamers, part of a group of spiders that don’t build spider webs. This is why they don’t have a web to lay the sac on.

In turn, female spiders carry the egg sacs on their body attached to the spinnerets. This protects the eggs from predators.

Garden Spider Egg Sac

Garden Spider egg sacs typically contain around 50 eggs. These are almost spherical as they are narrower on aside. These egg sacs can be recognized by their brown color. These are also some of the most durable egg sacs as they resist high wind.

House Spider Egg Sac

The house spider egg sack is spherical with spike-like formations on its outer surface. These are some of the egg sacs spiders can hide on the spider web or carry with them around the house.

Large egg sacs are specific to this species as each sac contains at least 150 eggs. They can contain up to 300 eggs each. However, House Spider eggs are known for a very low survival rate.

Jumping Spider Egg Sac

These spider egg sacs are white or off-white. These are normally laid in special structures made out of silk. These structures resemble a classic tent. The egg sac is laid here for protective purposes.

This silken structure protecting the egg sac also protects Jumping Spiders during the winter through the hibernation period.

Daddy Long Leg Egg Sac

Daddy Long Leg spiders carry the egg sac with them. Hundreds of eggs are found in this white and tan irregular shape sac. Up to 700 eggs are found in the sac.

However, there’s evidence to show many of these eggs aren’t fertilized. Daddy Long Leg egg sacs contain a mix of both fertilized and unfertilized eggs .

Hobo Spider Egg Sac

The female Hobo spider lays anywhere between one and 4 egg sacs. They contain up to 100 eggs each. Hobo Spider egg sacs are made with silk and dirt for extra durability. The Hobo Spider attaches the egg sac to hard surfaces in sheltered areas and shortly dies.

What to do when you find an egg sac?

A spider egg sac inside the house is problematic. It creates an even larger problem compared to finding a single spider as a destroyed spider sac can release hundreds of spiderlings that can escape through the house.

You need to remove the spider sac whenever you find one in your home. Frequently vacuum all floors and remote areas behind furniture to ensure your home is free from spider egg sacs. 

One common mistake when seeing a spider egg sack is to squish it. But stepping on a spider egg sac can accidentally release tens or hundreds of spiderlings around the house.

Even spraying them with vinegar isn’t recommended as the acid in natural vinegar doesn’t have sufficient potency to fully destroy the egg sack and the eggs.

How To Get Rid Of Spider Egg Sacs

Vacuuming is the easiest method of removing spider egg sacs. You can vacuum each egg sac individually and then dispose of the vacuum dust bag. Make sure you don’t break the spider egg sac before vacuuming it as this can release tens and hundreds of spiderlings through the house.

All vacuumed egg sacs need to be placed in a sealed bag when taken to the trash can. They can still hatch inside the trash which doesn’t eliminate the spider problem around the house.

How to Tell If a Spider Egg Sac Empty?

Empty spider egg sacs are easier to move by the wind. You can blow them lightly to see how easy they move. An empty egg sac will move around easily when air is blown as they are pure silk.

Empty egg sacs are also not of a perfect cocoon or sphere shape as they have open areas through which spiderlings have emerged.

Will Vinegar Kill Spider Egg Sacs?

A solution of vinegar and water can kill spiders due to the high concentration of acetic acid. But not egg sacs can be killed using vinegar as they are sometimes constructed to last in front of danger.

For example, Hobo spiders create multi-layered spider egg sacs. These are separated by a layer of soil which might be hard for the vinegar to penetrate fully. 

Will Raid Kill Spider Egg Sacs?

Raid and other special solutions kill spider egg sacks. They are made with chemicals that break down silk and spider eggs quickly. They are applied from a close distance for quick results.

Can You Squish a Spider Egg Sac?

Squishing spider egg sacs is not recommended. This is only going to trigger possible larger problems by releasing hundreds of spiderlings.

Not all spiderlings develop at the same rate. Some eggs might already be hatched inside what seems a simple spider egg sac. Squishing the spider egg sacs normally releases spiderlings from hatched eggs.

Can You Burn a Spider Egg Sac?

Fire destroys many types of spider egg sacs. However, fire can sometimes create minimum damage to a spider egg sac essentially not affecting the eggs inside. As some spiders use soil and other debris when creating the spider egg sac, the durability of these silk builds can be impressive.

It’s best to avoid burning any spider egg sacs in favor of disposing of them using different methods.

Spider egg sacs are recognized by shape, size, and color. Some of these are found through the house, especially in hard-to-reach areas or places that aren’t vacuumed frequently.

You can recognize a spider egg sack by looking at the color and size of the woven silk build. This is normally a white or an off-white ball that is smaller than a dime. 

Spider egg sacs can be laid on the spider web. Many times this egg sac is attached to other surfaces in hard-to-reach areas such as behind furniture when found in homes or under rocks when laid outdoors.

Spiders often build woven shielding structures around the laid egg sac when they don’t build a spider web. Jumping spiders are known for building such protective structures for the egg sac.

Other species of spiders such as Wolf Spiders rarely lay an egg sac. Females of the species carry the egg sac attached to the spinnerets. They hold on to the egg sac until all eggs hatch and spiderlings tend to climb the female where they live for a few days. 

Most eggs inside an egg sac never fully develop as spiderlings. Some of these spiderlings are even seen as food by the hungry female such as in the case of the female Black Widow eating most spiderlings.

Other spider egg sacs are mostly populated by unfertilized eggs such as in the case of Daddy Long Legs spiders.

It’s best to vacuum spider egg sacs when found inside the home. These need to be disposed of as neither vinegar nor fire can fully destroy them. Squishing spider egg sacks isn’t better either. This tends to release hundreds of spiderlings that immediately run making their way through the house.

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How to Identify & Get Rid of Spider Egg Sacs

What do spider egg sacs look like, where do spiders lay egg sacs.

Spiders lay egg sacs in diverse locations. Egg sacs can be found in the spider’s web itself, on the underside of leaves, attached to tree branches or in a burrow. They can also be placed in undisturbed areas of a home or other structures. Some spiders carry their egg sacs attached to their body, providing even more protection for the egg case.

How to Tell If a Spider Egg Sac Is Empty

A spider egg sac can only be empty when all the spiderlings have hatched and gone out of the egg sac. To assess if a spider egg sac is empty or not, you will have to see how easily it moves. The fact that egg sacs are made entirely of silk makes them easily moved when air is pushed over them - so the wind can easily move empty spider egg sacs. Also, an empty egg sac will not be in a perfect cocoon or sphere shape, as spiderlings have emerged through open places in empty egg sacs.

How to Get Rid of Spider Egg Sacs

Disposing of spider egg sacs is much like cleaning away spider webs. The easiest method is with a vacuum cleaner hose. Simply suck up the egg sac, and then throw away the vacuum bag into an outside trash container. If you do not have a vacuum and hose, or the hose or it is not long enough, you can use a broom.

If you’re experiencing a spider infestation , contact an Orkin Pro for help with spider control .

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How to Identify Spider Egg Sacs

Last Updated: April 3, 2024 Fact Checked

This article was co-authored by Shweta Sharma . Shweta Sharma is a Biologist with the U.S. Environmental Protection Agency (EPA). With nearly ten years of experience, she specializes in insect management, integrated pest management, insect behavior, resistance management, ecology, and biological control. She earned her PhD in Urban Entomology and her MS in Environmental Horticulture from the University of Florida. She also holds a BS in Agriculture from the Institute of Agriculture and Animal Sciences, Nepal. There are 10 references cited in this article, which can be found at the bottom of the page. This article has been fact-checked, ensuring the accuracy of any cited facts and confirming the authority of its sources. This article has been viewed 840,108 times.

Many spiders lay their eggs inside a silk egg sac, which is usually hidden in a web, affixed to a surface, or carried by the female. Spiders may produce multiple egg sacs, each containing up to several hundred eggs. The egg sac is made from woven silk and is often roughly the same size as the spider.

Examining the Egg Sac

• a disc with a rounded part in the middle
• squishy pillow
• fluffy mass of silk
• a ball with tiny spikes all over it [2] X Research source

• For example, if you find something that is the size of a soccer ball, then this is not likely to be a spider egg sac. However, if you find something the size of a dime, then there is a good chance that it is a spider egg sac.
• A spider egg sac will be about as big as the spider that made it. [4] X Research source For example, if you have spiders in your area that are about the size of golf balls, then the spider egg sacs may be about the same size.
• Keep in mind that some spiders make just one egg sac, while others make several small ones.

• Observe the color to determine if what you are looking at might be a spider egg sac. For example, if the color of the sac is pink or black, then it is probably not a spider egg sac.

• Some species of spider lay their eggs in sacs that are on the ground, so there might not always be visible webbing.

• If you see any small, pale-colored spiders crawling around what you think might be an egg sac, then it probably is one.

Observing the Spider and Web

• Orbs. Circular patterned webs.
• Cobwebs or tangle. Messy looking fluffy webs that often appear in the corners of ceilings.
• Funnels. Webs in the shape of a tunnel that are located in low-traffic areas.
• Sheet webs. Flat sheet-like or bowl-shaped webs.
• Wooly webs. Slightly sticky webs with an indistinct shape.

• For example, tarantulas often live in burrows in the ground with a thin web covering the opening, disc web spiders often make their small grey webs on tree bark and brick walls, and comb footed spiders often make their webs in houseplants. [11] X Research source

• If you do find the spider that made the egg sac you are trying to identify, getting a good look at the spider is your best chance at getting an accurate identification. [13] X Research source

• Try to notice the details. For example, if the spider is brown, what shade of brown is it? Does it have any other markings? Is it the same shade of brown over her entire body?

• For example, does this spider have hairs that are visible from a distance, like the Bold Jumping Spider, or are the hairs practically invisible even up close, like the hairs on a Brown Recluse?

• Try to be objective. Is the spider the size of a pencil eraser? A quarter? A golf ball? Your fist?
• Most species of spiders have an average size range in inches or centimeters. Try to estimate its size in inches or centimeters to help you as you try to identify it.

Expert Q&A

• Do not try to pick up a spider or spider egg sac if you do not know what it is. Some spiders have venomous bites that can cause pain and severe wounds. Call an exterminator if you think you have an infestation. Thanks Helpful 0 Not Helpful 0

You Might Also Like

• ↑ https://spiderid.com/pictures/?fwp_attributes=egg-sacs
• ↑ http://cisr.ucr.edu/identifying_brown_widow_spiders.html
• ↑ http://bugguide.net/node/view/285060/bgimage
• ↑ https://www.terminix.com/pest-control/spiders/removal/egg-sac/
• ↑ http://www.scilogs.com/expiscor/silken-treasures-a-gallery-of-spider-egg-sacs
• ↑ https://journeynorth.org/tm/spring/SpiderLife.html
• ↑ http://www.backyardnature.net/spiders.htm
• ↑ http://baynature.org/article/spiders/
• ↑ http://www.nhm.org/site/activities-programs/citizen-science/spider-survey/identifying-spiders
• ↑ http://bugguide.net/node/view/6/bgimage

About This Article

To identify spider egg sacs, start by looking at the shape of the object. If it's a round ball or a tiny ball with spikes all over it, it could be a spider egg sac. Also, check to see how big the object is. Spider egg sacs are typically smaller than a quarter. The color of spider egg sacs are typically white or off-white, though some may be brown, yellow, or yellowish-green. You can also look around to see if a spider web is nearby since spiders often leave their egg sacs with their webs. To learn how to identify different spiders’ web patterns, keep reading tips from our Veterinary reviewer! Did this summary help you? Yes No

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Everything to Know About Spider Eggs (Including How to Get Rid of Them)

Stumbled upon a silky sac? Here’s what to know before the little ones hatch.

If you’re anything like my aunt Susan, you spend your afternoons swatting at spider webs in the corners of the room with a straw broom. But what happens when you stumble upon a little ball of babies? Finding spider eggs in your home can be unsettling, but if it happens to you, there’s no need to freak out just yet.

Plus, spider bites aren’t as common as you might think. “People wake up with some sort of skin infection or lesion , which could have 50 causes, and they say ‘I have a spider bite,’” Crawford says. “I challenge even one to produce a spider that actually bit them.”

Nancy Miorelli , an entomologist who runs bug spotting tours in Ecuador , agrees that spiders “are excellent at pest control.” But if that doesn’t put you at ease (and you don’t want a spider and its offspring as roommates), here are a few things to know about how to identify spider eggs and what you can do to get rid of them.

First, where do spiders live? And where do they lay eggs in houses?

Miorelli says you’re likely to find spiders in dark, unvisited corners of your house (think: closets, attics, and furnace rooms), as well as humid areas like the basement or bathroom. “Spiders like the humidity,” she explains. “Arthropods have holes alongside their body, and if the atmospheric humidity is high enough they can get all the moisture they need form the atmosphere.”

When do spiders lay eggs?

Since spiders are in your house, they benefit from the same environmental factors that humans do, like consistent temperature throughout the year. This likely has an effect on the egg laying times of many species, meaning “they probably lay their eggs year-round,” says Miorelli.

What do spider eggs look and feel like?

While all species create different eggs—and different-looking eggs—you might have to look hard to see them. Most often, the eggs are not out in the open, but rather in a silky egg sac. “It’s a little round ball. They can be different colors but they’re usually white. Often ball bearing sized or smaller,” says Miorelli. Textures can also vary: Some will be smooth while others are fluffy.

Another thing to look out for: the mama. “Spiders are actually really good mothers, they take care of their babies,” says Miorelli. Because of this, you’re likely to find a spider near its eggs. Many species will put their eggs in their web, while some carry them on their backs or even drag them along on a line of silk.

How long do spider eggs take to hatch?

“It really depends on the species. A couple weeks is a good estimate for hatching, and then you get little babies,” says Miorelli. “Depending on the species, they may hang in the web for a little bit before they disperse.”

The method of dispersal can have an effect on how far they travel. “Most spiders, especially web builders, they’ll set up a little piece of silk and wind or free-floating static electricity will pick them up and spread them,” Miorelli explains. “From the spider perspective, you want the kids to go away, you don’t want them to compete with your resources. That’s why we send our kids to college—spider moms feel the same way, and siblings too. In a basement you can’t disperse as much so you may have clusters of webs.”

How to get rid of spider eggs

If you’re trying to get rid of spider eggs, you can do so with only a few steps—and you don’t need to kill the spider to do it successfully (unless they really creep you out). “Use a cup or shot glass—any small container will work—and a piece of paper,” Miorelli suggests. “Put the sac in the cup and cover it with the paper. Usually the mother is close by, so if you touch the web the mother might come over to the egg sac and you’ll take both.” Then, dispose of them outdoors or wherever you prefer.

If that’s too close for comfort, our guide on how to get rid of spiders in your home offers a few more tips—say, simply using a vacuum will also do the trick!

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Spider Eggs: All You Need to Know in a Jiffy

Spiders are fascinating creatures, and their reproduction process is no exception. One area of interest is their eggs, which are laid in silk sacs and contain spiderlings waiting to hatch. To better understand these arachnids, let’s dive into the details of spider eggs.

As you encounter spider eggs, it’s important to know that they can come in different sizes and colors, depending on the species. For instance, some may be small and white, while others could be larger and brown. They are typically found in hidden corners, nooks, or even on plants outside your home.

Keep in mind that spiders play a vital role in maintaining a healthy ecosystem, as they control insect populations. As we explore this topic, you’ll learn everything you need to know about spider eggs and their importance in the world of spiders.

Understanding Spiders

Spiders are fascinating creatures with over 48,000 different spider species around the world. You might encounter some common species such as the wolf spider, black widow spider, brown recluse spiders, brown widow spider, or even tarantulas.

Each spider is unique in its own way, but they all share certain common characteristics that make them stand out in the world of arachnids. Some examples of shared characteristics include the ability to produce silk and having eight legs.

Here’s a comparison table highlighting the key features of some common spider species:

When you encounter spiders, it’s essential to know some of their key features to understand how they function. Some spider species are venomous, such as the black widow and brown recluse spiders, and their bites can pose a threat to humans. On the other hand, most spiders, like the wolf spider and tarantulas, are harmless and help control insect populations.

It’s also important to note that not all spiders spin webs to catch prey. Many spiders, like the wolf spider, are hunters and do not rely on webs. However, they still use silk for other purposes, like protecting their eggs.

Understanding spiders can help you appreciate their significant role in ecosystems, and knowing how to identify them can keep you safe during your outdoor adventures.

Spider Anatomy

As you learn about spider eggs, it’s essential to understand some basics about spider anatomy. Adult female spiders play a vital role in the reproduction process as they lay eggs and protect them.

Spiders go through a process called molting as they grow and develop. Molting is when a spider sheds its exoskeleton or outer skin to make room for growth. This process occurs multiple times before they reach sexual maturity.

• Sexual maturity varies among spider species.
• Lifespan also differs depending on species.

For example, some spiders may reach sexual maturity within a few months, while others may take years. It’s essential to know that the female spider’s primary objective is protecting their eggs once they have been laid. These are some basic behaviors and characteristics that help in this process:

• Adult female spiders often guard their eggs.
• Spiders use different strategies to keep predators away from their eggs.
• Egg sacs may be hidden or camouflaged in the web or their habitat.

As you discover more about spider eggs, remembering these fundamental aspects of spider anatomy and behavior will enhance your understanding of the reproduction process. The importance of adult female spiders, along with their molting, sexual maturity, and lifespan, play a crucial role in the existence of these fascinating creatures.

All About Spider Eggs

Color, size and shape.

Spider egg sacs come in various colors, sizes, and shapes. They can be:

• Cream-white

The shape of the egg sac may be round or more irregular depending on the species. The size of the sac can vary as well, with some being as small as a few millimeters and others growing larger.

Where Spiders Lay Their Eggs

Spiders lay their eggs in various locations, such as:

They typically choose locations that provide protection and safety for their spiderlings.

Lifecycle of Spider Eggs

The lifecycle of spider eggs follows a simple process:

• The female spider lays eggs and wraps them in a silk sac.
• The eggs hatch within the sac, producing spiderlings.
• Spiderlings grow, molt, and develop until they’re ready to leave the nest area and disperse.

Identifying spider eggs and their egg sacs can be essential for controlling and managing spider populations.

Common Species and Their Egg Characteristics

Here’s a comparison table of common species and their egg characteristics:

Knowing the characteristics of the egg sacs will make it easier for you to identify the spider species and deal with them accordingly.

Remember to always be cautious when handling spider eggs and spiderlings and to consult a professional if you’re unsure about the species or how to remove them safely.

Preventing Infestation

Indoor prevention.

To tackle a spider infestation indoors, start by vacuuming regularly. Your vacuum cleaner can help you get rid of spider eggs hidden in corners, on ceilings, and under furniture. For hard-to-reach places, use a broom to sweep away webs and egg sacs.

To deter spiders from moving in, reduce clutter around your home. Spiders love dark and secluded spaces, so keeping your living areas neat and tidy is essential. Another helpful method is using essential oils , such as:

• Peppermint oil
• Tea tree oil
• Cedar oil These oils can repel spiders and help in maintaining a spider-free environment.

Outdoor Prevention

For outdoor prevention, focus on removing ideal habitats for spiders. You should:

• Remove woodpiles and rocks near your home, as they attract spiders.
• Regularly trim bushes and shrubs to prevent spiders from nesting.
• Seal any gaps and cracks that spiders may use to enter your home.

By taking these precautions, you can effectively reduce the chances of a spider infestation in and around your home. Remember, prevention is the key to maintaining a pest-free living space.

Dealing with an Infestation

When you find yourself dealing with a spider infestation in your home, there are different options to tackle the problem. In this section, we will discuss both home remedies and professional pest control methods.

Home Remedies

There are a few home remedies you can try to help control and dispose of spider infestations:

• Bleach solution : Mix one part bleach to three parts water in a spray bottle, and spray it directly onto the spiders and their webs. This may help kill them and clear the affected area.
• Fly swatter : Use a fly swatter to manually kill spiders when you see them. While this may not be a long-term solution, it can provide temporary relief.
• Natural repellents : Some essential oils, like peppermint and eucalyptus, can act as natural spider repellents. Spray the oils around the infested area and entry points to help deter spiders.

Pros of Home Remedies:

• Inexpensive and readily available
• You can start immediately

Cons of Home Remedies:

• May not be effective for severe infestations
• Requires consistent effort

Professional Pest Control

When home remedies aren’t enough to handle a spider infestation, consider hiring a professional pest control service. These experts have the tools and knowledge needed to effectively treat and dispose of spider infestations in your home.

Pros of Professional Pest Control:

• Highly effective and tailored specifically to your home and infestation
• Can provide long-lasting solutions and prevention strategies

Cons of Professional Pest Control:

• Can be more expensive than home remedies
• May require ongoing maintenance appointments

In summary, dealing with a spider infestation can be challenging, but there are both home remedies and professional services available to help you regain control of your living space. Choose the option that best suits your needs, and remember that maintaining a clean home can help prevent future infestations.

Ecological Significance of Spiders and Their Eggs

Spiders are amazing creatures that play a crucial role in our ecosystem. They help control the population of mosquitoes , flies, and other pests by preying on them. Because of this, they act as natural predators and contribute to maintaining the balance in nature.

Insects like mosquitoes can become a nuisance and even transmit diseases, so it’s beneficial to have spiders around. For instance, the notorious black widow spider feeds on mosquitoes and other insects. However, be cautious because this species is venomous.

When it comes to reproduction, spiders lay their eggs in clusters, sometimes covering them with a sheet of silk for protection. Having a safe place for their eggs is essential, as humidity and temperature can affect their development.

Some spiders, such as the brown recluse, lay their eggs in secluded places like garages or basements. This is important for their survival, as it helps shield them from predators and environmental factors.

While spiders can be a little creepy, they play a vital role in maintaining ecological balance. It’s essential to understand their significance and learn to appreciate these amazing creatures for the help they provide in controlling unwanted pests. So next time you spot a spider or its eggs, remember the benefits they bring to your environment!

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Over the years, our website, whatsthatbug.com has received hundreds of letters and some interesting images asking us about these insects. Scroll down to have a look at some of them.

Letter 1 – Black and Yellow Orb Weaver with Eggsack

Hi Charlotte, Your letter doesn’t really indicate why you feel it is necessary to relocate this magnificent Argiope aurantia who found an ideal location for her nursery. Argiope aurantia has numerous common names, that are sometimes confusing, like Garden Spider, Black and Yellow Orbweaver, and Golden Orbweaver. She can and will bite if provoked, but she is not a threat to you or your family.

Letter 2 – Spider Egg Sac from Australia

Dear Kangaroo’ Room kids, We will attempt to identify your Spider Egg Sac, but our gut feeling is that this is an Orbweaver Egg Sac.  What we find most surprising is the few individual spiderlings inside.  They also seem quite large to be hatchlings.  Normally we expect to see hundreds of spiderlings emerge from an Egg Sac.  Perhaps a survival strategy for this species is to have the hatchlings cannibalize one another while still in the egg sac, ensuring that the strongest survive, and freeing them from having to hunt for food while very young.  Spiders are predators.  Try feeding them small insects like Aphids.

Letter 3 – Bolas Spider Eggs

Happy New Year Becky G, We agree with you that these are Bolas Spider Egg Sacs , not those of a Bolsa Spidea.  Bolas Spiders are very well camouflaged and are difficult to find.  The egg sacs we reported on in November appear to have been parasitized, but we have hopes that a few individuals will hatch to perpetuate the species in our garden.

Letter 4 – Bolas Spider with Egg Sac

Dear Ohio, You are correct that this Egg Sac was made by a spider, and if you look closely at the roundish white and brown object at the bottom of the Egg Sac, you can make out the body of the female Bolas Spider in the genus Mastophora that is guarding the Egg Sac.  The female Bolas Spider is an excellent bird dropping mimic, and she can be expected to lay several more Egg Sacs before dying at the onset of cold weather.  Bolas Spiders like other Orbweavers are considered harmless, yet beneficial creatures in the garden.

Letter 5 – Basilica Orbweaver, not Cyclosa bifurca

Wow Connie, Nice photo of Cyclosa bifurca. Here is what Comstock has to say: “The strange form of the abdomen sharply distinguishes this species from the othe species of Cyclosa in our fauna. The abdomen is long; the basal half bears two pairs of humps; the caudal half is more slender and is bifurcate at the tip. The body is green mottled with white; there is a light wavy band on the side of the abdomen; and the abdomen is bordered with a black line above, back of the humps. On the ventral side of the abdomen, there is a bright red spot between the epigastric furrow and the spinnerets. The legs are banded with reddish brown. I found this to be a common species near Miami, Fla. I first found it in the jungle near the shore of the bay, where it made an orb-web with a string of eggsacs across it like a stabilimentum.” Thank you for your wonderful addition to our site, especially since I could not find any photos online.

Correction November 28, 2010 Today we received a new identification request which led us on an identification search on BugGuide that ended with a new identification for this egg sac configuration:  the Basilica Spider, Mecynogea lemniscata.

Bugman aka Daniel Marlos has been identifying bugs since 1999. whatsthatbug.com is his passion project and it has helped millions of readers identify the bug that has been bugging them for over two decades. You can reach out to him through our Contact Page .

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Piyushi is a nature lover, blogger and traveler at heart. She lives in beautiful Canada with her family. Piyushi is an animal lover and loves to write about all creatures.

3 thoughts on “Spider Eggs: All You Need to Know in a Jiffy”

Mimetids hang their egg sac like this.

Thank you for ID/info. How many eggs are in just one of those pearls?

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Animal Corner

Discover the many amazing animals that live on our planet.

Brazilian Wandering Spider

The Brazilian Wandering Spider (Phoneutria fera) is an aggressive and highly venomous spider . It was first discovered in Brazil hence its name. However, this genus is known to exist elsewhere in South and Central America .

The Brazilian Wandering spider is a member of the Ctenidae family of wandering spiders.

The Brazilian Wandering spider appeared in the Guinness Book of World Records 2007 for being the most venomous animal .

In this particular genus, there are five known similar species whose members are also highly venomous. They include some of the relatively few species of spiders that present a threat to human beings.

Brazilian Wandering Spider Characteristics

The Brazilian wandering spider can grow to have a leg span of up to 4 – 5 inches. They are large hairy spindly-looking spiders who have eight eyes, two of which are large. Brazilian wandering spiders are fast-moving spiders, their legs are strong and spiny and they have distinctive red jaws which they display when angered.

The Brazilian wandering spider is not a Tarantula . Brazilian wandering spiders are not even in the same family group. Tarantulas are harmless to humans and are mostly ambush killers who wait for prey to come to them. Brazilian wandering spiders are active hunters. Brazilian wandering spiders and Tarantulas do have one thing in common, however, they do not eat bananas.

Brazilian Wandering Spider Habitat and Spider Webs

The Brazilian Wandering spider is so-called because it wanders the jungle floor, rather than residing in a lair or maintaining a web. This is another reason it is considered so dangerous. In densely populated areas, the Brazilian Wandering spider will usually search for cover and dark places to hide during daytime, leading it to hide within houses, clothes, cars, boots, boxes and log piles. This usually causes accidents when people disturb them.

The Brazilian Wandering spider is also called the ‘banana spider’ as it is occasionally found within shipments of bananas. As a result, any large spider appearing in a bunch of bananas should be treated with due care.

Brazilian Wandering Spider Diet

Adult Brazilian Wandering spiders eat crickets, other large insects, small lizards and mice. Spiderlings of this species eat flightless fruit flies and pinhead crickets.

Brazilian Wandering Spider Reproduction

All spiders produce silk, a thin, strong protein strand extruded by the spider from spinnerets most commonly found on the end of the abdomen. Many species use it to trap insects in webs, although there are many species that hunt freely such as the Brazilian Wandering spider. Silk can be used to aid in climbing, form smooth walls for burrows, build egg sacs, wrap prey and temporarily hold sperm, among other applications.

Brazilian Wandering spiders reproduce by means of eggs, which are packed into silk bundles called egg sacs. The male spider must (in most cases) make a timely departure after mating to escape before the females normal predatory instincts return.

Mature male spiders have swollen bulbs on the end of their palps for this purpose and this is a useful way to identify whether the spider is male or female. Once the sperm is inside the female spider, she stores it in a chamber and only uses it during the egg-laying process, when the eggs come into contact with the male sperm for the first time and are fertilized. The Brazilian Wandering spiders life cycle is 1 – 2 years.

Brazilian Wandering Spider Venom

Bites from the Brazilian Wandering spider may result in only a couple of painful pinpricks to full-blown envenomed. In either case, people bitten by this spider or any Ctenid should seek immediate emergency treatment as the venom is possibly life threatening.

The Phoneutria fera and Phoneutria nigriventer (two species of wandering spider) are the two most commonly implicated as the most vicious and deadly of the Phoneutria spiders.

The Phoneutria not only has a potent neurotoxin, but is reported to have one of the most excruciatingly painful envenoms of all spiders due to its high concentration of serotonin. They have the most active venom of any living spiders.

One of their members, the Brazilian Huntsman, is thought to be the most venomous spider in the world. Brazilian wandering spiders are certainly dangerous and bite more people than any other spiders.

Check out more  animals that begin with the letter B

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I've always been passionate about animals which led me to a career in training and behaviour. As an animal professional I'm committed to improving relationships between people and animals to bring them more happiness.

Brazilian wandering spiders: Bites & other facts

The spider's name means "murderess" in Greek, which is appropriate for the deadly arachnid.

Classification/taxonomy

Size & characteristics, bites and venom, additional resources.

The Brazilian wandering spider, also called armed spiders or banana spiders, belongs to the genus Phoneutria , which means "murderess" in Greek. And it's no wonder why — it's one of the most venomous spiders on Earth . Its bite, which delivers neurotoxic venom, can be deadly to humans, especially children, although antivenom makes death unlikely.

Guinness World Records has previously named the Brazilian wandering spider the world's most venomous spider multiple times (though the current record-holder is the Sydney funnel-web spider, Atrax robustus , according to Guinness ). But, as the late Jo-Anne Sewlal, who was an arachnologist at the University of the West Indies in Trinidad and Tobago, told Live Science, "classifying an animal as deadly is controversial," as the amount of damage depends on the amount of venom injected. 

Jo-Anne Sewlal was a noted arachnologist from Trinidad and Tobago. While completing her PhD, she received the National Institute of Higher Education, Research, Science and Technology (NIHERST) 2012 Award for Excellence in Science and Technology for Junior Scientist. In 2013, She received a doctorate in zoology from the University of the West Indies. She discovered several species of spiders in her home country, surveyed the arachnids across several countries the Caribbean and appeared as an expert on the topic on The Science Channel. She died of an allergic reaction in January 2020.

There are nine species of Brazilian wandering spider, all of which are nocturnal and can be found in Brazil. Some species also can be found throughout Central and South America, from Costa Rica to Argentina, according to a 2008 article in the journal American Entomologist . Study author Richard S. Vetter, a research associate in the department of entomology at the University of California, Agriculture and Natural Resources, wrote that specimens of these powerful arachnids have been mistakenly exported to North America and Europe in banana shipments. However, Vetter noted, in many cases of cargo infestation, the spider in question is a harmless banana spider (genus Cupiennius ) that is misidentified as a Phoneutria . The two types of spiders look similar.

The taxonomy of Brazilian wandering spiders, according to the Integrated Taxonomic Information System (ITIS) , is:

Kingdom : Animalia Subkingdom : Bilateria Infrakingdom : Protostomia Superphylum : Ecdysozoa Phylum : Arthropoda Subphylum : Chelicerata Class : Arachnida Order : Araneae Family : Ctenidae Genus : Phoneutria  

• Phoneutria bahiensis
• Phoneutria boliviensis
• Phoneutria eickstedtae
• Phoneutria fera
• Phoneutria keyserlingi
• Phoneutria nigriventer
• Phoneutria pertyi
• Phoneutria reidyi
• Phoneutria depilata , according to a 2021 study published in the journal ZooKeys , which found that Phoneutria boliviensis actually included two separate species from different habitats. 

Brazilian wandering spiders are large, with bodies reaching up to 2 inches (5 centimeters) and a leg span of up to 7 inches (18 cm), according to the Natural History Museum in Karlsruhe, Germany. The species vary in color, though all are hairy and mostly brown and gray, although some species have lightly colored spots on their abdomen. Many species have bands of black and yellow or white on the underside of the two front legs, according to the University of Florida . 

These arachnids "are called wandering spiders because they do not build webs but wander on the forest floor at night, actively hunting prey," Sewlal told Live Science in an interview conducted in 2014, before her death. They kill by both ambush and direct attack.

They spend most of their day hiding under logs or in crevices, and come out to hunt at night. They eat insects, other spiders and sometimes, small amphibians, reptiles and mice. 

Research into one species of Brazilian wandering spider, Phoneutria boliviensis , revealed that these spiders eat a mix of arthropods and reptiles. DNA metabarcoding, a technique that examines the DNA and RNA in a sample, of the guts of 57 spiders identified 96 prey species, including flies, beetles, butterflies, moths, grasshoppers, locusts and crickets, according to research from the University of Tolima and the University of Ibagué in Colombia . Some of the female spiders also ate lizards and snakes.

While their bites are powerful and painful, "their bites are a means of self-defense and only done if they are provoked intentionally or by accident," Sewlal said.

In the Brazilian wandering spider, just as in most spider species, the female is larger than the male. Males approach females cautiously when attempting to mate, according to the biology department at the University of Wisconsin-La Crosse . Males perform a dance to get females' attention, and males often fight each other over the female. The female can be picky, and she often turns down many males before choosing a mating partner. Once she does pick one, the male needs to watch out; females often attack the males once copulation is finished.

The female then can store the sperm in a separate chamber from the eggs until she is ready to fertilize them. She will lay up to 1,000 eggs at a time, which are kept safe in a spun-silk egg sac.

Brazilian wandering spiders typically live for one or two years.

Brazilian wandering spiders' venom is a complex cocktail of toxins, proteins and peptides, according to the Natural History Museum in Karlsruhe, Germany. The venom affects ion channels and chemical receptors in victims' neuromuscular systems.

After a human is bitten by one of these spiders, he or she may experience initial symptoms such as severe burning pain at the site of the bite, sweating and goosebumps, Sewlal said. Within 30 minutes, symptoms become systemic and include high or low blood pressure , fast or a slow heart rate , nausea, abdominal cramping, hypothermia, vertigo, blurred vision, convulsions and excessive sweating associated with shock. People who are bitten by a Brazilian wandering spider should seek medical attention immediately.

Their  venom is perhaps most famous for triggering painful and long-lasting erections . For that reason, in a 2023 study, scientists reported that they were testing the venom in humans as a potential treatment for erectile dysfunction in those for whom Viagra didn't work.

However, these bites are rare, and envenomations, or exposure to these toxins from a spider bite, are usually mild, Vetter said. For instance, a 2000 study in the journal Revista do Instituto de Medicina Tropical de São Paulo found that only 2.3% of people with bites who came to a Brazilian hospital over a 13-year period were treated with antivenom. (The other bites did not contain enough venom to require it.) Most of the bites were from the species P. nigriventer and P. keyserlingi in eastern coastal Brazil. About 4,000 bites reportedly happen each year in Brazil, but only 0.5% of those cases are severe, according to a 2018 study in the journal Clinical Toxinology in Australia, Europe, and Americas . Meanwhile, 15 deaths have been attributed to Phoneutria in Brazil since 1903, the 2018 study reported. 

"It is unlikely that the spider would inject all of its venom into you, as this venom is not only needed as a means of defense but to immobilize prey," Sewlal said. "So if it did inject all of its venom, it [would] have to wait until its body manufactured more before it could hunt." That would also leave the spider vulnerable to being attacked by predators.

Furthermore, Sewlal pointed out that venom production requires a lot of a spider's resources and time. "So if the spider were to attack frequently and use up all of its venom, it [would] be safe to assume that it has a ready food supply to replace the energy and resources used. This situation does not exist in the wild."

• Learn more about Brazilian wandering spiders from the University of Wisconsin-La Crosse .
• Read about several species of Brazilian wandering spiders, including several images of the arachnids at the University of Florida .
• Find a spider in your bananas? It may or may not be a deadly species, according to the University of California, Riverside .

This article was originally published on Nov. 20, 2014. 

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Jessie Szalay is a contributing writer to FSR Magazine. Prior to writing for Live Science, she was an editor at Living Social. She holds an MFA in nonfiction writing from George Mason University and a bachelor's degree in sociology from Kenyon College. 

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Brazilian Wandering Spider: Size, Bite, Diet and Other Facts 

The Brazilian Wandering Spider is a venomous arachnid with a fearsome reputation. This South American rainforest dweller packs a powerful punch, but don’t let its nickname “banana spider” fool you – they’re active hunters, not web-spinners. Despite their size and venom, bites are uncommon as they’re typically shy.

The Brazilian Wandering Spider has garnered significant attention due to its potent venom, which makes it one of the world’s most venomous spiders. Understanding its biology and behavior is crucial for both scientific research and public safety.

Table of Contents

Scientific classification

The Brazilian Wandering Spider belongs to the family Ctenidae within the order Araneae. Its scientific classification is as follows:

• Kingdom: Animalia
• Phylum: Arthropoda
• Class: Arachnida
• Order: Araneae
• Family: Ctenidae
• Genus: Phoneutria

The Brazilian Wandering Spider goes by various common names, including “armed spider,” “banana spider,” and “wandering spider.” Synonyms for this species may include Ctenus , which was formerly used for some Phoneutria species.

Distribution and habitat

Distribution:

• South American:  Found throughout most of South America east of the Andes mountains, including countries like Brazil (their namesake), Argentina, Paraguay, and up into northern regions.
• Central American Touch:  A few species even reach southern Central America.
• Rainforest Dwellers:  Primarily found in the lush rainforests of South America.
• Not Picky Places:  They can also adapt to other habitats like the Atlantic Forest and even some urban areas.
• Daytime Hideouts:  While they wander at night, they seek shelter during the day in places like termite mounds, under rocks, or even (unintentionally) in bananas!

Physical Characteristics

 size and weight.

The Brazilian wandering spider is a creepy crawly giant. Their bodies can grow up to 2 inches (5 centimeters) long, but that’s not the scary part. Their legs can span a whopping 7 inches (18 cm), making them look even bigger. They are one of the biggest true spiders by body weight and size.

Despite their impressive leg span, Brazilian wandering spiders are relatively light. They only weigh around 6 grams, which is about the same as two pennies. While they might look imposing, they’re not the heaviest arachnids around.

Coloration and markings

These spiders exhibit a range of colors, including brown, black, and sometimes reddish hues. They often have distinctive markings on their bodies, which can vary between species. These markings may include stripes or patterns that serve as a key identification feature.

Notable features

One of the most notable features of the Brazilian Wandering Spider is its elongated, robust body and long, agile legs. They have sharp fangs, which they use to inject venom into their prey or in self-defense.

Sexual dimorphism

Sexual dimorphism is evident in this species. Females are larger and bulkier than males, while males have longer, more slender legs. Additionally, males possess specialized structures known as pedipalps, which are used during mating.

In the following sections of this article, we will delve deeper into the behavior, venom, and ecological role of the Brazilian Wandering Spider, shedding light on why this species has both fascinated and instilled fear in those who encounter it.

 Behavior and Ecology

 Nocturnal habits

Brazilian Wandering Spiders are primarily nocturnal creatures. They are most active during the night, venturing out of their daytime hiding places to hunt for prey and engage in mating activities. Their nighttime activity allows them to avoid predators and reduce the risk of desiccation in the hot tropical sun.

Hunting and feeding behavior

These spiders are agile hunters and primarily feed on insects, small vertebrates, and other arachnids. They do not build webs to capture prey but instead rely on their excellent senses, including acute vision and touch, to locate and stalk their victims. They often wander in search of food and are known for their swift and lethal strikes. Once they subdue their prey, they inject venom to immobilize it before feeding.

Brazilian Wandering Spiders (Phoneutria) are active hunters and have distinctive feeding behaviors. Here’s an overview of their feeding habits:

• Active Predators: Brazilian Wandering Spiders are not web-builders like many other spider species. Instead, they are active predators. They actively roam their environment in search of prey rather than waiting for insects to stumble into a web.
• Hunting Strategy: When hunting, these spiders use their excellent senses, including acute vision and touch, to locate potential prey. They are known for their agility and speed, which they use to stalk and capture their victims. They have sharp fangs, which they use to deliver a venomous bite to immobilize their prey.
• Diet: Their diet consists primarily of insects and other arthropods, but they are opportunistic feeders and may consume a variety of small creatures, including small vertebrates such as frogs and lizards when the opportunity arises.
• Venom Use: Brazilian Wandering Spiders inject venom into their prey to immobilize and partially digest it. Their venom contains neurotoxins that affect the nervous system of their victims. Once the prey is incapacitated, the spider can feed on it at its leisure.
• Feeding Process: After subduing their prey with a venomous bite, the spider uses its chelicerae (fangs) to break down the prey’s tissues. The venom also helps in predigestion, turning the prey’s insides into a semi-liquid form that the spider can ingest. They can consume both the internal fluids and solid parts of their prey.
• Frequency of Feeding: The frequency of feeding can vary depending on factors such as the availability of prey and the spider’s size. Generally, they need to feed periodically to sustain their energy and growth. Spiderlings may require more frequent meals to support their rapid growth, while adults can go longer periods between meals.

Overall, the Brazilian Wandering Spider’s feeding strategy is well-suited for their active and wandering lifestyle, allowing them to efficiently capture and consume a variety of prey in their natural habitat.

Role in the ecosystem

The Brazilian Wandering Spider plays a vital role in controlling insect populations within its habitat. By preying on a variety of insects and other small creatures, they help maintain ecological balance. Additionally, their presence in the rainforest ecosystem contributes to the overall biodiversity and food web.

Mating and reproduction

Mating in Brazilian Wandering Spiders is a complex and potentially dangerous process. Male spiders must carefully approach and court a receptive female to avoid being mistaken for prey. They use specialized pedipalps to transfer sperm to the female’s reproductive organs. After successful mating, females lay egg sacs containing hundreds of eggs. They guard these sacs and ensure the survival of their offspring until they hatch.

 Lifespan and growth

The lifespan of Brazilian Wandering Spiders varies between males and females. Males generally have a shorter lifespan, typically living for a few months to a year after reaching maturity. Females, on the other hand, can live for several years. The growth of these spiders involves a series of molts, during which they shed their exoskeletons to accommodate their increasing size. Molting is a vulnerable period in their lives as their new exoskeleton is initially soft and requires time to harden.

Venom and Envenomation

Composition of venom.

The venom of Brazilian Wandering Spiders is a complex mixture of neurotoxins, cytotoxins, and other enzymes. One of the most significant components is a neurotoxin called PhTx3, which targets the nervous system of their prey.

Toxicity and effects on humans

The venom of these spiders is highly potent and can be lethal to their prey. In humans, envenomation can cause a range of symptoms, including intense pain, muscle cramps, fever, nausea, and in severe cases, paralysis and death. It’s important to note that while their venom is potent, actual fatalities from Brazilian Wandering Spider bites are rare due to the availability of medical treatment.

First aid and medical treatment

In the event of a Brazilian Wandering Spider bite, immediate medical attention is crucial. First aid measures may include cleaning the wound and applying ice to reduce pain and swelling. However, the primary treatment involves antivenom, which can counteract the effects of the spider’s venom.

Cases of envenomation and fatalities

Although fatalities from Brazilian Wandering Spider bites are uncommon, there have been documented cases of severe envenomation, especially in regions where medical treatment is not readily available. These spiders are generally non-aggressive and will bite humans only in self-defense when provoked, or if they feel cornered.

Understanding the behavior, ecology, and venomous nature of the Brazilian Wandering Spider is crucial for both scientific research and public awareness, helping to minimize the risk of envenomation and promote coexistence with this remarkable but potentially dangerous arachnid.

Brazilian wandering spider life cycle

The Brazilian wandering spider has a fascinating life cycle that revolves around hunting and motherhood. Here’s a breakdown:

• Egg Haven:  After mating, the female lays hundreds, sometimes even a thousand, eggs in a silken sac. This becomes their protected nursery.
• Tiny Terrors:  Hatching from the eggs emerge translucent spiderlings called larvae.
• Nymph Stage:  The larvae molt a few times, transforming into nymphs. Think of them as mini-adults but without the ability to reproduce yet.
• Shedding for Size:  As nymphs grow, they undergo multiple molts, shedding their outer shell to accommodate their larger bodies.
• Ready to Roam:  After the final molt, the spider emerges as a full-fledged adult, complete with reproductive organs. Now, they can join the wandering lifestyle and continue the cycle.

The life cycle begins when a female Brazilian Wandering Spider lays her eggs. She typically creates an egg sac made of silk and deposits it in a concealed location, such as a tree hollow or leaf litter. Inside the sac, she may lay hundreds of eggs. The female guards the egg sac and ensures its protection until the spiderlings hatch. The duration of the egg stage varies depending on environmental conditions but generally lasts for a few weeks.

Spiderling Stage

After the incubation period, spiderlings (young spiders) emerge from the egg sac. They are extremely vulnerable at this stage and rely on their mother’s protection and guidance. Spiderlings are miniature versions of adult spiders but lack the full coloration and size. They disperse from the nest once they have molted and are capable of hunting on their own. During this stage, they grow rapidly by molting, shedding their exoskeletons to accommodate their increasing size.

Juvenile Stage

As spiderlings continue to molt and grow, they progress into the juvenile stage. During this phase, their coloration becomes more distinct, and they start to develop the characteristic features of adult Brazilian Wandering Spiders. They become increasingly independent and begin to exhibit hunting behaviors. The duration of the juvenile stage can vary but often lasts several months.

Sub-Adult Stage

The sub-adult stage is an intermediate phase between juvenile and adult. At this point, the spiders are closer in size and appearance to adults but have not yet reached sexual maturity. They continue to molt, with the frequency of molting gradually decreasing as they approach adulthood. Sub-adult spiders may exhibit more territorial behaviors as they compete for resources and prepare for eventual mating.

Adult Stage

Upon reaching sexual maturity, Brazilian Wandering Spiders enter the adult stage. This is when they are fully developed and capable of reproduction. Females are larger and bulkier than males, and males possess specialized structures called pedipalps, which they use during mating. Adult spiders engage in mating activities, and females lay eggs to continue the life cycle. Adult Brazilian Wandering Spiders can live for several years, with females typically having longer lifespans than males.

Understanding the life cycle of these spiders is essential for studying their behavior, reproductive biology, and population dynamics. It also provides insights into their adaptation strategies in the complex ecosystems of South and Central America.

Brazilian Wandering Spider Bite

Brazilian Wandering Spiders are known for their potent venom and, occasionally, their bites on humans. While bites are relatively rare due to the spider’s non-aggressive nature, understanding the consequences of a bite is crucial for public safety.

Studying Brazilian Wandering Spider bites is of great interest for several reasons. It helps healthcare professionals provide appropriate medical treatment, raises awareness among communities in spider habitats, and contributes to our understanding of venomous arachnid envenomations.

The venom of Brazilian Wandering Spiders is a complex mixture of neurotoxins, cytotoxins, and enzymes. It contains various components, including PhTx3, which is a potent neurotoxin affecting the nervous system.

Brazilian Wandering Spider bites can have a range of effects on the human body, including intense pain, muscle cramps, fever, nausea, and in severe cases, paralysis. The severity of the symptoms depends on factors such as the amount of venom injected and the individual’s sensitivity to the venom. There are several types of spider bites .

Symptoms of a Brazilian Wandering Spider Bite

Local symptoms

• Intense pain
• Itching or burning sensation
• Formation of blisters or lesions

Systemic symptoms

• Muscle cramps and spasms
• Abdominal pain
• Nausea and vomiting
• Elevated heart rate
• Hypertension (high blood pressure)
• Respiratory distress

Severity and variations

The severity of Brazilian Wandering Spider bite symptoms can vary widely. In some cases, symptoms may be mild and resolve on their own, while in severe envenomations, life-threatening complications can occur. Individual reactions to the venom can also vary, making it challenging to predict the exact outcome of a bite.

First Aid and Immediate Response

Steps to take after a bite

Immediate response to a Brazilian Wandering Spider bite should include:

• – Washing the bite area with soap and water.
• – Applying a clean, cool compress to reduce pain and swelling.
• – Immobilizing the affected limb or area.
• – Keeping the bite victim calm to prevent an elevated heart rate.

Do’s and don’ts in case of a bite

• – Seek medical attention promptly.
• – Take note of the spider’s appearance (if possible) to aid identification.
• – Keep the bite victim still and calm to reduce the spread of venom.
• – Do not try to suck out venom or make incisions at the bite site.
• – Avoid applying tourniquets.
• – Don’t use ice directly on the skin as it can worsen tissue damage.

Seeking medical attention

Medical attention is essential after a Brazilian Wandering Spider bite, even if symptoms appear mild initially. Antivenom is available and can be administered to counteract the effects of the venom. Medical professionals can also manage symptoms and monitor for potential complications.

Complications and Long-Term Effects

Potential complications

Complications from Brazilian Wandering Spider bites can include:

• – Severe muscle spasms
• – Respiratory distress
• – Cardiovascular issues
• – Kidney failure (rare)
• – Allergic reactions to antivenom

Long-term consequences

Long-term consequences of a bite can vary depending on the severity and medical treatment received. Some individuals may experience lingering pain, muscle weakness, or psychological trauma following a severe envenomation.

Recovery and rehabilitation

Recovery from a Brazilian Wandering Spider bite typically involves medical treatment, rehabilitation for muscle and nerve damage, and psychological support for individuals affected by the experience. Rehabilitation may include physical therapy to regain muscle strength and function. Prompt medical attention and appropriate care are crucial for minimizing long-term effects and complications.

Facts of Brazilian Wanding Spider

Here are 10 creepy crawly facts about the Brazilian Wandering Spider:

• Big and Hairy:  These spiders are giants! Their bodies can grow up to 2 inches (5 centimeters) long, with a leg span of up to 7 inches (18 cm). They are covered in hairs, making them appear even bigger.
• Wanderlust:  They are aptly named – Brazilian wandering spiders don’t spin webs. Instead, they wander the forest floor at night in search of prey.
• Venomous Bite:  Their venom is considered one of the most potent among spiders. A bite can cause severe pain, swelling, sweating, nausea, and even priapism in males. Thankfully, bites are rare as they are typically shy and defensive.
• Not So Fond of Bananas:  While sometimes called ‘banana spiders,’ they are not typically found in bananas. They might, however, take shelter in them during transport, which is how they might end up in a faraway land.
• Rainforest Resident:  These spiders are native to the rainforests of South America, particularly in Brazil.
• Fearsome Feasters:  They’re active hunters and will eat almost anything they can overpower, including insects, lizards, frogs, and even small rodents.
• Mom’s the Word:  Female Brazilian wandering spiders are dedicated mothers. They lay hundreds of eggs in a silken sac and fiercely guard them until they hatch.
• Multiple Molts:  Like all spiders, Brazilian wandering spiders grow through molting. They shed their exoskeleton multiple times as they grow into adults.
• Mating Dance:  Male Brazilian wandering spiders perform a elaborate mating dance to attract a female.
• Medicinal Potential:  Despite their scary reputation, the venom of the Brazilian wandering spider is being studied for its potential use in treating erectile dysfunction.

What happens if a Brazilian Wandering Spider bites a man?

A Brazilian Wandering Spider bite on a man can cause a range of symptoms, some severe:

• Pain:  The bite is known for causing intense, localized pain at the site.
• Autonomic effects:  Sweating, nausea, and increased heart rate are common.
• Priapism:  In some cases, males may experience a prolonged and painful erection (priapism). This is due to a component in the venom.
• Muscle paralysis:  Severe bites can lead to muscle paralysis, which can affect breathing in rare cases.

However, it’s important to remember:

• Bites are uncommon as these spiders are typically shy and defensive.
• Antivenom is available and effective in treating bites.

If bitten, seek medical attention immediately. Early treatment can help prevent complications and ensure a full recovery.

How poisonous is a Brazilian Wandering Spider?

Brazilian Wandering Spider packs a nasty venomous punch, considered one of the strongest among spiders. Bites are rare though, as they’re shy and prefer to escape trouble.

What is the world’s deadliest spider?

The term “deadliest” can be subjective and depends on how one defines it (e.g., based on venom potency or human fatalities). However, the Brazilian Wandering Spider (Phoneutria) is often considered one of the most venomous spiders in the world. Another spider often mentioned in discussions of venom toxicity is the Sydney Funnel-web Spider (Atrax robustus and Atrax formosus), found in Australia. These spiders are known for their potent venom and have caused fatalities in the past.

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• June 9, 2023

Jumping Spider Egg Sac: A Deep Insight into Spider Reproduction

Mavra Sheikh

Jumping spiders are fascinating creatures of the family Salticidae, known for their exceptional jumping ability and keen eyesight. With over 6,000 species worldwide, jumping spiders are renowned for their unique characteristics and captivating behaviors. In this article, we will delve into the intriguing world of jumping spiders and shed light on the importance of jumping spider egg sacs.

Table of Contents

Jumping Spiders and Their Unique Characteristics

Jumping spiders are tiny to medium-sized arachnids, typically measuring around 4 to 20 millimeters. One of their distinctive features is their remarkable vision, with a pair of large, forward-facing eyes that provide excellent depth perception. This visual acuity enables jumping spiders to gauge distances accurately and plan their jumps.

Another fascinating characteristic of jumping spiders is their agility and leaping prowess. These graceful creatures can jump several times their body length, allowing them to capture prey or escape from potential threats swiftly. Their muscular legs and specialized silk-producing glands contribute to their impressive jumping abilities.

Introduction to Jumping Spider Egg Sacs and Their Importance

Jumping spider egg sacs play a crucial role in the reproductive cycle of these arachnids. Female jumping spiders carefully construct and protect these sacs, a haven for their developing eggs. The sacs are meticulously woven using silk produced by specialized spinnerets at the rear of the spider’s abdomen.

These egg sacs are essential to safeguard the spider’s offspring from external dangers such as predators and harsh environmental conditions. The silk material of the sac provides a protective barrier, shielding the eggs from potential harm. The sacs also help maintain optimal conditions for the eggs’ development, ensuring their survival and subsequent hatching.

Jumping spider egg sacs are notable for their variety in appearance and placement. Some species attach their egg sacs to plant leaves or bark, while others construct them within crevices or caves. The diverse range of egg sac designs and locations reflects the adaptability of jumping spiders to various habitats and their ability to protect their offspring effectively.

Jumping spiders are remarkable creatures with exceptional jumping abilities and acute vision. Their egg sacs, carefully constructed by female spiders, serve as vital incubators for their developing eggs, ensuring their safety and providing them with optimal conditions for growth. Understanding the importance of jumping spider egg sacs contributes to our broader knowledge of these fascinating arachnids and highlights the intricate mechanisms of their reproductive strategies.

Anatomy and Formation of Jumping Spider Egg Sac

The jumping spider egg sac is a remarkable architectural creation, carefully constructed by female spiders using silk-producing spinnerets. These sacs come in various shapes and sizes, ranging from spherical to elongated or flask-like structures. The silk material in their construction provides strength and flexibility, allowing the sacs to withstand external pressures and potential threats.

Inside the egg sac, individual compartments are formed, each containing a single egg. Silk partitions typically separate these compartments, ensuring the eggs are kept separate and protected. The silk walls of the egg sac act as a barrier, safeguarding the eggs from predators and unfavorable environmental conditions.

The Process of Egg Sac Production by Female Jumping Spiders

The production of an egg sac begins with the female jumping spider’s preparation of a suitable location. Once she has selected a secure spot, she starts by spinning a foundation thread, which serves as the base for the sac. This foundation thread provides stability and allows the spider to anchor the sac securely.

The female spider carefully weaves multiple silk layers using her spinnerets, gradually forming the sac’s structure. The spider meticulously reinforces the walls and partitions, ensuring the integrity of the sac. The silk material is produced by the spider’s silk glands and extruded through the spinnerets in a controlled manner.

Factors Influencing the Formation and Development of Egg Sacs

Several factors influence the formation and development of jumping spider egg sacs. Environmental conditions play a significant role, as the female spider seeks a suitable location that provides optimal temperature, humidity, and protection. The availability of prey and resources in the vicinity also influences the decision-making process of the female spider when selecting a site for egg sac construction.

Additionally, the reproductive state of the female spider and her physical condition can impact the formation of egg sacs. A well-nourished and healthy female spider is more likely to produce a robust and well-constructed sac. The readiness of the female’s reproductive system and hormonal factors also contribute to the timing and quality of egg sac production.

Functions and Significance of Jumping Spider Egg Sac

1: protection and camouflage of eggs within the sac.

One of the primary functions of the jumping spider egg sac is to provide protection and camouflage for the eggs within. The silk material of the sac acts as a physical barrier, shielding the eggs from potential predators such as insects, birds, and other spiders. The sac’s structure and colouration often blend seamlessly with the surroundings, making it difficult for predators to detect and access the eggs.

2: Role of Egg Sac in Maintaining Optimal Conditions for Egg Development

The egg sac is vital in maintaining optimal conditions for developing spider eggs. The silk material of the sac acts as an insulator, regulating the temperature and humidity levels within. This controlled microenvironment ensures that the eggs are exposed to favorable conditions necessary for proper embryonic development.

Furthermore, the egg sac provides a stable and secure environment, reducing the risk of desiccation or excessive moisture that could harm the developing eggs. The silk partitions within the sac also prevent eggs from sticking together, allowing each egg to develop independently without interference.

3: Importance of the Egg Sac in the Survival and Reproduction of Jumping Spiders

The egg sac is paramount for jumping spiders’ survival and reproduction. By providing a protected space for the eggs, the sac increases the chances of successful hatching and survival of spiderlings. The female spider invests significant energy and resources into the construction of the sac, ensuring the continuity of her lineage.

Moreover, the egg sac allows female spiders to produce and safeguard a more significant number of eggs compared to other reproductive strategies. This increased reproductive output enhances the population potential of jumping spiders, contributing to their success and ability to thrive in various habitats.

Jumping spider egg sacs’ anatomy and formation reveal female spiders’ intricate and purposeful construction. These sacs serve multiple functions, including protection and camouflage of eggs, maintaining optimal conditions for egg development, and ensuring the survival and reproduction of jumping spiders. Understanding these aspects sheds light on these fascinating arachnids’ remarkable adaptations and reproductive strategies.

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Life Cycle of Jumping Spider Egg Sac

1: duration of egg incubation period.

The duration of the egg incubation period in jumping spiders can vary depending on several factors, such as species, environmental conditions, and temperature. The eggs incubate within the sac for two to four weeks. During this time, the developing spider embryos undergo various stages of growth and development within their protective enclosures.

2: Hatching and Emergence of Spiderlings from the Egg Sac

The spiderlings are ready to hatch from the egg sac when the incubation period is complete. They use specialized structures, such as a small set of jaws called chelicerae, to break through the silk barrier of the sac. Once they emerge, the spiderlings may remain close to the sac briefly, often exhibiting gregarious behavior.

3: Behavior and Survival Strategies of Spiderlings After Hatching

After hatching, the spiderlings embark on a journey to explore their surroundings. They disperse from the egg sac, using their instincts to navigate and find suitable microhabitats. Spiderlings can produce silk threads from an early age, which they use for various purposes, such as building retreats or creating draglines for safety.

Spiderlings display unique behaviors and survival strategies to increase their chances of survival. They are adept at hunting small prey, often relying on their incredible agility and precise jumping abilities. Despite their small size, spiderlings possess venomous fangs, enabling them to subdue and consume their prey.

To avoid predation, spiderlings may employ camouflage techniques, blending with their surroundings to become less conspicuous. Some species exhibit behaviors like mimicry, imitating the appearance of ants or other unrelated arthropods to deter potential predators. These adaptive strategies enhance their chances of survival during the vulnerable early stages of life.

Ecological Impact of Jumping Spider Egg Sac

1: contribution of jumping spiders to pest control in ecosystems.

Jumping spiders play a significant role in pest control within ecosystems. They are voracious predators, targeting various insects and other arthropods. By preying on pest species, jumping spiders help regulate their populations, reducing the need for chemical pesticides in agricultural and natural systems. Their presence contributes to the ecological balance and promotes sustainable pest management practices.

2: Role of Egg Sacs in Maintaining Population Levels of Jumping Spiders

The egg sacs of jumping spiders play a crucial role in maintaining population levels. These sacs protect and house the developing spider embryos, ensuring a higher survival rate than species that do not utilize egg sacs. The successful hatching of spiderlings from the sacs replenishes the population, compensating for natural mortality and ensuring the continuity of the species.

3: Interactions and Relationships between Jumping Spider Egg Sacs and Other Organisms

Jumping spider egg sacs can have complex interactions and relationships with other organisms in their environment. In some cases, parasites or predators may target the sacs, attempting to exploit them as a resource. Certain wasp species, for example, may parasitize the spider egg sacs, laying their eggs inside and using them as a host for their developing offspring.

On the other hand, egg sacs can also serve as a food source for some specialized predators or scavengers. For instance, certain ants or beetles may opportunistically consume or feed on the silk material of the sacs.

Conclusion 

In conclusion, jumping spider egg sacs serve as protective fortresses, shielding the developing spider embryos from predators. The silk walls of the sac provide a barrier of strength and flexibility, while the partitions inside maintain the integrity of each egg.

Beyond their protective role, egg sacs create optimal egg development conditions. The controlled microenvironment within the sac, regulated by the silk material, ensures suitable temperature and humidity levels, enhancing the chances of successful hatching and healthy spiderling emergence.

Jumping spider egg sacs also shed light on these arachnids’ fascinating behaviors and strategies. The careful selection of nesting sites and the meticulous construction process showcase the female spider’s dedication to ensuring the survival of her offspring. Additionally, the variety in egg sac shapes and placements reflects the adaptability of jumping spiders to diverse habitats.

Understanding the importance of jumping spider egg sacs is fascinating and crucial for their conservation. By recognizing their challenges, supporting scientific research, and implementing conservation measures, we can protect these unique structures and the jumping spiders that rely on them.

In the intricate world of jumping spiders, the egg sacs stand as testaments to the ingenuity and resilience of these remarkable creatures. Exploring the mysteries of their formation, function, and significance brings us closer to appreciating the intricate web of life within the fascinating realm of arachnids.

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17 surprising facts about brazilian wandering spider.

Written by Regine Thomsen

Modified & Updated: 05 Mar 2024

Reviewed by Jessica Corbett

The Brazilian Wandering Spider, also known as the banana spider, is a fascinating and enigmatic creature that hails from the tropical forests of South America. With its vibrant colors, impressive size, and potent venom, this spider has earned a notorious reputation as one of the most dangerous arachnids in the world.

In this article, we will delve into the intriguing world of the Brazilian Wandering Spider and uncover 17 surprising facts about this captivating creature. From its unique hunting techniques to its bizarre reproductive behavior, these facts will shed light on the mysterious nature of this spider and challenge any preconceived notions you may have about them.

Whether you have a fear of spiders or simply have an interest in the wonders of the animal kingdom, prepare to be amazed and astounded as we explore the remarkable features and habits of the Brazilian Wandering Spider.

Key Takeaways:

• The Brazilian Wandering Spider is a venomous nocturnal hunter with unique mating rituals and a surprising nickname, “Banana Spider,” due to its occasional presence in banana shipments.
• Its potent neurotoxic venom can cause painful erections in humans and requires prompt medical attention, but antivenom is available for treatment in areas where the spider is prevalent.

The Brazilian Wandering Spider is one of the most venomous spiders in the world.

With its potent neurotoxic venom, the Brazilian Wandering Spider poses a significant threat to humans and animals alike.

It is found in various parts of South America, including Brazil, Venezuela, and Suriname.

The Brazilian Wandering Spider is native to the rainforests of South America and has adapted to diverse habitats within the region.

Male Brazilian Wandering Spiders have unique leg flaps.

Unlike other spiders, male Brazilian Wandering Spiders have specialized leg flaps that they use to attract females during courtship rituals.

Female Brazilian Wandering Spiders are larger than males.

The females of this species can grow up to 5 inches in leg span, while males are usually smaller, measuring around 3 inches.

They are known for their distinctive hunting behavior.

The Brazilian Wandering Spider does not build a traditional web to catch prey. Instead, it actively hunts for insects, small rodents, and even lizards.

The venom of the Brazilian Wandering Spider can cause painful erections in humans.

A bite from this spider can lead to a condition called priapism, which is characterized by prolonged and painful erections in men.

This spider is also known as the Banana Spider.

The Brazilian Wandering Spider earned its nickname “Banana Spider” due to its occasional presence in banana shipments, causing concerns for importers and consumers.

The Brazilian Wandering Spider has a defensive display known as “threat posture”.

When threatened, this spider raises its front legs, exposing its fangs and warning potential predators of its venomous capabilities.

They possess a potent venom that affects the nervous system.

The neurotoxic venom of the Brazilian Wandering Spider causes symptoms such as severe pain, muscle spasms, respiratory distress, and in rare cases, even death.

Antivenom exists for the treatment of Brazilian Wandering Spider bites.

In areas where the spider is prevalent, antivenom is available to counteract the effects of its potent venom. Prompt medical attention is crucial in these cases.

Brazilian Wandering Spiders have excellent eyesight.

With their eight eyes, these spiders have keen vision and can detect movement from a considerable distance.

They are nocturnal creatures.

The Brazilian Wandering Spider is primarily active during the night, using its superior vision and hunting skills to locate prey.

These spiders can deliver multiple bites in a single attack.

When threatened, the Brazilian Wandering Spider may repeatedly bite its target, increasing the dosage of venom injected into the victim.

Brazilian Wandering Spiders are known to be highly aggressive.

When disturbed or cornered, these spiders are quick to display defensive behavior and may attack without hesitation.

They have bristly hairs on their bodies, known as urticating hairs.

The Brazilian Wandering Spider possesses specialized hairs on its abdomen that can cause irritation and discomfort when they come into contact with the skin.

The Brazilian Wandering Spider is a member of the Ctenidae family.

Belonging to the Ctenidae family, which includes other wandering spiders, the Brazilian Wandering Spider is notable for its unique characteristics.

Female Brazilian Wandering Spiders protect their egg sacs diligently.

After laying their eggs, female Brazilian Wandering Spiders guard their egg sacs fiercely to ensure the survival of their offspring.

The Brazilian Wandering Spider is undoubtedly one of the most fascinating creatures in the animal kingdom. Their unique characteristics and behaviors make them a subject of both awe and fear. From their lethal venom to their uncanny ability to wander into unexpected places, these spiders have managed to capture the attention of researchers and enthusiasts alike.

Understanding the 17 surprising facts about the Brazilian Wandering Spider gives us a glimpse into their world and highlights their significance in the ecosystem. From their impressive hunting techniques to their role as both predator and prey, these spiders play a vital role in maintaining the balance of nature.

While encountering a Brazilian Wandering Spider in the wild might be a rarity for many, it’s important to respect these creatures and appreciate their beauty from a safe distance. By learning more about them, we can cultivate a greater understanding and appreciation for the diverse and awe-inspiring world of animals.

Q: Are Brazilian Wandering Spiders really dangerous?

A: Yes, they are. Brazilian Wandering Spiders are considered one of the most venomous spiders in the world. Their bite can be fatal if not treated promptly.

Q: Where are Brazilian Wandering Spiders found?

A: These spiders are native to various regions in South America , including Brazil, Ecuador, and Peru.

Q: How big do Brazilian Wandering Spiders get?

A: Adult Brazilian Wandering Spiders can have a leg span of up to 6 inches, making them one of the largest spiders in the world.

Q: What do Brazilian Wandering Spiders eat?

A: They primarily feed on insects, but they have also been known to eat small reptiles and amphibians.

Q: Are Brazilian Wandering Spiders aggressive?

A: Brazilian Wandering Spiders can exhibit aggressive behavior if they feel threatened. It’s important to exercise caution and avoid provoking them.

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What Are Garden Spiders Anyways? All About Common Garden Spiders

One of the least favourite species on the planet, spiders oftentimes get a bad rap. But when you look past their alien-like bodies and spider bite lore, they’re actually an incredible pal to have out in the garden. Here’s the lowdown on garden spiders and some common types you might spot in your backyard.

I know how squeamish people can get about spiders. I’ll be the first to admit that I won’t be volunteering to hold a tarantula anytime soon, but I do love my garden spiders!

Movies like Spiderman have people believing that spiders should be something to be feared. In fact, they’re relatively harmless and are much less of a nuisance than pests like mosquitoes , aphids , or whitefly.

I’ll happily invite spiders to hang out in my garden anytime. A natural predator , they’re one of the good guys in the ecosystem. Just ignore their not-so-cute exterior!

That all being said, if you’re squeamish about spiders, note that there will be plenty of close-up photos on this page of the 8-legged friends.

This post will cover…

Garden Spiders 101

Spider lifecycle, common garden spiders, are garden spiders bad, how to make your garden more spider friendly, how to keep garden spiders out of the house, frequently asked questions about garden spiders, more beneficial garden insects.

In the garden, you can find either web-building spiders or wandering spiders. As you can imagine, web-building spiders build webs to capture prey . Each web will look different and is specific to the type of spider.

A spider’s web is one of the strongest natural materials found on earth. Stronger than steel, it can handle a load more than a hundred times its size. Some dismantle their webs and rebuild them every day while others leave them up. Without a doubt, spider webs are one of the prettiest sights to see on a dewy morning or a frosty fall day!

Wandering spiders, also known as cursorial or hunting spiders, don’t construct webs and actively pursue prey or sit and wait for it to come nearby.

When a female and male spider mate, the female will actually take the sperm and store it until it’s ready to lay the eggs. The male spider will die shortly after mating while the female spider will make an egg sac out of the silk and deposit her eggs inside , fertilizing them as it goes. Depending on the spider, one egg sac can contain but a few eggs or hundreds.

It will take a few weeks to hatch. Oftentimes, the mother guards the eggs. She will die shortly after the first frost following mating.

When spiders hatch, they’re known as spiderlings. They use their silk to help spread and get away from the egg sac. The spiderlings will molt 5-10 times before they’re considered an adult.

Most spider eggs hatch when the weather is warm in the spring , but some spider species will hatch in the fall.

With around 3000 spiders found in North America alone, there are so many spiders you might find in your local area. But here are some of the most common!

• Yellow Garden Spider: identified by their black and yellow abdomen (female only). Found in US and southern Canada.
• Wolf Spiders : known for carrying their egg sac with them, they have large and dark bodies that blend into their environment. Found in most areas of the world.
• Grass Spider: identified by their long legs, brown bodies, and the two dark bands along the abdomen. Common in North America.
• Cross Orbweaver: known for their reddish brown to medium brown bodies with white dots and lines on their abdomen. Originally from western Europe but transported to North America.

• Goldenrod Crab Spider: light yellow in colour, they have two signature red stripes on their abdomen. The males front legs and front cephalothorax are reddish black. Found in North America.
• Banded Garden Spider: a type of orbweaver spider, known for their striped bodies of yellow, white, brows, and black. Found everywhere in the world.
• Common House Spider : brown and tan in colour with black and white patches. Found in North America.

Nope! Spiders are more than just good, they’re amazing friends to have out in the garden ! I know they often get a bad rap due to their spindly legs and tiny pincers, but more often than not, they stick to the garden and leave us humans alone.

A healthy population of spiders indicates that there is a healthy population of other insects in the garden. As one of the top predators, they’re part of the natural balance of life in your garden. They help to control those annoying or bad bugs such as aphids, mites, caterpillars, squash bugs, cabbage moths, and more.

Most garden spiders are considered non-aggressive and aren’t likely to bite . If they do bite, they’re relatively harmless and act like normal bug bites.

Now that you know how lovely spiders are, you may just want to invite more to your garden party! Spiders are attracted to hiding spots like wood, rocks, and compost. They also like spaces to build their webs like fences, hedges, and tall bushes.

Some spiders like woody and dense areas amongst your shrubs and perennials while others like to lounge in the sun and the grass. What most spiders can agree on is that they prefer to build webs in protected areas to keep them safe from harsh winds.

Avoid using any kind of insecticide in your garden . They kill off the population of insects that spiders like to munch on or even the spiders themselves. Consider natural methods of pest control if you have a pest problem. A good method is to invite all kinds of good predators into your yard!

Above all, leave them alone ! It can be tempting to knock down their webs and their egg sacs, but just remember how beneficial they are for the garden. Come winter, they won’t be around any longer so let them have their fun now!

While I love my spiders outside, I’m not the biggest fan of them inside the house…especially when there are tons! Spiders like to find their way inside when the temperatures begin to drop . You’ll likely see spiders taking refuge in your home, garage, shed, and crawl spaces.

You’ll want to make sure they have no way of getting in. This means sealing all window and door seals and fixing any cracks that they could squeeze through.

Also, consider the locations they like to hang out in. For instance, it’s best to keep any bushes and shrubs away from the home if you’re having a garden spider problem.

Doing a spring cleaning when spider eggs begin to hatch is another good idea. Make sure to check all the forgotten places like behind furniture, above door frames, and corners to eliminate eggs sacs and other insects they may like to eat.

Yes, most garden spiders bite but it’s unlikely that they will. Most spiders would rather run away rather than bite you . These are considered non-aggressive spiders. They may bite a human or pet if they’re feeling threatened or disturbed. The bite is similar or less painful than a bee sting. It can cause itching, swelling, and redness but most people won’t even notice a spider bite.  

Typically, most spiders live to be about a year old. Males will die shortly after mating while females die after the first frost after mating. Since most female spiders protect the egg sacs before they hatch, they live longer. Some females may even survive the frost and live a few additional years.

If you have any other questions about garden spiders, please leave them in the comments down below.

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Thanks for this on spiders. I had a “pet” on my sun porch named and storied who I called Alfred. I am going to send you my story if possible. I really enjoyed his company and not sure he survived the winter here in Milwaukee. I really enjoy your site/blog/reports/whatever it’s called here online. Stay well and safe.

I loved this spider piece all over again and must tell you that I had another “pet” spider on the outside of the porch. Named him Sylvester because it just seemed to fit his personality. A coupla of dried leaveas clung to the house and he used them as his hideway. I really enjoyed chatting with him but as soon as it got cold, Sylvester was gone. Hoping for another spider friend come summer.

I love this so much, Nancy. I hope you get another spider friend too!

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Spider Research

Department of Entomology

Deadly Banana Spiders !!!!!!!!!  Or not

Updated 3 aug 2015.

Every once in a while in North America, a large spider (or a spider egg sac) is found in international cargo, most commonly in bananas.  The spider is collected and taken to a local “authority” who typically has no arachnological experience. A quick search of the Internet leads the “authority” to identify the spider as a deadly armed or wandering spider of Brazil (genus  Phoneutria ) and then, panic and hyperbolic media coverage ensues.  However, most of the time, these incidents are misidentifications of harmless spiders.  This is due in part to the dynamic nature of being associated with a potential dangerous animal.  People like to jump to the exciting conclusion that they are dealing with a “deadly” creature.  Another contributor to the hyperbole is that a quick identification is understandably forced by a desire to know if the spider is indeed dangerous so that cargo crews will not suffer envenomations and cargo can then be unloaded before it decays (in the case of fruit).  People then err on the side of the fantastic rather than caution. 

Information regarding spiders collected from bananas can be found in the two articles below, which can be obtained from me in PDF form with an email request.   [email protected]

Vetter, R.S. and S. Hillebrecht.  2008. On distinguishing two often-misidentified genera ( Cupiennius ,  Phoneutria ) (Araneae: Ctenidae) of large spiders found in Central and South American cargo shipments. American Entomologist 54: 82-87.

Vetter, R. S., R. L. Crawford and D. J. Buckle. 2014. Spiders (Araneae) found in bananas and other international cargo submitted to North American arachnologists for identification. Journal of Medical Entomology 51: 1136-1143.

Information on spider egg sacs found on bananas is also presented below but read through the information on the spiders first

Armed spiders (Genus  Phoneutria )

Spiders of the genus  Phoneutria  cause the greatest concern. Typically, harmless spiders are misidentified as  Phoneutria  spiders when intercepted in cargo.  The reason for this misidentification is the well-known fact that some species of  Phoneutria  have red hairs on their chelicerae (the two structures below the eyes on the “face” which have fangs at the end). Unfortunately, these are not the only large spiders found in bananas that have these red hairs. Because almost no one in North America has the proper identification publications for South American spiders, they turn to either the Internet (where the spiders are often already misidentified) or the Golden Guide to Spiders, a very rudimentary identification guide. 

The dangers associated with these spiders for North Americans are very much overexaggerated.  First, the most cited dangerous species is  Phoneutria fera .  This is actually an Amazonian species, (i.e., it lives in the Brazilian Amazon) far from areas of human commerce and the Brazilian banana plantations and, therefore, they don’t have the opportunity to be transported in cargo, or at least are highly unlikely to be so moved.  In Germany from decades ago, specimens listed as imported  P. fera  were most likely misidentified specimens of other  Phoneutria  species.  (One must also keep in mind that  Phoneutria  taxonomy has been a nightmare for the last century with new species being named and other names being absorbed by other existing species, back and forth almost like an Abbott and Costello comedy routine.  It is really difficult sometimes to pin down a name because for some spider groups, the taxonomy is not yet settled).  The spiders intercepted in Germany were most likely specimens of  P. nigriventer  and  P. keyserlingi , which are only found on the Atlantic coast of Brazil and are mostly involved in Brazilian envenomations.  All three of these spiders can get up to 50 mm in body length.  However, they still are not nearly as deadly as people claim.  In one study of 422  Phoneutria  bites in coastal Brazil, only 2.3% of the victims required antivenom and the only death was one small child. Although there is an obvious major concern when children are bitten, most bite victims experienced minor problems without long-lasting effects and certainly not death. Most of the bites were in adults; minor symptoms resolved without complications.

Although these large spiders were transported in bananas to Europe many years ago, currently, Brazil consumes almost all of its banana crop domestically so now there is less chance for the spiders to be transported out of the country, at least in fruit.

On the west coast of South America, another species,  P. boliviensis , exists and has occasionally been transported in cargo to North America (mostly from Ecuador).  However, in comparison to its eastern relatives, this species is smaller (30 mm body length) and its envenomation effects are milder.  A paper on bites in plantation workers revealed annoying symptoms but no deaths.  Workers missed 2 to 3 days of work.  So even if these spiders were transported to North America, they are not considered very dangerous and should not cause concern.

To summarize:

• The dangerous species of  Phoneutria  are found in the Amazon where interaction with people is rare and transport out of the country in commerce is highly unlikely. 
• The two species associated with high human population on the eastern Brazilian coast cause human envenomations but are not as dangerous as they are reported to be.  Although they can cause death in young children, most bite victims experience mild reactions.
• Brazil no longer exports much of their banana crop.
• The western South American species of  Phoneutria  is much smaller than the eastern species and although sometimes is transported, it is not a major medical concern when bites occur.
• All  Phoneutria  species are virtually restricted to South America.  If a spider is found in a banana shipment from Central America, then it is highly unlikely to be a  Phoneutria  spider (see next section)

Cupiennius  spiders

These are the spiders that are most frequently mistaken as  Phoneutria  spiders.  They are large, found in banana shipments and one species,  Cupiennius chiapanensis , has bright red hairs on its chelicerae.  One major contributing factor to the confusion is that  C. chiapanensis  was only officially described in 2006 so only a few arachnologists in Central America were aware of this spider. There are other species,  C. getazi , and  C. coccineus,  which have sometimes been transported to North America in bananas.  The large species of  Cupiennius,  which are most frequently found in banana shipments in North America, live exclusively in Central America.  They have characteristic coloration:

Cupiennius chiapanensis - bright red hairs on chelicerae

Cupiennius getazi - underside of legs near body has black dots on white background

Cupiennius coccineus -   underside of front legs near body has bright red hairs

Cupiennius getazi

However, because  C. chiapanensis  has bright red hairs on the chelicerae and was only recently described, almost no sources have accurate information on this spider.  Hence, it looks closest to  Phoneutria fera  and then the hysteria starts.  I am aware of 6 cases where a North American arachnologist (including myself) as well as several Mexican authors made misidentifications, most of which came before 2006.  No species of  Cupiennius  spider is considered dangerous and verified bites result in mild pain for a short time with no long-lasting effects. 

• Cupiennius  spiders are often found in banana shipments to North America but are harmless.
• Cupiennius  spiders are virtually restricted to Central America or at least the ones that end up in banana shipments come only from Central America.
• Cupiennius chiapanensis  has only been officially known since 2006 and is frequently mistaken as the potentially dangerous  Phoneutria fera , even by experienced arachnologists because both spider species have red hairs on their chelicerae.

Huntsman spider,  Heteropoda venatoria

This spider is established worldwide in tropical areas including Hawaii and Florida.  It is frequently found in cargo shipments of all kinds and in bananas is common from Ecuador.  It has a white “moustache” under its eyes and holds it legs rotated to the side like a crab.  The males and females have strikingly different coloration. These spiders are harmless.

Summary for the entire page so far

• If you have a large spider found in bananas from a country in Central America, it is most probably going to be a harmless species of the genus  Cupiennius .
• If you have a large spider found in bananas from western South America (i.e., Ecuador), if it has a white moustache, it is the harmless huntsman spider,  Heteropoda venatoria.    If large but with no moustache, possibly it is  Phoneutria boliviensis,  which is of minor medical concern but could also be one of several other non-related species.
• You can’t use the red facial hairs alone to accurately identify a large spider found in bananas.
• None of these spiders are deadly.

Spider egg sacs found on bananas

 In the last few years, there have been more incidences of egg sacs found on bananas brought into North America.  Most of these are crushed during shipment but on occasion a few survive transport and babies can hatch out of them, causing panic in the home owner.  And once again, people who have no arachnological training immediately identify these egg sacs as the hyperbolically-dangerous  Phoneutria fera  spider.  First of all, the general public is notoriously bad in identifying spiders in bananas when comparing pictures.  Considering how there is almost nothing in the scientific literature on egg sacs of these spiders, it is really amazing that people are so assured that they have correctly identified the egg sac to one species of spider. 

In regard to this, I have personally seen 10 to 20 egg sacs from bananas, several with live spiderlings.  I was not successful in raising the babies; they wouldn’t eat anything that I offered them including each other and I have reared thousands of baby spiders of other species to adulthood in my career.  So people freak out because they fear that these spiders will establish in their homes, when I couldn’t get them to eat anything to get them to the next instar (stage between molts).

In addition, the egg sacs that I have been receiving have about 50 to 200 eggs inside. According to a paper in the  Journal of Arachnology ,  Phoneutria boliviensis , (the small  Phoneutria  spider) lays an average of 836 eggs in its egg sac with a range of 430 to 1300 eggs.  So the egg sacs that I have been receiving are much smaller than the smallest  Phoneutria  egg sac.  Also, from the spiderlings that I have examined, they look closest to a small harmless spider genus,  Acanthoctenus .  But because these spiders are so small and hard to identify, there is also the possibility that they are being laid by some other species that is never found in bananas so we have no idea what species it is. 

But the overall message here is that the egg sacs that have been coming through in bananas do not appear to be anything dangerous and the reports of  “deadly” banana spiderlings being found by home owners is just another case of misidentification and unwarranted media hyperbole.

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Spider eggs that caused UK family to flee home 'not of dangerous species'

Egg sack found in bunch of bananas that caused Warwickshire family to hole up in hotel did not belong to deadly Brazilian wandering spider, says supermarket

• Venomous spider found in shopping is “beautiful but aggressive”

Spider eggs discovered in a bunch of bananas, which it was feared belonged to one of the world’s deadliest arachnids, have been found to belong to a harmless species, according to the supermarket where the bananas were bought.

Keith Hobbs and wife Laura fled with their four children when told the egg sack probably belonged to Brazilian wandering spider, which can kill with its venomous bite and has legs up to 6in (15cm) long.

They found the cocoon at their home in Nuneaton, Warwickshire, on Thursday.

Keith Hobbs, 32, a deputy head teacher, told The Sun newspaper: “As soon as we knew what they were we just grabbed the kids, who were in their pyjamas, and ran out the house.

“We’ve spent the night in a hotel room. It’s terrifying – it’s like a bad dream.”

His parents-in-law bought them the bananas from an Aldi store in Hinckley, Leicestershire.

After Laura Hobbs opened the bag and found the nest, her husband called police and also contacted wildlife experts.

The Aldi shop was temporarily shut on Friday but reopened in the afternoon after no spiders were found.

Venom from the Brazilian wandering spider can kill a human in just two hours, with victims suffering nausea, hypothermia and convulsions.

Declared the most venomous spider in the world by the Guinness Book of Records, it is found in South and Central America. Its Greek name, Phoneutria , translates as “murderess”.

Rather than building a web to catch its prey, the spider hunts insects, small mammals and reptiles on the jungle floor.

An Aldi spokesman said: “The safety of our customers is our absolute no 1 priority and as such, the bananas in question were immediately removed from the store as a precautionary measure.

“Following independent expert analysis, we can confirm that the eggs in question were totally harmless and not from the Brazilian Wandering Spider ( Phoneutria fera ).

“Whilst our bananas are of the highest quality and delivered by one of the world’s largest suppliers, these incidents, whilst extremely rare, can occur and we apologise for the distress caused to Mr Hobbs and his family. The Watling Street store in Hinckley is now fully open to customers.”

The previous image on this article was changed on 6 June 2015 after a reader pointed out that it was not, in fact, a Brazilian wandering spider.

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