Are Spiny Orb Weaver Spiders Poisonous? Separating Fact from Fiction

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Spiny orb-weaver spiders are easily identifiable by their colorful and unique appearance.

They are part of the Araneidae family and are commonly found in gardens, where they spin intricate webs to catch their prey.

While these spiders might look intimidating due to their spiny appearance, it’s essential to determine whether they are actually poisonous or not.

These eye-catching spiders serve as a beneficial aspect of the ecosystem, as they help control various insect populations.

Are Spiny Orb Weaver Spiders Poisonous

They are typically not considered harmful to humans.

Although this topic might raise concerns for those who encounter these spiders, understanding their nature and venomous properties will put one’s mind at ease.

One of the well-known spiny orb-weaver spiders is the Gasteracantha cancriformis, which comes in a variety of colors and boasts a unique shape.

It is not considered to be dangerous to humans, as its venom is mild and not potent enough to cause severe harm.

Nonetheless, it’s essential to practice caution when coming into contact with any spider, as individual reactions may vary.

Spiny Orb Weaver Overview


Spiny orb weaver spiders belong to the family Araneidae and can be commonly found under the genus Gasteracantha.

Their unique physical characteristics make them stand out among other orb-weavers.


The spiny orb weaver’s most distinctive feature is its spiny, hard abdomen, which often comes in various colors like white, yellow, or orange.

They also have hairy legs and unique patterns on their abdomen, making them easily identifiable.

Spiny Orb Weavers vs. Banana Spiders

FeatureSpiny Orb WeaversBanana Spiders
AbdomenSpiny, hard abdomen with colors ranging from white to yellow or orangeLarge, elongated, cylindrical, may display yellow, silver, black, and bright blue
SizeTypically smaller in sizeLarger, with longer legs
LegsHairy legsLong, smooth legs
HabitatFound on exterior light fixtures, in forests, or near forest edgesFound mostly in forests


Spiny orb-weaver spiders can be found in a variety of environments, from forests to near exterior light fixtures or forest edges.

They tend to create their webs in areas with varying levels of sunlight.


These spiders usually have a small to medium size. Their legs may vary in length, but the spiny abdomen ensures they maintain a visually striking appearance.

Biology and Behavior

Diet and Prey

Spiny orb weaver spiders primarily feed on small insects. Some examples of their prey include:

  • Flies
  • Mosquitoes
  • Moths

These spiders create circular webs to catch their prey, which they then paralyze before consuming.


Spiny orb weavers exhibit sexual dimorphism, meaning males and females are different in size and color.

For example, females are larger and brightly colored, whereas males are smaller and duller.

During reproduction, the female spider creates one or more egg sacs to protect her eggs.

The egg sacs are usually placed close to the web. After hatching, the spiderlings disperse to find their own habitat.

Diurnal and Nocturnal Activity

Spiny orb weaver spiders are both diurnal and nocturnal, meaning they are active during the day and night.

Their behavior can vary depending on environmental factors and the availability of prey.

Comparison Table:

Smaller in sizeLarger and brightly colored
Duller colorationVibrant colors

Overall, spiny orb weaver spiders are non-aggressive creatures that contribute to controlling insect pests in their environment.

Their striking appearance and fascinating biology make them an interesting subject for nature enthusiasts.

Are Spiny Orb Weaver Spiders Poisonous?

Are They Poisonous?

Spiny orb weaver spiders may appear menacing due to their unique appearance, but they are generally not considered dangerous to humans.

These spiders have venom, but it is relatively mild and typically causes minimal symptoms, much like a bee sting.

Comparing Venom with Other Spiders

When comparing spiny orb weaver venom to other spiders, the venom is significantly less toxic than that of the notorious black widow or brown recluse spiders.

Below is a comparison table of venom potency:

SpiderVenom Toxicity
Black WidowHigh
Brown RecluseHigh
Spiny Orb WeaverMild

Do Spiny Orb Weaver Spiders Bite?

Bite Symptoms and Treatment

A spiny orb weaver spider bite is rare and usually occurs when the spider feels threatened. When bitten by a spiny orb weaver, symptoms can include:

  • Pain
  • Swelling
  • Itchy welts

Treatment for a spiny orb weaver bite usually involves simple measures such as cleaning the bite area, applying ice to reduce swelling, and using over-the-counter pain relievers.

Risk to Pets

These spiders pose minimal risk to pets like dogs or cats. Generally, spiny orb weaver bites are not fatal, and symptoms are mild.

Benefits of Spiny Orb Weavers in Gardens

Spiny orb weavers can be beneficial for gardens by:

  • Preying on garden pests
  • Controlling insect populations
  • Providing natural pest control, reducing the need for chemical pesticides

These spiders create orb-shaped webs, capturing various insect species, making them helpful allies against common garden pests like flying insects, wasps, or even small frogs.

They are an essential part of the ecosystem and pose minimal risk to humans.

Pest Control Methods

Spiny orb weaver spiders are not aggressive and are considered beneficial for pest control.

They feed on various insects, playing a crucial role in maintaining a balanced ecosystem.

Let’s take a closer look at their diet and the ways they help in controlling pests.


  • Flies
  • Beetles
  • Moths
  • Mosquitoes
  • Other small insects

Their presence is especially prevalent along the southeast coast of the United States. By eliminating insects such as flies and mosquitoes, spiny orb weavers reduce the threat to humans and crops from these pests.

Spiny orb weaver spiders build their webs off the ground, often using sheltered areas and ground litter.

This behavior enables them to capture a diverse range of prey and maximizes their impact on pest populations.

However, hummingbirds may occasionally get caught in these webs, posing a potential threat to the birds.

But overall, spiny orb weavers do more good than harm in controlling insect populations.

Here’s a comparison table of the pros and cons of having spiny orb weaver spiders for pest control:

Effectively control insect pestsMay trap hummingbirds
Non-aggressive and not poisonous 
Contribute to a balanced ecosystem 

In conclusion, spiny orb weaver spiders are beneficial for pest control, as they help maintain the natural balance of ecosystems by feeding on flies, beetles, moths, mosquitoes, and other insects.


Spiny orb-weaver spiders are colorful spiders that have spines or horns on their backs.

They are not poisonous to humans, but they can deliver a painful bite if disturbed or handled.

Spiny orb-weaver spiders are found in warm and tropical regions, where they spin large and intricate webs to catch their prey.

They are harmless and helpful predators that control the population of insects and other pests.

Spiny orb-weaver spiders are unique and amazing creatures that deserve respect and admiration.


  • Bugman

    Bugman aka Daniel Marlos has been identifying bugs since 1999. 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 Dhir

    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.

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Tags: Orb Weaver Spiders

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3 Comments. Leave new

  • phyllis martin
    October 8, 2014 3:46 pm

    i am in decatur alabama i have never seen one of these before its the crablike orb weaver

  • I just returned from key west and think I brought home a hitchhiker. I don’t have picture, but was light brown in my laundry. Pretty big. Looked a cross between grasshopper and spider. Could not kill it. But caught it in a towel and threw outside. I live in CT. We stayed in a B and B in key west. Any ideas?



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