Starbellied Orb-weaver (Acanthepeira stellata)

The Starbellied orb-weaver is a special spider from the Araneidae family. You can often see it in places like Mexico and Canada, especially between late spring and early fall. Ready to explore some amazing facts about this spider? Let’s dive in!

Physical Description and Identification

Adults

• Size: The females are 0.27 – 0.59 inches (7 mm – 15 mm) long, males are slightly smaller, with a body length of 0.19 – 0.31 inches (5 – 8 mm).

• Color: They have a brown body with shades varying from light to dark.
• Other Characteristic Features: They have ten to twelve points protruding from different parts of their abdomen resembling a star. Two of their eyes are also set on points.

Eggs

Their eggs are small and round, enclosed safely in a sac, emerging in summer.

Spiderlings

The spiderlings stay together for a while after hatching, eventually, they disperse to be on their own.

The Web

Like other orb weavers, these spiders too build wheel-shaped webs, spanning about 6 – 10 inches (15.24 – 25.4 cm).

Are Starbellied Orb-weaver Spiders Venomous?

Yes, Starbellied Orb-weaver Spiders do have venom. They use it mainly to catch and eat their prey.

Can Starbellied Orb-weaver Spiders Bite?

They can bite, but they usually keep to themselves. If they feel in danger, they might defend themselves, but they’re mostly peaceful.

Ecological Importance and Behavior of Starbellied Orb-weaver Spider

The Starbellied orb-weaver plays a pivotal ecological role. By feeding on a variety of insects such as beetles, moths, flies, and wasps, these spiders help control pest populations in meadows and grasslands, which is their preferred habitat. Their presence supports a healthy ecosystem, reducing the need for chemical pest control and promoting biodiversity.

Natural Predators: Despite their venomous bite, these spiders are not apex predators. They fall prey to birds, larger insects, and even other spiders. This vulnerability plays a significant part in the natural food web, as it keeps their population in balance.

Prey-Predator Dynamics: Starbellied orb-weavers have a classic predator-prey relationship with the insects they consume. Their venom paralyzes the prey, facilitating an easier meal and demonstrating a fine-tuned ecological balance where they serve as both predator and prey.

Relationship with Humans: The interaction between humans and Starbellied orb-weavers is minimal and generally harmless. They are not aggressive towards humans and bites are quite rare, occurring typically only in self-defense. Their role as natural pest controllers often makes them a welcome presence in gardens and farms.

Quick Facts

Did You Know

• The star-shaped pattern on their body, as mentioned above, earns them their name.

In summary, the Starbellied orb-weaver’s role extends far beyond its striking appearance.