Banded Garden Spider

Media
banded or white backed garden spider in web
Scientific Name
Argiope trifasciata
Family
Araneidae (orb weavers) in the order Araneae (spiders)
Description

The female banded garden spider is similar to its close relative, the black-and-yellow garden spider. However, the banded garden spider is slightly smaller overall, with a pointier hind end. Also, the abdomen is patterned with many thin silver and yellow transverse lines and thicker black, spotty lines. The cephalothorax (head) is small and covered with silvery hairs. Males are smaller and thinner; they are usually only seen when courting or mating in the webs of females.

Common Name Synonyms
White-Backed Garden Spider
Garden Orbweaver
Size

Length (not including legs): ½ to 1 inch (females); to ¼ inch (males).

Where To Find
image of White-Backed Garden Spider Distribution Map

Statewide in appropriate habitats.

Webs are built in fairly open areas, such as in tall grasslands. Compared to the black-and-yellow garden spider, this orb weaver tends to position its web slightly lower in the vegetation. It also is less likely to be found in shade and is more tolerant of dry, open areas with sparse brush. Webs are large, wheel-shaped, and built vertically. This species, like others in the genus, builds a stabilimentum, a thick zigag of threads, at the center of the web.

This spider eats a variety of insects, including grasshoppers, cicadas, and katydids. Once an insect is caught in the sticky strands of the web, the spider often shakes the web to make the insect more fully ensnared. Then, the spider further subdues her prey by injecting it with venom and wrapping it securely in sheets of silk. Often the spider repairs the damaged parts of her web before returning to her prey.

The genus name, Argiope, is variously pronounced ar-GUY-o-pee, ar-GHEE-o-pee, or ar-JEE-o-pee. It is derived from the Latin word for silver, argentum, and refers to the silvery hairs that cover the carapace of many spiders in the genus.

Life Cycle

Young spiderlings hatch in spring and disperse by ballooning on strands of silk that catch the breeze. Once mature, they breed only once, with the much smaller male courting by plucking strands on the female’s web. All summer, the females eat insects and create kettledrum-shaped egg cases 3/4 inch in diameter that can contain over 1,000 eggs each. Egg cases are generally attached to nearby plants. As temperatures cool in autumn, the female slows and dies in the first frosts.

These spiders help control insect pests and are particularly appreciated by gardeners. Also, because of their colorful patterns, localized nature, remarkable web architecture, and easily observed behaviors, these spiders are excellent creatures for children and adults to watch.

In addition to their role as predators, these spiders, and their young and egg cases, often are eaten by birds, snakes, and even praying mantises. In winter, birds such as chickadees and titmice hunt for spider egg cases. The nice big sacs of this species would be a feast!

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About Land Invertebrates in Missouri
Invertebrates are animals without backbones, including earthworms, slugs, snails, and arthropods. Arthropods—invertebrates with “jointed legs” — are a group of invertebrates that includes crayfish, shrimp, millipedes, centipedes, mites, spiders, and insects. There may be as many as 10 million species of insects alive on earth today, and they probably constitute more than 90 percent all animal species.