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Theridiidae Achaearanea sp.B

Order: Araneae

Family: Theridiidae (Cobweb spiders)

Genus: Achaearanea

Like all Theriidae, this spider has a comb of 6 to 10 slightly curved hairs on tarsus IV. Females have globular abdomens. This specimen is a male, and therefore has a thinner abdomen. Note the shoulder humps and white dots on this particular specmen. Unlike some spiders in this family, the males are only slightly smaller than the females. Females vary from 1.6 to 6 mm, and males from 1.2 to 4.7 mm.

Cobweb spiders build irregular webs with sticky outside threads to entangle prey. As the prey struggles, the spider pulls it into the web, throws silk over it, and kills it.

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Last updated 12/14/2004