sac spider

arachnid
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Also known as: Clubionidae, two-clawed hunting spider
Also called:
two-clawed hunting spider

sac spider, (family Clubionidae), any member of a relatively common, widespread family of spiders (order Araneida) that range in body length from 3 to 15 mm (about 0.12 to 0.6 inch) and build silken tubes under stones, in leaves, or in grass. Chiracanthium inclusum, found throughout the United States, is venomous to humans and is often found indoors. Its greenish white to cream-coloured body is about 8 mm long.

This article was most recently revised and updated by Amy Tikkanen.