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Sac spider Protective mother
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Also called:
two-clawed hunting spider
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Sac spider
Sac spider Venomous yellow sac spider (Cheiracanthium inclusum).

sac spider

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

See also list of spiders

sac spider, (family Clubionidae), widespread family of nearly 700 species of nocturnal spiders. that build silken tubes, or sacs, under stones, in leaves, or in grass. Sac spiders range in body length from 3 to 15 mm (about 0.12 to 0.6 inch) and have eight eyes in two rows. The taxonomy of the group is contentious. Chiracanthium inclusum, found throughout the United States, is venomous to humans and is often found indoors. Its greenish white to cream-colored body is about 8 mm (0.3 inch) long. It is sometimes placed in the family Cheiracanthiidae, the yellow sac spiders.

Protective mother
Protective motherA female yellow sac spider (Cheiracanthium punctorium) guarding her offspring in a silk sac.
The Editors of Encyclopaedia BritannicaThis article was most recently revised and updated by Melissa Petruzzello.