A large family of spiders known as sac spiders or hunting spiders that build small silken sacs or tubes as retreats in vegetation and crevices.
From Greek 'klubion' (club, referring to club-shaped male sexual organs) plus '-idae' (taxonomic suffix for family). Named by arachnologists in the 19th century based on the distinctive morphology of male spiders.
These are actually common household spiders that many people have seen but didn't know were named for their club-shaped reproductive organs—it's a funny reminder that scientific names can be based on the most unglamorous anatomical details.
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