A member of the spider family Clubionidae; a hunting spider that builds small silken retreats in vegetation.
From the family name 'Clubionidae' (derived from Greek 'klubion,' meaning club, referring to the club-like shape of male reproductive organs) plus '-id' (meaning 'member of that group').
These spiders have 'club' in their name because of their reproductive organs, not because they carry weapons—it's a perfect example of how scientists name organisms by their most distinguishing anatomical features, even if those features aren't the most obvious ones.
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