From ZooTerms (Dictionary of Invertebrate Zoology)
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crochet also crotchet (noun; French crochet, small hook): 1. (Arthropoda: Insecta) In Lepidoptera and on other insect larvae, one of a series of sclerotized hooklike cuticular structures, in rows or circles on the prolegs; also on cremaster of chrysalides; frequently called hooks.

2. (Annelida) see crotchet.