spur

From ZooTerms (Dictionary of Invertebrate Zoology)
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spur (noun; Anglo-Saxon spora, spur): 1. A movable spine-like process.

2. (Arthropoda: Crustacea) a. In Cirripedia, a pendent-like projection from the basal margin of the tergum. b. In Ostracoda, a flattened spine-like projection in some dimorphic genera.