finger
From ZooTerms (Dictionary of Invertebrate Zoology)
structure resembling or used like a finger.
finger (noun; Anglo-Saxon finger, finger): 1. Any
2. (Arthropoda: Crustacea) a. In Decapoda, one of the scissor-like blades at the end of the cheliped, usually one is movable and one fixed. b. In Ostracoda, a dorsal and ventral process of the male copulatory apparatus which are thought to be tacticle organs and may also assist in directing or holding certain structures during copulation.