Unique structures, which have been observed on the spines of the chelipeds in a recently described deep-water Hawaiian hermit crab, Nematopagurus spinulosensoris McLaughlin & Brock, 1974, are herein described. At present the function of these structures is unknown; however, their morphology appears to be more complicated than that of any sensory structures heretofore ascribed to decapod crustaceans.
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