Echinosocius is a genus of copepods in the family Taeniacanthidae. The feature that best distinguishes this genus from others in its family is the maxillipeds, which are pear-shaped, non-prehensile and clawless in females. All known species of this genus were collected from Diadema setosum, a species of sea urchin. Species Echinosocius contains the following species:
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