*nauplius*

‖n.; pl. Nauplii [ L., a kind of shellfish, fr. Gr. nay^s ship + &unr_; to sail. ] (Zool.) A crustacean larva having three pairs of locomotive organs (corresponding to the antennules, antennae, and mandibles), a median eye, and little or no segmentation of the body. [ 1913 Webster ]