See: nauplius [Brusca and Brusca, 2002].
(Subclass Mystacocarida):
Larval stage at which most mystocacarids hatch. Characterized by presence of only three appendage pairs (antennules, antennae, mandibles). (See also metanauplius) [Stachowitsch, 1992].
Crustacea glossary. Natural History Museum of Los Angeles County. 2011.