Proposal of New Terminology for the Morphology of Nauplius Y (Crustacea: Maxillopoda: Facetotecta), with Provisional Designation of Four Naupliar Types from Japan

Abstract

New terminology for the morphology of first stage nauplius y larvae, mainly for the plates on their cephalic shield, is proposed. The proposed terminology aids in the identification of plates which vary in place and/or shape among naupliar types, and simplifies the description of nauplius y larvae. Four nauplius y larvae from Japan which are cited to explain the terminology are provisionally designated as separate types, symbolized as VIII-a, IX, X, and XI, the last being for the nauplius which was formerly described as a larva of Hansenocaris pacifica Ito.