On the Nauplius of Undinula vulgaris (DANA), (Copepoda, Calanoida)

Abstract

Three nauplius stages of Undinula vulgaris, the first, the third and the fifth stages, were studied. The nauplius is oval in out-line in early stages, becoming more elongate with each successive stage. The dorsoventral flexure in the posterior portion of body curves ventrally. The nauplius of U. vulgaris can be distinguished from those of other species of the family Calanidae by the structure of appendages in the respective stages.