Abstract
All 6 naupliar stages of Metridia pacijica are described. Naupliar development is compared within the genus Metridia and external morphological characters are discussed with respect to previous studies on co-occurring nauplii of Calanus, Neocalanus, and Pseudocalanus. A key to the identification of the naupliar stages is provided. Knowledge of naupliar morphology is very important for studies of stage-dependent biological and ecological phenomena. Larval walleye pollock (Theragra chalcogramma Pallas) in the southeastern Bering Sea are very selective in the species of copepods and developmental stages that they eat. They prefer nauplii of Metridia, although these nauplii are relatively rare (Hillgruber et al., 1995). As part of a study of biological and physical variability that influences recruitment of walleye pollock in the southeastern Bering Sea, I describe the naupliar stages of Metridia pacifica Brodsky, 1950, and those diagnostic features that facilitate their identification.
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