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JOURNAL OF PLANKTON RESEARCH | VOLUME 20 | NUMBER 6 | PAGES 1061-1072 | 1998
© Oxford University Press

research-article

Distinguishing between Stage I and Stage II nauplii of the copepods Metridia and Pseudocalanus from the Bering Sea

Deborah L.W. Siefert

Alaska Fisheries Science Center National Oceanic and Atmospheric Administration, 7600 Sand Point Way NE, BIN C15700, Seattle, WA 98115–0700, USA

Received on June 2, 1996; accepted on December 21, 1997 Stage I nauplii of Metridia pacifica, Stage I and II nauplii of Metridia lucens, and the equivalent stages of Pseudocalanus mimus were reared from eggs to find morphological characters for separating the genera at these stages. Differences in naupliar body shape and caudal armature permit the differentiation of Stage I and II Metridia from Pseudocalanus in southeastern Bering Sea plankton.


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