Pseudocalanus acuspes (Crustacea: Copepoda) from the White Sea

E.L. Markhaseva, A.A. Abramova and N.D. Mingazov

Proceedings of the Zoological Institute RAS, 2012, 316(1): 57–70 · https://doi.org/10.31610/trudyzin/2012.316.1.57

Full text

Abstract

The presence of Pseudocalanus acuspes in the White Sea is confirmed. In this northern Sea P. acuspes coexists with its congener P. minutus. The morphological characters proposed by Frost (1989) as distinguishing for P. minutus and P. acuspes apply well for the White Sea specimens. A key diagnostic character is P4 coxopod to basipod ratio, which is more than 1.5 in P. minutus and less than 1.5 in P. acuspes. Additional characters are: size of spiniform processes on postero-ventral margins of pedigerous somites 2 and 3, prosome to urosome ratio, and shape of cephalon in anterior lateral view. In females morphology of oral parts does not help in distinguishing between species, but is helpful for males.

Key words

Copepoda, P. minutus, P. acuspes, the White Sea

Submitted November 10, 2011 · Accepted February 27, 2012 · Published March 23, 2012

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