Markhaseva, E. L., Abramova, A. A. and Mingazov, N. D. (2012) Pseudocalanus acuspes (Crustacea: Copepoda) from the White Sea. Proceedings of the Zoological Institute RAS, 316 (1). pp. 57-70.

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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.

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