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New and rare Metridia from Antarctic and Subantarctic waters (Copepoda, Calanoida: Metridinidae)

E.L. Markhaseva

Abstract. Metridia ferrarii sp. n. and M. pseudoasymmetrica sp. n. are described from females and males, both species collected in the South Atlantic and South-Eastern Pacific (Southern Ocean). Redescriptions are given for M. asymmetrica Brodsky, 1950, M. ornata Brodsky, 1950, M. princeps Giesbrecht, 1889 and M. macrura Sars, 1905. Females of M. ferrarii are clearly distinguished from the related metridinids in the presence of collar on both sides of cephalosome; males differ from those of M. princeps in the strongly asymmetrical P5 left coxopod, absence of pointed attenuations on left and rigth second segments of antennule and some other characters. M. ferrarii differs from M. ornata mostly in the longer caudal rami, longer hook-like spines at P2 Enp and the shape of the genital somite. Females of M. pseudoasymmetrica differ from those of the related species M. asymmetrica mainly in the shape and location of spermathecea (oval and overlapping in lateral view in M. psedoasymmetrica vs. round and not overlapping in M. asymmetrica) and in presence of distinct indentation of the genital somite (in lateral view); males of M. pseudoasymmetrica are very similar to those of M. asymmetrica, but differ in setation of left P5 and absence of short spinules at the second urosomal somite on the rigth and presence of short hairs at the fourth urosomal somite on the left.

Zoosystematica Rossica, 2000, 9(1): 43–75  ▪  Опубликовано в печати 16 апреля 2001 г.


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Литература

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