Abstract
Euchaetid copepods (Calanoida, Clausocalanoidea) were collected from the southeastern region of Korea and the East/Japan Sea from June 2007 to August 2008. Seven species were found and redescribed in this study: five species from the genus Euchaeta (E. concinna, E. indica, E. longicornis, E. plana and E. rimana) and two species from the genus Paraeuchaeta (P. elongata and P. russelli). Using scanning electron microscopy, we observed detailed taxonomic features with special references to their genital structure. The euchaetid copepods show speciesspecific characteristics on their genital structures, in particular on the shapes of genital operculum and genital flange. Their zoogeographies were also discussed. They can be regarded as an indicator species of the Tsushima Warm Current and East Sea Intermediate Water.
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