The identity of Limnoncaea diuncata Kokubo, 1914 (Copepoda: Poecilostomatoida) from Hokkaido, Japan, with the relegation of Diergasilus Do, 1981 to a junior synonym of Thersitina Norman, 1905
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Both sexes of an ergasilid copepod, Limnoncaea diuncata Kokubo, 1914, are redescribed based on planktonic specimens collected from the type-locality in Hokkaido, Japan. Comparison of this species with Thersitina gasterostei (Pagenstecher, 1861) revealed that they are conspecific. Another ergasilid genus with two claws on the antenna, DiergasilusDo, 1981, is relegated to synonymy with Thersitina Norman, 1905. The diagnosis of Thersitina is amended.
CitationOhtsuka, S., Ho, J., Nagasawa, K., Morozinska-Gogol, J., & Piasecki, W. (2004). The identity of Limnoncaea diuncata Kokubo, 1914 (Copepoda: Poecilostomatoida) from Hokkaido, Japan, with the relegation of Diergasilus Do, 1981 to a junior synonym of Thersitina Norman, 1905.
The present study was partly supported by a grant awarded to SO from the Ministry of Education, Science, Sports and Technology of Japan. Thanks are also due to Drs. S. Ban and S. Hiruta for providing us with ergasilids from Hokkaido, and to Prof. G. A. Boxshall for providing us with Thersitina gasterostei from the United Kingdom and useful literature. We would like to express our sincere thanks to Dr. Z. Kabata and an anonymous referee for reviewing the manuscript. Completion of this work was supported by a grant to SO from the Japan Society for the Promotion of Science (No. 14560151) and by a grant to JSH from the Paramitas Foundation.