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Abstract
A revision of the genus Eogammarus is made based on type material and on collections from numerous localities. The following eight species are redescribed: E. kygi (Derzhavin, Citation1923), E. barbatus (Tzvetkova, Citation1965), E. confervicolus (Stimpson, Citation1856), E. oclairi Bousfield, Citation1979, E. psammophilus Bousfield, Citation1979, E. schmidti (Derzhavin, Citation1927), E. possjeticus (Tzvetkova, Citation1967), and E. tiuschovi (Derzhavin, Citation1927). A new species is described under the name of E. itotomikoae sp. nov. Eogammarus sinensis Ren, Citation1992 is relegated to a junior synonym of E. possjeticus. Eogammarus turgimanus is transferred into Jesogammarus. In the descriptions of species, special attention is paid to the following characters: the condition of the posterodistal seta on the peduncular article 1 of antenna 1, the number and length ratio of aesthetascs on antenna 1, the setal ornamentation of the peduncular article 1 of antenna 2, the setae ornamentation of the palp article 1 of the maxilla 1, the number of retinacula on the pleopods, and the dorsal condition of pleonites. A key to the species of Eogammarus is provided.
Acknowledgements
We are grateful to the following colleagues who provided specimens: H. Ariyama (Osaka Prefectural Fisheries Experimental Station), T. Ito (Hokkaido Fish Hatchery), K. Kuribayashi (JICA Cambodia Office), Y. Kuwahara (Hokkaido Abashiri Fisheries Experimental Station), N. Matsumoto (Hokkaido University), N. Minakawa (Saga University), H. Mukai (Hokkaido University), M. Nakajima (Hokkaido Fish Hatchery), A. Ohtaka (Hirosaki University), N. Tzvetkova (Zoological Institute, St Petersburg), K. Wada (Nara Woman's University), T. Yamauchi (Hiroshima University). We are very grateful for useful comments and critical reading of the manuscript by M. Dick (Hokkaido University) and W. Vader (Troms⊘ Museum). Thanks are due to J. Price (Canadian Museum of Nature, Ottawa) for providing access to specimens deposited at CMN, Ottawa and M. Takeda (The National Science Museum, Tokyo) who kindly supplied catalogue numbers for type material of E. itotomikoae. This study was partly supported by a grant from the Northern Advancement Center for Science and Technology (NOASTEC) and Research Fellowships from the Japanese Society for the Promotion of Science for Young Scientists.