Abstract
Two new species of Jesogammarus from Japan (Crustacea, Amphipoda, Anisogammaridae), with comments on the validity of the subgenera Jesogammarus and Annanogammarus
Highlights
The amphipod genus Jesogammarus Bousfield, 1979 inhabits fresh and brackish waters of the Japanese archipelago, the Korean Peninsula, and the Chinese continent (Bousfield 1979, Morino 1984, 1985, 1986, 1993, Lee and Seo 1990, 1992, Tomikawa and Morino 2003, Tomikawa et al 2003, Hou and Li 2004, 2005, Tomikawa 2015)
The present findings of the two new Jesogammarus species collected from Japan suggest that the true species diversity of the Japanese Jesogammarus remains unknown
The freshwater J. bousfieldi described from Yamagata Prefecture has been treated as a population of J. paucisetulosus, which was thought to be widely distributed in Ibaraki, Yamagata and Niigata Prefectures (Tomikawa 2007, Tomikawa and Morino 2012)
Summary
The amphipod genus Jesogammarus Bousfield, 1979 inhabits fresh and brackish waters of the Japanese archipelago, the Korean Peninsula, and the Chinese continent (Bousfield 1979, Morino 1984, 1985, 1986, 1993, Lee and Seo 1990, 1992, Tomikawa and Morino 2003, Tomikawa et al 2003, Hou and Li 2004, 2005, Tomikawa 2015). Morino (1984) described a second species in Jesogammarus, J. paucisetulosus Morino, 1984 from Japan. Morino (1985) relegated Annanogammarus as a subgenus under Jesogammarus because the character combination of J. paucisetulosus and additional new species bridged the morphological gap between the two genera Jesogammarus and Annanogammarus. A key to Jesogammarus species is provided and modified from that given in Tomikawa (2015)
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