First Record of Gammarus koreanus (Crustacea, Amphipoda, Gammaroidea) from Japan, Based on Morphology and 28S rRNA Gene Sequences

• DOI: 10.12782/sd.17.1.039
• Publication Date: 2013-04-11T01:37:06Z
• Authors: Ko Tomikawa; Satoko Tashiro; Norio Kobayashi
• Keywords: Telson

Gammarus koreanus Ueno, 1940, which was originally described from the Korean Peninsula, is recorded fresh-waters of Goto Islands, Japan. This first record its occurrence in Molecular analyses using partial sequences 28S rRNA gene strongly support identity Japanese populations with G. koreanus. The specimens differ original description this species following features: antenna 2 lacking calceoli, inner margins and outer rami uropod 3 plumose setae, margin ramus without setae. These differences are regarded as intraspecific variation.