Redefinition of a Doubtful Cyprinid, Acheilognathus mesembrinum Jordan and Evermann, 1902, with Replacement in the Valid Genus, Metzia Jordan and Richardson, 1914, a Senior Synonym of the Genus Rasborinus Oshima, 1920

Abstract

Rexamination of the three type specimen series of Taiwanese cyprinids including Acheilognathus mesembrinum Jordan and Evermann, 1902 (described type locality, Kotosho or Lanyu); Ischikauia macrolepis Regan, 1908 and Rasborinus takakii Oshima, 1920 confirmed that they are the same species. The important discovery for the type correct locality of A. mesembrinum is Suwata (Suwo Bay), Ilan County, not Kotosho (Lanyu) as listed in his publication. The result also suggests that all original descoveries of the localities for these type specimens should be in Taiwan and they should be placed under the valid genus, Metzia Jordan and Richardson, 1914 which is a senior synonym for Rasborinus Oshima, 1920.