Fukuoka Institute of Health and Environmental Sciences, Mukaizano 39, Dazaifu, Fukuoka, 8110135 Japan..
Osaka Medical and Pharmaceutical University, Daigakumachi 27, Takatsuki, Osaka, 5690801 Japan..
Zootaxa. 2022 Jul 11;5162(5):525-540. doi: 10.11646/zootaxa.5162.5.4.
A new loach species, Misgurnus amamianus, is described based on 27 type specimens sampled from Ryukyu Islands, Japan. This new species can be distinguished from its congeners by the following combination of characteristics. 1) In adult males, a lamina circularis at the base of the pectoral fin is poleaxe-shaped and rounded at the back. 2) The last ray of dorsal fin is not branched, and its length is less than half the length of the second-branched soft ray. 3) The projected length from the posterior edge of the anal-fin base to the caudal-fin base is longer than the length from the insertion point of the pelvic fin to the anterior edge of the anal-fin base. 4) The ridges on the caudal peduncle at the upper and lower edges are weakly developed. The validity of this new species is also supported by the phylogenetic analysis of the mitochondrial DNA control region.
一种新的泥鳅物种，日本拟腹吸鳅，基于从日本琉球群岛采集的 27 个模式标本进行描述。这个新物种可以通过以下特征组合与同属的其他物种区分开来。1）在成年雄性中，胸鳍基部的圆形板呈斧形，背面圆润。2）背鳍的最后一鳍条不分叉，其长度小于第二分支软鳍条的一半。3）从肛鳍基部后缘到尾鳍基部的投影长度大于从腹鳍插入点到肛鳍基部前缘的长度。4）尾柄上下边缘的脊发育较弱。该新物种的有效性也得到了线粒体 DNA 控制区的系统发育分析的支持。
