Sun Zhi-Xian, Tang Wen-Qiao, Zhao Ya-Hui
Shanghai Universities Key Laboratory of Marine Animal Taxonomy and Evolution, Shanghai Ocean University, Shanghai, 201306, China Institute of Zoology, Chinese Academy of Sciences Beijing China.
Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101, China Shanghai Ocean University Shanghai China.
Zookeys. 2024 Oct 4;1214:161-186. doi: 10.3897/zookeys.1214.127061. eCollection 2024.
Although (Nichols, 1926) has been treated valid since it was described, its morphology remains vague, especially when comparing it with another similar species, (Yao & Yang, 1977). In this study, the types of both species were examined and also compared with several lots of specimens from a wide geographical range: there is no significant difference in morphology between them. Additionally, molecular evidence supported by mitochondrial gene sequence also showed low genetic distance in between. Thus, it is suggested that is a junior synonym of . While revising these two species, a new species, sp. nov., was discovered that has a similar distribution with them both. However, it can be distinguished from its congeners by having a globular or oval shaped posterior air-bladder chamber which length 58.6%-82.8% of eye diameter; a narrow upper jaw cutting edge which less than half mouth width; a slender caudal peduncle with depth 34.6%-48.5% of length; and a six-branched-ray anal fin. This new species also has numerous small black spots on all fins which is also unique. The new species is morphologically and molecularly close to (Nichols, 1930).
尽管（尼科尔斯，1926年）自被描述以来一直被视为有效物种，但其形态仍然模糊不清，尤其是在将其与另一个相似物种（姚和杨，1977年）进行比较时。在本研究中，对这两个物种的模式标本进行了检查，并与来自广泛地理范围的多个标本批次进行了比较：它们在形态上没有显著差异。此外，线粒体基因序列支持的分子证据也表明它们之间的遗传距离较低。因此，有人认为[第一个物种名称]是[第二个物种名称]的次异名。在修订这两个物种时，发现了一个新物种，[新物种名称]新种，其分布与它们两者相似。然而，它可以通过以下特征与同属物种区分开来：具有球形或椭圆形的后气囊腔，其长度为眼径的58.6%-82.8%；上颌切割边缘狭窄，小于口宽的一半；尾柄细长，深度为长度的34.6%-48.5%；以及有六分支鳍条的臀鳍。这个新物种的所有鳍上还有许多小黑点，这也是独一无二的。这个新物种在形态和分子上与（尼科尔斯，1930年）的[相关物种名称]相近。
