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间斑副沙鳅,1935年由方炳文命名,是一种分布于中国西南部长江中游流域的有效的山溪型鳅科鱼类(硬骨鱼纲:腹吸鳅科)。

Vanmanenia intermedia Fang, 1935, a valid hill-stream species of loach (Teleostei: Gastromyzontidae) from the middle Yangtze River basin, Southwest China.

作者信息

Deng Shu-Qing, Zhang E

机构信息

The Key Laboratory of Aquatic Biodiversity and Conservation of Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, Hubei Province, China University of Chinese Academy of Sciences, Beijing 100049, China The Changjiang Civilization Museum (Wuhan Natural History Museum), Wuhan 430000, Hubei Province, China.

出版信息

Zootaxa. 2020 Jul 22;4819(1):zootaxa.4819.1.5. doi: 10.11646/zootaxa.4819.1.5.

Abstract

Vanmanenia intermedia, which has long been synonymized with V. pingchowensis since 1980, is here revalidated using morphological characters and molecular evidences, and redescribed on the basis of topotypic specimens. This species is distinguished from all other congeneric species by the following combination of characters: triangular-shaped rostral lobules without secondary rostral barbels; distal edge of dorsal-fin slightly concave; no longitudinal black stripe on the flank; a longer snout (length 52.6-64.5 % of HL); a more backwards-placed anus (the vent to anal distance 34.7-46.1% of the pelvic to anal distance); a slender caudal peduncle (depth 9.1-11.3 % of SL); a longer anal-fin base (length 7.5-9.5 % of SL); and a smaller gill opening with its upper extremity closer to the level of the lower margin of the orbit. The validity of V. intermedia is also confirmed by its significant cyt b gene sequence divergence with all sampled congeneric species and its monophyly recovered in the cyt b gene-based phylogenetic analysis.

摘要

间斑小鲃长期以来自1980年起就与平洲小鲃同义,在此利用形态特征和分子证据重新确认其有效性,并根据地模标本重新描述。该物种与所有其他同属物种的区别在于以下特征组合:吻叶呈三角形,无次生吻须;背鳍远端边缘略凹;体侧无纵向黑色条纹;吻较长(长度为头长的52.6 - 64.5%);肛门位置更靠后(腹鳍起点至肛门的距离占臀鳍起点至肛门距离的34.7 - 46.1%);尾柄细长(深度为体长的9.1 - 11.3%);臀鳍基部较长(长度为体长的7.5 - 9.5%);鳃孔较小,其上端更靠近眼眶下缘水平。间斑小鲃的有效性还通过其与所有采样同属物种显著的细胞色素b基因序列差异以及基于细胞色素b基因的系统发育分析中恢复的单系性得到证实。

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