Triplophysa shannanensis, a New Species of Tibetan Stone Loach (Nemacheilidae) from the Yarlung Tsangpo-Brahmaputra River, Tibet

IF 0.5 4区生物学 Q4 FISHERIES

Journal of Ichthyology Pub Date : 2024-02-11 DOI:10.1134/s0032945224020164

M. Wang, J. Huang, Y. Chen, D. He

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Abstract

A new species, Triplophysa shannanensis sp. nov., is described from the Yarlung Tsangpo-Brahmaputra River based on morphological and genetic analyses. The new species is distinguished from its congeners by the following combination of characters: posterior chamber of swim bladder developed, ovoid, directly connects to the anterior chamber; intestine short, zigzag-shaped and with two loops; lower jaw spoon-like, blunt, and covered by lips; snout length shorter than postorbital length; dorsal fin origin anterior to the ventral fin origin, and it closer to caudal fin base than tip of snout; the pelvic origin is just below vertical from the second branched dorsal fin ray, and tips of ventral fin reaching to anus or close to anal fin origin; vertebrae 4 + 36–38; gill rakers 10–11. Molecular phylogenetic analysis indicated that the new species is situated in the most basal of the genus Triplophysa species distributed in the Himalayan region of China. The Kimura’s 2-parameter interspecific genetic distance of the cytochrome b gene sequences of the new species differed from 5.6 to 20.3% with other Triplophysa species. Two non-native species, T. dalaica and T. scleroptera, were first found in the the Yarlung Tsangpo River, which would bring the number of Triplophysa in the Tibetan Himalaya of China to eleven species. A checklist of genus Triplophysa in Chinese Himalaya was further provided.

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西藏雅鲁藏布江-布拉马普特拉河的西藏石鳅（Nemacheilidae）新种--山南石鳅（Triplophysa shannanensis

摘要基于形态学和遗传学分析，描述了雅鲁藏布江-布拉马普特拉河中的一个新种--Triplophysa shannanensis sp.nov.。该新物种通过以下特征组合与其同属物种区分开来：鳔后室发达，卵圆形，直接与前室相连；肠短，之字形，有两个环；下颌勺状，钝，被嘴唇覆盖；吻长短于眶后长；背鳍起源在腹鳍起源的前方，且比吻端更靠近尾鳍基部；骨盆起源在背鳍第二分支的垂直下方，腹鳍尖端到达肛门或靠近臀鳍起源；脊椎骨 4 + 36-38；鳃耙 10-11。分子系统学分析表明，该新种属于分布于中国喜马拉雅地区的三鳃鲈属最基干的物种。新种细胞色素 b 基因序列的木村 2 参数种间遗传距离与其他 Triplophysa 种的差异为 5.6%至 20.3%。在雅鲁藏布江首次发现了两个非本地种，T. dalaica和T. scleroptera，这将使中国西藏喜马拉雅地区的Triplophysa种类达到11种。此外，还进一步提供了中国喜马拉雅山地区三棘鲷属的名录。

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来源期刊

Journal of Ichthyology Multiple-

CiteScore

1.00

自引率

28.60%

发文量

期刊介绍： Journal of Ichthyology is an international peer-reviewed journal published in collaboration with the Russian Academy of Sciences. It covers original studies in fish taxonomy, evolution, molecular biology, morphology, species diversity, zoological geography, genetics, physiology, ecology, behavior, reproduction, embryology, invasions, and protection. Some problems of applied ichthyology are also covered. The journal welcomes manuscripts from all countries in the English or Russian language.