Exostoma gaoligongense, a new species of fish from the Salween drainage, Yunnan, China

A new species of the sisorid catfish genus Exostoma was collected from two hill-stream tributaries of the Nujiang.

        Gaoligong Moutain is a biodiversity hotspot in SW China. A new species of the sisorid catfish genus Exostoma was collected from two hill-stream tributaries of the Nujiang (Salween River) drainage in Gaoligong Mountain, south-western Yunnan Province, China from 2003 to 2006 and from two tributaries of the Salween River in Cangyuan County, Lingcang Prefecture, Yunnan Province, China (in 2007) and in Yongde County, Lingcang Prefecture, Yunnan Province, China (in 2015).

       Exostoma gaoligongense sp. nov. is the 10th species of the genus and is most similar to E. vinciguerrae in morphology but can be distinguished by pelvic fin reaching anus vs. not reaching; maxillary barbels just reaching or slightly surpassing pectoral-fin origin vs. surpassing pectoral-fin origin or even reaching posterior end of gill membrane; abdominal vertebrae 23–25 vs. 25–27; length of dorsal fin/dorsal to adipose distance 90.3%–287.0% vs. 59.2–85.7. It was published on Zoological Research 38(5) in a title of "A new species of sisorid catfish of the genus Exostoma from the Salween drainage, Yunnan, China" (http://www.zoores.ac.cn/CN/abstract/abstract3852.shtml).

       This work was funded by the Southeast Asia Biodiversity Research Institute, Chinese Academy of Sciences (Y4ZK111B01), the NSF project “Gaoligong Shan Biological Survey Project” (DEB-0103795), National Geographic Society grant (7340-02), and National Natural Science Foundation of China (31372182).

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Manggang River at the type locality of Exostoma gaoligongense sp. nov. (photo by David Catania)

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Holotype of Exostoma gaoligongense sp. nov. (KIZ 200310738); lateral (top), dorsal (middle), and ventral (bottom) views (photos by Xiao-Yong Chen)