Volume 35 Issue 1
Jan.  2014
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Marco Endruweit. Schistura sexnubes, a new diminutive river loach from the upper Mekong basin, Yunnan Province, China (Teleostei:Cypriniformes:Nemacheilidae). Zoological Research, 2014, 35(1): 59-66. doi: 10.11813/j.issn.0254-5853.2014.1.059
Citation: Marco Endruweit. Schistura sexnubes, a new diminutive river loach from the upper Mekong basin, Yunnan Province, China (Teleostei:Cypriniformes:Nemacheilidae). Zoological Research, 2014, 35(1): 59-66. doi: 10.11813/j.issn.0254-5853.2014.1.059

Schistura sexnubes, a new diminutive river loach from the upper Mekong basin, Yunnan Province, China (Teleostei:Cypriniformes:Nemacheilidae)

doi: 10.11813/j.issn.0254-5853.2014.1.059
  • Received Date: 2013-01-29
  • Rev Recd Date: 2013-02-26
  • Publish Date: 2014-01-08
  • An ichthyofaunistic survey of Mekong tributaries in Lincang Prefecture, Yunnan Province, China yielded a new species of nemacheilid loach, herein described as Schistura sexnubes species nova. The new species is readily distinguishable from its congeners by the following combination of characters: 8+8 branched caudal fin rays, an incomplete lateral line, a dissociated caudal bar, a shallow caudal peduncle depth (7.6%-9.6% SL; respectively caudal peduncle 1.76-1.95 times longer than deep), a diminutive size of less than 50 mm SL, and no sexual dimorphism. A dorsocephalic pattern consisting of a black, forward directed V-shaped formation located between the nares, and a white, ovoid blotch on the upper operculum serves as an autapomorphy.
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  • [1] Bleeker P. 1863. Sur les genres de la famille des Cobitioïdes. Verslagen en Mededeelingen der Koninklijke Akademie van Wetenschappen. Afdeling Natuurkunde, (15): 32-44. (in French)
    [2] Chen XY, Kong DP, Yang JX. 2005. Schistura cryptofasciata, a new loach (Cypriniformes: Balitoridae) from Salween drainage in Yunnan, southwestern China. The Raffles Bulletin of Zoology Suppl., (13): 27-32.
    [3] Chen XY, Pan XF, Yang JX. 2010. Chapter 13 Fishes. In: Wang J, Du F, Yang YM. Survey and Research on the Upper Mekong River Provincial Nature Reserve, Yunnan, China, 373-407. (in Chinese)
    [4] Chen ZM, Yang JX, Qi WL. 2005. Description of a new loach of Schistura from Lancang River basin, Yunnan China. Acta Hydrobiologica Sinica, 29(2): 146-149.
    [5] Endruweit M. 2011. Schistura porthos Kottelat, 2000, a new record of nemacheilid loach for China. Zoological Research, 32 (5): 572-574.
    [6] Fowler HW. 1934. Zoological results of the third De Schauensee Siamese Expedition, Part I. Fishes. Proceedings of the Academy of Natural Sciences of Philadelphia, (86): 67-163.
    [7] Kottelat M. 1990. Indochinese nemacheilines. Verlag Dr. Friedrich Pfeil, M黱chen.
    [8] Kottelat M. 2000. Diagnoses of a new genus and 64 new species of fishes from Laos (Teleostei: Cyprinidae, Balitoridae, Bagridae, Syngnathidae, Chaudhuriidae and Tetraodontidae). Journal of South Asian Natural History, 5 (1): 37-82.
    [9] Kottelat M. 2001. Fishes of Laos. Wildlife Heritage Trust Publications, Colombo: 1-198, Pls. 1-48.
    [10] Ou C, Montaña CG, Winemiller KO, Conway KW. 2011. Schistura diminuta, a new miniature loach from the Mekong River drainage of Cambodia (Teleostei: Nemacheilidae). Ichthyological Exploration of Freshwaters, 22 (3): 1193-200.
    [11] Smith HM. 1945. The freshwater fishes of Siam, or Thailand. Bulletin of the United States National Museum, 188: i-xi,1-622.
    [12] Zheng LP, Chen XY, Yang JX. 2009. Composition and Status of Fishes of Nanla River in Xishuangbanna, Yunnan, China. Zoological Research, 30(3): 334-340.
    [13] Zhu SQ. 1982. Five new species of fishes of the genus Nemachilus from Yunnan Province, China. Acta Zootaxonomica Sinica, 7(1): 104-111. (in Chinese, English summary)
    [14] Zhu SQ. 1989. The loaches of the subfamily Nemacheilinae in China. Nanjing. (in Chinese)
    [15] Zhu SQ, Wang SH. 1985. The noemacheiline fishes from Yunnan Province, China (Cypriniformes: Cobitidae). Acta Zootaxonomica Sinica, 10(2): 208-220. (in Chinese, English summary)
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Schistura sexnubes, a new diminutive river loach from the upper Mekong basin, Yunnan Province, China (Teleostei:Cypriniformes:Nemacheilidae)

doi: 10.11813/j.issn.0254-5853.2014.1.059

Abstract: An ichthyofaunistic survey of Mekong tributaries in Lincang Prefecture, Yunnan Province, China yielded a new species of nemacheilid loach, herein described as Schistura sexnubes species nova. The new species is readily distinguishable from its congeners by the following combination of characters: 8+8 branched caudal fin rays, an incomplete lateral line, a dissociated caudal bar, a shallow caudal peduncle depth (7.6%-9.6% SL; respectively caudal peduncle 1.76-1.95 times longer than deep), a diminutive size of less than 50 mm SL, and no sexual dimorphism. A dorsocephalic pattern consisting of a black, forward directed V-shaped formation located between the nares, and a white, ovoid blotch on the upper operculum serves as an autapomorphy.

Marco Endruweit. Schistura sexnubes, a new diminutive river loach from the upper Mekong basin, Yunnan Province, China (Teleostei:Cypriniformes:Nemacheilidae). Zoological Research, 2014, 35(1): 59-66. doi: 10.11813/j.issn.0254-5853.2014.1.059
Citation: Marco Endruweit. Schistura sexnubes, a new diminutive river loach from the upper Mekong basin, Yunnan Province, China (Teleostei:Cypriniformes:Nemacheilidae). Zoological Research, 2014, 35(1): 59-66. doi: 10.11813/j.issn.0254-5853.2014.1.059
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