Vol 14 No 3 July 2015
A grotesque variant of Silurus asotus (Teleostei: Siluridae) from Hongshuihe River basin, Guizhou, China
Description:1-Key Laboratory for Animal Genetic Diversity and Evolution of High Education in Yunnan Province, School of Life Science, Yunnan University, Kunming, Yunnan 650091 P.R. China. 2-School of Chemistry and Life Sciences, Guangxi Teachers Education University, Nanning, Guangxi 530001 P.R. China. 3-Guizhou Institute of Biology, No 1 Tongying Road, Guiyang, Guizhou, 550009 P.R. China. 4-Maolan National Nature Reserve, Libo, Guizhou 558400 P.R. China. *Corresponding author's email: yj1981yj@163.com
One grotesque catfish specimen was collected in Zhangjiang River (upper reach of a secondary tributary of Hongshuihe River) in Libo County, Guizhou Province, China. This specimen bears surprising character of four dorsal fins, which have not appeared in any other silurid fishes. But other morphological characters, such as two pairs of barbels, lower jaw projecting beyond upper jaw, the first dorsal fin with one un-branched ray and 4 branched rays, mouth cleft shallow, anterior spine margin of pectoral spine prominently serrated, vomerine tooth band continuous across midline, show much similarities with that ofSilurus asotus. This result supports that this variant originated fromS. asotus for some special causations. The present study provided description and comparison withS. asotus.

Keywords: Variant,Silurus asotus, Siluridae, Guizhou, China
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