广西薄鳅属鱼类一新种(鲤形目,鳅科)

A NEW SPECIES OF THE GENUS LEPTOBOTIA FROM GUANGXI,CHINA (CYPRINIFORMES COBITIDAE)

2007年10月,在广西桂平黔江采集到鳅科鱼类6尾,经鉴定为薄鳅属Leptobotia1新种,定名为斑点薄鳅Leptobotia punctatus sp.nov.。新种须3对,眼下刺不分叉,颊部有鳞。这些特征与薄鳅属一致。新种颏下无1对纽状突起,眼小,口角须短,背鳍起点位于腹鳍起点后方等特征与同属的桂林薄鳅L.guilinensis和后鳍薄鳅L.posterodorsalis最为相似。但有如下鉴别特征：新种体侧无垂直条纹,脊椎数目多,腹鳍末端不达肛门等特征,与桂林薄鳅相区别;体侧有斑点,外侧鳃耙数多,体较高,尾鳍深分叉,有3-4道黑色条纹等特征,与后鳍薄鳅相区别。新种仅分布于西江水系黔江。

A new species Leptobotia punctatus sp. nov. has been recognized based on collections from Qianjiang River in Guiping City （ 23°24＇ N, 110° 24＇ E ）, Guangxi, China in Oct. 2007. The new species belongs to the genus Leptobotia since it has 3 pair of mouth barbels, simple suborbital spine and with scales on cheek. It is closely related to L. guilinensis Chen and L. posterodorsalis Lan et Chen through sharing following features： having no button-like papillae on chin region, little eye, short mouth barbels, beginning of dorsal-fin posterior to ventral-fin. But the new species can be distinguished from L. guilinensis using the following characters： having no vertical bands vs. 15-18 vertical bands; having more vertebra （4 ＋ 39 vs. 4 ＋ 35-36） ; terminal of pelvic-fin no reaching to anus vs. reaching to anus. The new species can be distinguished from L. posterodorsalis in owning a lot of white spots in body side vs. no spots; having more gill rakers （ 13-15 vs. 3-4） on the outer side of 1st gill arch; having a fatter body （depth in standard length is 4.9-6.9 vs. 6.8-7.3 ）; having a deep forked caudal fin （ the shortest fin in the longest fin is 2.4-2.5 vs. 2.0） and more strip （3-4 vs. 1） on both lobes of caudal-fin. The new species was known distributed in Qianjiang River at present. Holotype, No.07 X PRFRI001, total length 91.05 mm, standard length 76.46 mm. Paratypes 4 specimens, No.07 X（ PRFRI002-07 X PRFRI006, total length 67.19- 74.45 mm, standard length 56.54-63.58 mm. Paratype, No. 07 X PRFRI006 total length 74.45 mm, standard length 63.58 mm was deposited in Fish Collection Room of Institute of Zoology Chinese Academy of Sciences. Others were deposited in Fish Collection Room of Pearl River Fisheries Research Institute Chinese Acadamy of Fishery Sciece, Guangzhou, China.