中国贵州省穴居盲鳅一新种(鲤形目,爬鳅科)

记述了采集于贵州省荔波县佳荣镇水井湾溶洞(25°28’N,108°06’E)适应洞穴环境的鳅类1新种:佳荣盲高原鳅Triplophysa jiarongensis sp.nov.。新种与之前记录的7种分布于西江水系的高原鳅(阿庐高原鳅、个旧盲高原鳅、长须盲高原鳅、巨头高原鳅、邱北盲高原鳅、石林盲高原鳅和天峨高原鳅)同属典型洞穴鱼类,都具有一系列与洞穴环境有关的适应性特征。新种与本属其它种类的区别主要为:胸鳍长,后伸达腹鳍起点;尾鳍微凹形;体表色素退化,光滑裸露无鳞;背鳍截形,起点位于腹鳍起点略后方;腹鳍后伸盖过泄殖孔;臀鳍截形;尾柄上下缘存在脂状鳍褶;背鳍分支鳍条8;臀鳍分支鳍条6;胸鳍分支鳍条11;脊椎骨总数4+34;眼完全退化,外观无痕迹;鳔前室被骨质鳔囊包裹,后室发达膨大呈游离膜质鳔。此外还介绍了其栖息地概况和部分生态学信息。

A NEW SPECIES OF TROGLOBITIC LOACH (CYPRINIFORMES,BALITORIDAE) , TRIPLOPHYSA JIARONGENSIS, FROM GUIZHOU,CHINA

A new species of troglobitic loach,Triplophysa jiarongensis sp.nov.is described based on the collections from Shuijingwan Cave(25° 28’ N,108°06’E),Jiarong T own,Libo County,Guizhou Province,China.T he new species distributes in the Xijiang water system such as seven previously known congeneric troglobitic loaches(T.aluensis,T.gejiuensis,T.longibarbata,T.macrocephala,T.qiubeiensis,T.shilinensis and T.tianeensis).It shares many morphological characters with them that associated with subterranean environment.T his new species can be distinguished from other congeneric species by following combination of characters:pectoral fin highly developed,reaching the origin of pelvic fin;caudal fin emarginated;distal margin of dorsal fin truncate;dorsal-fin origin posterior to vertical line of pelvic fin origin;pelvic fin tip reaching beyond anus;distal margin of anal fin truncate;adipose-like fin present,along dorsal and ventral edge of caudal peduncle;branched rays of dorsal fin 8;branched rays of anal fin 6;branched rays of pectoral fin 11;total vertebra 4 + 34;pigmentation degenerated;body smooth and scaleless;eyes completely degenerated;anterior chamber of air-bladder wrapped in bony capsule,posterior chamber of air-bladder well developed.In addition,this study introduces the profile of habitat and ecological information on the T.jiarongensis.