南鳅属鱼类一新种及南鳅属评述

记述了南鳅属鱼类一新种－－异颌南鳅Ｓｃｈｉｓｔｕｒａ ｈｅｔｅｒｏｇｎａｔｈｏｓ ｓｐ．ｎｏｖ．，用作新种描述的模式标本共７属，其中正模标本１属，体长８０．０ｍｍ，编号８８１０２４０；副模标本６属，体长９５．０－１０５．０ｍｍ，编号８８１０２４１、８８１０２４１、８８１０１５０￣８８１０１５３。１９８８年采自云南省勐腊县的那着和曼庄，属澜沧江下游支流南腊河。所有模式标本均保存于中国科学院水生生物研

A NEW LOACH OF Schistura AND COMMENTS ON THE GENUS

Schistura heterognathos Chen,sp.nov.is described based on specimens from the Nanla River,a tri butary of the Lancangjiang River (upper Mekong River),in Yunnan Province of China.It is especially characterized by its abnormal jaws.The jaws are broad,thick and strong.The upper jaw has no dentoid process and there is a very small or no notch in the lower jaw.The dissociative margins of jaws are straight.The mouth is broad and transversal,its width approximately equals to snout length and is greater than the interorbital width.