浙江缨口鳅属鱼类一新种(鲤形目:平鳍鳅科)

A new species of the genus Crossostomafrom Zhejiang Province,China (Cypriniformes:Homalopteridae)

记述了采自浙江庆元县的缨口鳅属(Crossostoma)鱼类一新种,即亮斑缨口鳅(Crossostoma galericula Zhangsp.nov.)。测量标本均采自同一地点,体长35.0～46.5mm。背鳍条III-8;臀鳍条II-5;胸鳍条I-13;腹鳍条I-8;侧线鳞91～97。体长为体高的5.1～5.4倍,为体宽的5.4～7.0倍,为头长的3.7～3.9倍,为尾柄长的5.9～6.6倍,为尾柄高的7.2～8.8倍,为背鳍前距的1.9～2.0倍,为腹鳍前距的1.8～1.9倍。头长为头高的1.5～1.6倍,为头宽的1.1～1.3倍,为吻长的1.8～2.1倍,为眼径的5.5～6.4倍,为眼间距的2.8～3.1倍。尾柄长为尾柄高的1.1～1.3倍。头宽为口裂宽的2.2～2.5倍。新种吻褶具13条吻须,吻须基部均与吻褶相连,排成1排;与近似种横纹缨口鳅(C.fasciolatus)相比,新种有如下明显的区分特征:(1)最长吻须与眼径等长;(2)背鳍基后部两侧具1对亮斑;(3)各鳍均无明显的斑纹;(4)腹部裸区延伸至腹鳍起点。

The present paper reports a new species of Crossostoma collected from Zhejiang Province,China.Crossostoma galericula Zhang sp.nov.（Fig.1）.Holotype： ZH070616,total length 54.1 mm,standard length 43.0 mm,collected in June,2007 from a rivulet in Hehu Town,Qingyuan County,Zhejiang Province,China.Paratypes： 3 specimens,ZH070618（57.5 mm TL,46.5 mm SL）,ZH070621（50.5 mm TL,41.0 mm SL）and ZH070622（43.4 mm SL,35.0 mm SL）.All paratypes have the same locality and same time as the holotype.D.III-8;A.II-5;P.I-13;V.Ii-8.Scales in L.l.91-97.Depth of body in standard length 5.1-5.4,width of body 5.4-7.0,length of head 3.7-3.9,length of caudal peduncle 5.9-6.6,depth of caudal peduncle 7.2-8.8.Depth of head in head length 1.5-1.6,width of head 1.1-1.3,length of snout 1.8-2.1,diameter of eye 5.5-6.4,width of interorbital space 2.8-3.1.Depth of caudal peduncle in length of caudal peduncle 1.1-1.3.Width of mouth in width of head 2.2-2.5.Diagnosis： the new species has 13 sub-rostral barbells on the rostral fold.Bases of the rostral barbells are always connected to the rostral fold,and arranged in 1 row.This new species is similar to C.fasciolatus.But it can be distinguished from C.fasciolatus by the following comparisons：（1） the length of the longest rostral barbell is equal to the diameter of eye;（2） with 2 bright spots behind the sides of the dorsal fin;（3） all fins have no obvious spot;（4） naked area in abdomen extends to the base of the ventral fin.