四川的裂腹鱼类一新种(鲤形目:鲤科)

A NEW SPECIES OF SCHIZOTHORACID FISHES FROM SICHUAN,CHINA(CYPRINIFOMES:CYPRINIDAE)

1980年,我们在青衣江采得裂腹鱼属(Schizothorax)鱼类的一个新种。现记述如下。异唇裂腹鱼(新种)Schizothorax heterochilus,sp,nov.(图1)地方名假重口正模标本编号6—0539,体长285毫米,♀,1980年11月5日采自雅安草坝,海拔高度600米左右;配模标本编号6—0414,体长为360毫米,♂,1980年9月13日采自雅安周公河,海拔高度约600米;副模标本6尾,编号:6—0001,6—0188,6—0404.

Schizolhorax heterochilus,sp.nov.(fig.1)D.3,8;A.2,5;P.1,17-19;V.1,9-10.Scales 9417-24/14-18-v102.Gill-rakers 15-17(outer)and 20-23(inner).Pharyngeal teeth 2,3,5-5,3,2(1).Vertebrae 44-47.Depth 4.1-4.6 in body length,head 4.1-4.9,length of caudal peduncle 5.2-5.8.Snout 2.4-2.6 in head,eye 5.7-6.8,interobital space 2.4-3.1,length of anterior barbels 3.6-5.3,length of posterior barbels 3.2-4.6.Depth of C-peduncle in its length 1.5-1.8.Body elengatc,slightly compressed.Head conical.Mouth inferior,horseshoe-shaped.Margin of lower jaw with sharp horny sheath except the mouth corner.Lower lip thick,divided into three lobes,the medium one evident.Pos.llabial groove continuous,very shallow at the middle.2 pairs of barbel,maxillary one about 1.5 times in eye diamter,its tip extending to vcrtica from posterior border of eye,the anterior one not reaching or beyond the anterior margin of eye.Thorax-abdomen region with evident scales.The length of pharyngeal bone about 3 times in its width.Tip of teeth pointed and curved,its crown surface concave,1st teeth on the inner series small.Air-bladder divided into two parts,the porsterior one about 2 times in the anterior one.Peritoneum black.The present new species differs from S.davidi(Sauvage)in the margin of lower jaw near the mouth corners without sharp horny sheath,in the evident medium lobe of lower lip instead of covered by lateral lobes and in the shorter predorsal length(48.2-51.4%vs.51.5-52.8%);from S.lissolab-iatus Tsao in the lower lip with three lobes instead of two,in the continuous postlabial groove in the scaled thorax-abdomen and in the shorter predorsal length(48.2-51.4%vs.53.0-53.4%).Holotype:No.6-0539,body length 285 mm,collected from Caoba,Yaan county,Sichuan,600 M,November 5,1980.Allotype:No.6-0414,body length 360 mm,collected from Zhougong River at Yaan,600 M,September 13,1980;Paratypes 6,body length 186-373 mm,collected from Yingjing River at Tianquan county and Zhougong River at Yaan respectively.Holotype,allotype and four paratypes(Nos.6-0001,6-0188,6-0415,6-0416)preserved in the Sichuan Agricultural University and two paratypes(Nos.6-0404,6-0405)in the Institute of Hydrobiology,Academia Sinica.