四川西部高原鳅属鱼类两新种(鲤形目:鳅科)

TWO NEW SPECIES OF THE GENUS TRIPLOPHYSA FROM WESTERN SICHUAN (CYPRINIFORMES:COBITIDAE)

本文报道采自四川西部安宁河的高原鳅属 Triplophysa Rendahl,1933 鱼类两新种:大桥高原鳅 Triplophysa daqiaoensis sp.nov.和短须高原鳅 Triplophysa brevibarba sp.nov。对新种的特征进行了描述,并与近似种的形态学特征作了比较。

This paper describes two new.species of the genus Triplophysa Rendahl, 1933 collectedfrom Western Sichuan, China. Triplophysa daqiaoensis sp. nov. (fig. 1--4) Holotype No. 900267, adult, female, total body length 137 mm, standard body length116 mm, collected on April 7, 1990 from Daqiao of Minning County (28°41′N, 102°12′E, altitude2020 m), Sichuan, China. Allotype No. 900270, adult, male, total body length 110 mm, stan-dard body length 90 mm,date and locality same as holotype. Paratypes 52 specimens, No.900268--269, 900271--321, total body length 112--145 mm. standard length 92--120 mm, dataand locality same as holotype. Paratype No. 900288 specimen is kept in the Institute of Hyd-robilogy, Academia Simica, Wahan, China. Other type specimens are deposited in the SichuanInstitute of Natural Resource, Chengdu. D.iv-7; P.i-10--12; V.i-6-7; A.iii--5; C.i-16-i. Gill-rakers on the outer row of the firstarch 1--4, on the inner row 10--14. Vertebrae 4+38--40+1 (10 specimens). Depth 6.7 (5.8--7.5) in standard body length, head 5.6 (5.0--6.2), length of caudal pe-duncle 7.6 (6.0--9.2), its depth 11.6 (10.0--13.1). Snout 2.4 (2.2--2.5) in head, eye 6.8 (6.0--7.6), interorbital space 2.8;(2.2--3.5). Depth of caudal peduncle 1.8 (1.5--2.0) in its length. Diagnosis The new species resembles T. anterodosalis Zhu et Cao., 1989 but differs fromit in the position of dorsal fin more posterior and having a black--brown longitudinal stripe.round the lateral line;,gill-rakers on the outer row of the first arch 1--4. The new species is similar to T. hutjertjuensit (Rendahl, 1933), but differs from the laterin the lateral line complete; the position of dorsal fin more porterior; free portion of air-blad-der absent; ventral fin shorter and its end not reaching to the anal opening. In appearance this new fish is also similar to T. microps (Steindachner, 1866), but differsfrom it by the complete lateral line; a dark brown longtitudinal stripe on the body; the lengthof annal fin more than 1/2 the distance between the starting point of the anal fin and the baseof the caudal fin; Depth of caudal peduncle 6.0--9.2 (4.2--5.9) in its length. Triplophysa brevibarba sp. nov. (fig. 5--8) Holotype No. 900264, adult, female, total body length 93mm, standard body length78 mm, collected on April 7, 1990 from Mianning County (28°34′N, 102°10′E, altitude 2000 mabove sea level), Sichuan, China. Allotype No. 850384, adult, male, total body length 94 mm,standard body length 78 mm, collected on May 20, 1985 from Aning Rever. Paratypes 11 speci-mens, No. 900254--263, total body length 61--95 mm, standard body length 55--78 mm, dateand locality same as holotype No.85038 date and locality same as allotype, the latter specimen is kept in the Institute of Hydrobiology, Academia Sinica, Wuhan, China. The other typespecimens are preserved in the Sichuan Institute of Natural Resources, Chengdu, China. D.iii-8; P.i--11--12; V.i-7; A.iii--5; C.i--16-i. Gill-rakers on the inner row of the first arch22--23. Vertebrae 4+37--38+1 (3 specimens). Depth 5.1 (4.9--5.3) in standard bogy length, head 4.8 (4.5--5.2), length of caudal pe-duncle 5.6 (5.9--7.1), depth of caudal peduncle 11.8(10.7--13.0). Snout 2.2(2.1--2.2) in head,eye 5.9(5.3--6.5), interorbital space 3.2(2.7--3.7). Depth of caudal peduncle 1.9(1.8--2.0) inits length. Diagnosis: In appearance this new fish is similar to T. stoliczkae (Steindachner, 1866),but differs from the latter in: head shorter, wider and flater; its beards shorter and smaller,the beard length of the maxilla as long as the eye--diameter; and no mottle in the body.