中国麦穗鱼属一新种(鲤形目,鲤科)

A NEW SPECIES OF THE GENUS PSEUDORASBORA FROM GUANGDONG PROVINCE,CHINA (CYPRINIFORMES,CYPRINIDAE)

作者于2001年在广东省潮州市凤凰山天池采到鲤科鱼类8尾,经鉴定为1新种,定名为断线麦穗鱼Pseudorasbora interrupta sp.nov.。新种口上位、无口须,归入麦穗鱼属。新种与同属的麦穗鱼Pseudorasbora parva（Temmincket Schlegel）相似,但有如下鉴别特征：侧线不完全,侧线鳞仅7-15枚;体较低,不及头长;上颌骨侧突和下颌骨冠状突较不发达。

Pseudorasbora interrupta sp.nov.is described on 8 specimens collected from the top lake of Fenghuang Mountain（23°55＇N,116°36＇E）,Chaozhou City,Guangdong Province,China in 2001.The new species belong to the genus Pseudorasbora since its mouth is oblique and without barbel on jaws.It closely resembles P.parva（Temminck et Schlegel）distributed in east Asia,but differs from latter as follows：an incomplete lateral line scales,a lower body depth which is always shorter than head length and a weak lateral process of maxilla bone.Meanwhile,it also resembles P.pumila distributed in Japan with incomplete lateral line scales,but differs from the latter in the number of lateral line scales with 7-15 vs.3-5.Holotype No.01VI1001,total length 67.0mm,standard length 55.0mm,Paratypes No.01VI1002-01VI1008,total length 30.5-42.2mm,standard length 26.0-36.8mm.All type specimens are deposited in Fish Collection Room,College of Life Science,South China Normal University,Guangzhou,China.The total length of the new species is 30.5-67.0mm,and the standard length 26.0-55.0mm.D ii-7;P i-15;V i-8;A iii-6.Gill rakers on outer of the first arch 7,lower pharyngeal teeth 1 row 5/5.Lateral line incomplete,lateral line scales 7-15,and lateral row scales 35 6.5/5 36.Depth in standard length is 4.34-5.72（mean 5.0）,head 3.70-4.36（3.99）,caudal length 4.00-4.74（4.34）,and caudal depth 9.43-13.0（10.57）.Snout in head length is 3.32-4.58（3.95）,eye diameter 2.80-3.54（3.25）,interorbital space 2.52-3.04（2.71）.Caudal peduncle depth in caudal peduncle length 2.07-2.86.Body elongated and laterally compressed.The body depth is shorter than the head length,and the caudal depth is shorter than the head length after the eyes.The dorsal profile is a bit convex.Snout point,mouth oblique and superior,lower jaw located before upper jaw,no barbel on jaws.Nostrils just in front of eyes,nasal valves developed.Eyes large,its diameter is obviously longer than the snout length.The circular orbital bones degenerated into pole-like except for lachrymal bones which were large and sticklike.Gill membranes connected to isthmus just below the post-edge of preoperculars.Profile of the outer margin of dorsal fin with moderately concave,and the last unbranched fin-ray of dorsal fin is soft.The origin of dorsal fin is located about in middle of body and before the origin of ventral fin;the distance from the origin of dorsal fin to snout and the one to caudal fin are nearly the same.Pectoral fin not reached backward the origin of ventral fin,while the ventral fin reached backward the origin of anal fin.The caudal fin is forked with an obtuse end.Scales moderate size and those above or below lateral line are a bit larger.Its lateral line is incomplete,stopping at the 7-15 scales.The body reserved in alcohol is light celadon,a dark longitudinal strip exists from snout origin to the terminal of caudal peduncle,fins are light dark except the anal fin is light gray.