高原特有条鳅鱼类两新种在广西的发现及其动物地理学意义  

Occurrence of Two New Plateau-indicator Loaches of Nemacheilinae (Balitoridae) in Guangxi with Reference to Zoogeographical Significance

作　　者：杨君兴[1] 陈小勇[1] 蓝家湖 

机构地区：[1]中国科学院昆明动物研究所,云南昆明650223 [2]广西都安县畜牧水产局,广西都安530700

出　　处：《Zoological Research》2004年第2期111-116,共6页动物学研究（英文）

基　　金：中国科学院知识创新重要方向项目 (KSCX2 -1-0 6A)

摘　　要：描述了采自广西都安县红水河水系的条鳅亚科鱼类 2个新种 :丽纹云南鳅Yunnaniluspulcherrimussp nov .在侧线长度、鳞片分布、鳍条数目、尾型、吻须长度等方面与侧纹云南鳅Yunnaniluspleurotaenia (Re gan ,190 4 )最为相似 ,但新种独特的斑纹和上下唇的长乳突可明显与之区别 ,二者在一些度量特征上也有区别。黄体高原鳅Triplophysaflavicorpussp nov 与同分布于西江水系的南丹高原鳅T .nandanensisLanetal 较为相似 ,并以下列特征组合与高原鳅属所有已知种相区别 :背鳍分枝鳍条 10根、臀鳍分枝鳍条 6～ 7根、体被细鳞、侧线完全、具 6条宽横斑和 1条沿侧线的细纵纹、尾鳍深分叉、尾鳍基具 1半圆形黑斑、尾鳍上下叶各具2条黑色横斑、腹鳍末端后伸超过肛门、腋部具发达的肉质鳍瓣、上唇中央完全中断等。云南鳅属和高原鳅属均是高原特有类群 ,前者仅分布于云南东中部地区 ,后者则集中分布于青藏高原。两个新种的分布地均远离这两个属的分布中心 ,而且呈间断分布。通过各自相近种谱系关系分析 ,推测这种特殊的分布格局是通过隔域分化形成的。Two new loaches of subfamily Nemacheilinae have been recognized on basis of collections from Hongshuihe River,a tributary of Xijiang in Du'an County,Guangxi,China.All type specimens of Yunnanilus pulcherrimus sp.nov.(Holotype:KIZ 995001,39 6 mm SL) were collected from an underground river,and had diagnosis characters:dorsal fin 3,8-9 (occasionally 3,9);anal fin 3,5-6 (occasionally 3,6);pectoral fin 1,8-10;pelvic fin 1,6-7 (occasionally 1,6);branched caudal fin rays 14-16 (occasionally 14);gill rakers 11-12 on the inner side of 1st gill arch;vertebrae (1 ex ) 4+29.The new species is closely related to Yunnanilus pleurotaenia (Regan,1904) in length of lateral line,pattern of scale coverage,count of fin rays,shape of caudal fin and length of rostral barbels,but can be distinguished from all congeners by its unique color pattern and the elongated papillae on upper and lower lips,and can be further distinguished from Y.pleurotaenia by some morphometric characters:standard length/body depth 4 3-5 6 (5 0) vs.3 9-4 9 (4 2),standard length/head length 4 4-5 1 (4 7) vs.3 7-3 9 (3 8),standard length/caudal peduncle length 5 7-7 1 (6 3) vs.7 7-9 1 (8 4),head length/snout length 2 7-3 5 (3 0) vs.2 5-2 8 (2 6),caudal peduncle length/depth 1 2-1 7 (1 4) vs.1 1-1 2 (1 1).All type specimens of Triplophysa flavicorpus sp.nov.(Holotype:KIZ 995004,76 4 mm SL) were diagnosticated by characters:dorsal fin 3,10;anal fin 3,6-7;pectoral fin 1,11;pelvic fin 1,6-7 (occasionally 1,6);branched caudal fin rays 8+8;gill rakers 5-9 on the outer side and 11-12 on the inner side of 1st gill arch;vertebrae (1 ex ) 4+34.The new triplophysid species is closely related to Triplophysa nandanensis Lan et al .1995 by dorsal fin origin at mid point of body,lateral line complete and deep forked caudal fin,and can be easily distinguished from all congeners by following characters:10 branched dorsal fin rays,6-7 branched anal fin rays,body covered by tiny scales,lateral line complete

关 键 词：条鳅鱼类 种 广西 动物地理 条鳅亚科 

分 类 号：Q958[生物学—动物学]