金线鲃属（Sinocyclocheilus）为中国鲤科（Cyprinidae）最大属，目前记载有效种50 余种，广泛分布于云南东部、贵州中南部及广西壮族自治区西北部和北部等地区。其中，26种分布于云南。云南文山州是典型的喀斯特发育地区，洞穴鱼类资源丰富，截至目前共记录洞穴鱼类约10种，且分布区均属南盘江水系，主要集中于丘北和砚山两地的龙潭和河流。
该研究将2009年9 月12 日于云南省西畴县畴阳河（红河水系）一洞穴采集到的金线鲃标本鉴定为金线鲃属一新种——西畴金线鲃属。本种是目前所有记载的金线鲃属鱼类分布最南的种类， 位于北回归线以南。
该研究成果已发表于《动物学研究》34卷第4期，原文链接为：http：//www.zoores.ac.cn/CN/abstract/abstract3367.shtml。该研究得到了中国科学院昆明动物研究所“一三五”重大专项的资助。（生物谷Bioon.com）
doi:10.11813/j.issn.0254-5853.2013.4.0368
PMC:
PMID:
Sinocyclocheilus xichouensis, a new species of golden-line fish from the Red River drainage in Yunnan, China (Teleostei: Cypriniformes)
Xiao-Fu PAN1, Lie LI2, Jun-Xing YANG1, Xiao-Yong CHEN1
In the present study, a new species of the genus Sinocyclocheilus Fang 1936, Sinocyclocheilus xichouensis, was described from the Ganhaizi tributary of Chouyang River, Red River drainage, located in southeast Yunnan, China. This species has normal eyes and a strong dorsal spine with serrations on the lower 3/5 part. In general, this species is similar in morphology to S. macrophthalmus, S. guishanensis, S. angustiporus, S. lateristritus, S. qiubeiensis, S. grahami, S. qujingensis, S. maculatus and S. purpureus distributed in the Nanpanjiang River, and S. qiubeiensis distributed in the Red River. It is distinguished from S. macrophthalmus by possessing fewer than 9 gill rakers. However, S. xichouensis can be distinguished from S. guishanensis by its interorbital width/SL of 8.1~9.9%, rostral barbels extended to posterior margin of eye and maxillary barbels extended to posterior preopercular. It is distinct from S. lateristritus by dorsal-fin origin opposite of pelvic fin origin, with no a black stripe along the lateral line. It is distinguished from S. grahami by 74~88 lateral-line scales, 20 scale rows above the lateral line, and 16 scale rows below the lateral line. It is distinguished from S. qujingensis by a curved lateral line, 74-88 lateral-line scales, 48 circumpeduncular scales. It can be distinguished from S. yimenensis by the ratio of predorsal length, dorsal-fin base length, preanal length, anal fin length, prepectoral length, caudal-peduncle length and lower jaw length to SL, 47.1%-53.7%, 12.8%-15.8%, 66.0%-71.0%, 13.7%-17.1%, 26.0%-29.5%, 19.3%-24.7%, 4.7%-7.0%, respectively. It is distinguished from S. maculatus and S. purpureus by possession of lateral line and scaled body and distinguished from S. angustiporus and S. qiubeiensis by 35~39 predorsal scales, 6 gill rakers, and interorbital width/SL of 8.1%-9.9%.
