中国青鳉属鱼类新纪录:鳍斑青鳉

A New Record Species of Ricefishes in China: Oryzias pectoralis

2015年11月在中国广西省靖西市龙江河(22°59′25″N,106°21′50″E,海拔664 m)采得青鳉属鱼类30尾,经鉴定为中国鱼类新纪录种——鳍斑青鳉(Oryzias pectoralis Roberts,1998)。其主要鉴别特征为:体形细长而侧扁;胸鳍基部具黑色斑块;背鳍和臀鳍鳍条无角化延伸;尾鳍末端呈圆弧状;尾鳍上下边缘的鳍条呈橙黄色。通过设计简并引物进行PCR扩增得到CO1基因序列,以其657 bp序列与同属其他种比较并构建邻接进化树,以斑马鱼(Danio rerio)和食蚊鱼(Gambusia affinis)为外群,所得系统树支持形态鉴定结果。该鱼标本现保存于湖南师范大学生命科学学院脊椎动物标本室。

Oryzias pectoralis was identified from more than thirty ricefishes captured from the Long-Jiang in Jingxi County, Guangxi Zhuang Autonomous Region, South China in November, 2015, which represents a newly recorded distribution of the species in China. This ricefish has the following main characteristics： body slender compressed laterally; a prominent black plaque presents on the pectoral-fin base; no prolonged filamentous addition to distal ends of dorsal and anal-fins; caudal fin rounded, a yellow to orange submargin stripe among each caudal-fin lobe. The phylogenetic tree constructed by NJ method based on CO1 gene supports the results of morphological identification. The characteristics data of O. pectoralis obtained by X ray and morphometry were compared with those of O, sinensis, O. latipes, O. minutillus, O. curvinotus and O pectoralis from Vietnam respectively. All specimens examined were deposited in the fish collection at the college of life science, Hunan Normal University, Changsha, China.