一种长期被误鉴的中国新纪录鱼类——大鳍弹涂鱼

通过形态特征的测量和线粒体DNAcyt b基因序列分析,发现了弹涂鱼属的1个中国新纪录种,大鳍弹涂鱼Periophthalmus magnuspinnatus.新纪录种与中国近缘种弹涂鱼P.modestus的主要形态区别为:第1背鳍大而高,第1鳍棘呈丝状延长,各鳍棘尖明显伸出鳍膜;第2背鳍各鳍棘中部以下颜色均一,无黑斑;第1背鳍和第2背鳍基部之间间距较小;左右腹鳍基部愈合处凹陷较浅.序列分析表明,新纪录种与形态近似种弹涂鱼P.modestus的cyt b基因全序列平均K 2-P遗传距离高达17.3%,在分子系统树上也聚为分别属于两个不同的支序,证实了新纪录种的有效性.新纪录种在中国的渤海、黄海、东海和南海的沿海都有分布记录.

A LONG-TERM MISIDENTIFIED NEW RECORD SPECIES OF GOBIIDAE FROM CHINA-PERIOPHTHALMUS MAGNUS PINNA TUS

A new record species of Gobiidae,Periophthalmus magnuspinnatus was found by the comparison of the morphological characters and mitodondrial cytochrome b gene sequences. P. magnuspinnatus is distinguished from the other related congeners by the following characters: the first dorsal fin relatively large, convex and elevated. The first dorsal rags fin prolonged, when depressed it can reach second dorsal origin. Colors below the posterior dorsal rags fin are identical and no black spots on them. The distance from anterior to posterior dorsal fin base (the distance between the two dorsal fins) was relatively short. The base of the two ventral fins united and concaved narrowly. Sequences analysis of the cyt b gene showed that the average kimura 2-parameter distance (K 2-P) between P. magnuspinnatus and P. modestus reached 17.3% and the two species clustered into two distinct monophyletic clades in the molecular phylogenetic tree. These also supported P. magnuspinnatus as a valid species. The new record species distributed in the coasts of Bohai sea, Yellow sea, East China sea and South China sea.