中国大陆沿海鲆科新记录属--线鳍鲆属(Taeniopsetta)和新纪录种--眼斑线鳍鲆(Taeniopsetta ocellata)

A new record genus--Taeniopsetta and species--Taeniopsetta ocellata of Bothidae from the coastal waters of China's Mainland

2016年10月采自北部湾海域的1尾鱼类标本经鉴定为线鳍鲆属Taeniopsetta Gilbert,1905的眼斑线鳍鲆Taeniopsetta ocellata(Günther,1880),隶属于鲽形目Pleuronectiformes鲆科Bothidae,这是该属和种首次在中国大陆海域的报道。线鳍鲆属的主要形态特征包括:体长卵圆形;双眼位于头左侧;口小;有眼侧和无眼侧均有1行小尖牙;鳞细小,仅体左侧有1条侧线;雄鱼有1枚强吻棘和2或3枚眼棘,雌鱼吻棘和眼棘很钝或无;无眼侧腹鳍始于有眼侧第2根腹鳍鳍条基部右侧;腹鳍基较短;背鳍和臀鳍的部分鳍条延长成丝状。眼斑线鳍鲆的主要形态特征为:两侧胸鳍不等长;雄鱼背鳍的第13~17根鳍条及臀鳍的第1~6根鳍条延长成丝状;体左侧背腹缘分别有2~4个不规则的“V”形或半圆形中空黑色斑块,斑块内部具一黄色圆斑。

A specimen collected from the Beibu Gulf in October 2016 was identified as Taeniopsetta ocellata(Günther,1880)belonging to genus Taeniopsetta(Pleuronectiformes:Bothidae).Such genus and species are reported for the first time from the coastal waters of China's Mainland.Characters of genus Taeniopsetta mainly include the following:body ovate;both eyes on the left side of body;mouth rather small;teeth uniserial on both sides;scales small,lateral line only on ocular side,absent on blind side;one strong rostral and two or three orbital spines present in males,feeble or absent in females;first ray of ventral fins on the blind side opposite to the second ray on the ocular side;base of ventral fins short;and some of the rays of the dorsal and anal fins prolonged into filaments.The diagnostic features of T.ocellata are as follows:pectoral fins unequal on both sides;the 13th to 17th dorsal-fin rays and six anterior rays of anal fins elongated and filamentous in males;2~4 irregular V-shaped or semicircular hollow blotches within yellow spots on the upper and lower body on the ocular side.