宁夏鲇属鱼类一新纪录种——兰州鲇形态学特征描述

A New Species of Catfish in Ningxia——Silurus lanzhouensis and It's Intensive Morphological Description

2003年3月至2004年5月,在黄河宁夏段采集到一批鲇鱼标本。经鉴定,为鲇属(Silurus)宁夏一新纪录种———兰州鲇(Silurus lanzhouensis)。兰州鲇(S.lanzhouensis)与小背鳍鲇(S.m icrodorsalis)、鲇(S.asotus)、大口鲇(S.m eridionalis)、昆明鲇(S.m ento)、抚仙鲇(S.graham i)相似,但也有显著区别。兰州鲇犁骨齿带左右分离,与小背鳍鲇、鲇、大口鲇犁骨齿带连续相区别;兰州鲇臀鳍鳍条77-86、脊椎骨数目63-68,可与昆明鲇臀鳍鳍条61-72、脊椎骨52-56,抚仙鲇臀鳍鳍条68-74、脊椎骨58-59相区别。此外,兰州鲇卵色为黄色,可作为与黄河中生活的鲇相区别的鉴别特征之一。

A new species of catfish was found in Yellow River in Ningxia. And it was determined as a new region record： Silurus lanzhouensis. It is similar with S. microdorsalis, S. asotus, S. meridionali, S. mento, S. grahami. However, its vomerine teeth belt is separated in two pieces, while the integrated vomerine teeth belt of S. microdorsalis, S. asotus, S. meridionali, The Silurus lanzhouensis has 77 -86 ventral fin rays, which is different from the 61 -72 ventral fin rays of S. mento, and the 68 - 71 of S. grahami; The Silurus lanzhouensis has 63 - 68 vertebrae, which is different from the 52 - 56 vertebrae of S. mento and the 58 - 59 vertebrae of S. grahami. In addition, Silurus lanzhouensis can be identified from another Yellow River catfish S. asotus by its yellow eggs.