The distribution of the loach Paracobitis variegatus is confined to upper Yangtze, Huanghe and Nanpanjiang drainages. The number of branched dorsal fin rays, morphology of anterior nostril, colour pattern of head...The distribution of the loach Paracobitis variegatus is confined to upper Yangtze, Huanghe and Nanpanjiang drainages. The number of branched dorsal fin rays, morphology of anterior nostril, colour pattern of head and the length of maxillary barbel indicate that it has differentiated into two subspecies. Both subspecies are isolated geographically: P. variegatus variegatus restricted to the upper Yangtze and the upper Huanghe Rivers, and P. variegatus longidorsalis, new subspecies, to the upper Nanpanjiang River. The subspecific differentiation is supposed to correlated to the sharp uplift of the eastern Yunnan Plateau during late Pleistocene. The taxonomic status of Nemachilus berezowsku Gunther, 1896 and Nemacheilus oxygnathus Regan, 1908 are also discussed and they are considered to be the synonyms of P. variegatus variegatus.展开更多
采用长PCR和嵌套PCR相结合的方法测定并注释了红尾副鳅Paracobitis variegatus(Dabry de Thiersant,1874)线粒体基因组全序列.结果表明:红尾副鳅线粒体基因组全长16 571bp,A+T含量55.6%,基因构成及排列与其他硬骨鱼基本相同,包含37个基...采用长PCR和嵌套PCR相结合的方法测定并注释了红尾副鳅Paracobitis variegatus(Dabry de Thiersant,1874)线粒体基因组全序列.结果表明:红尾副鳅线粒体基因组全长16 571bp,A+T含量55.6%,基因构成及排列与其他硬骨鱼基本相同,包含37个基因和1个控制区(D-loop区).基因组结构紧密,除控制区外基因间仅存在63bp的间隔,33bp的重叠.13个蛋白质编码基因中,除了COI基因以GTG作为起始密码子,COII、COIII和Cyt b以不完整的T,ND4基因以不完整的TA作为终止密码子外,大都以典型的ATG作为起始密码子,以TAA或TAG作为终止密码子.22个tRNA基因的二级结构中,除了tRNASer(AGN)外,其余21个都可以折叠成典型的三叶草结构,tRNASer(AGN)缺失了DHU臂,在相应位置上只形成一个环.预测了rRNA的二级结构,其中12SrRNA包含43个茎环结构,16SrRNA包含6个结构域,53个茎环结构.控制区包含1个终止相关序列TAS1、3个中央保守序列(CSB-F、CSB-D、CSB-E)、2个保守序列区(CSB-2、CSB-3).展开更多
文摘The distribution of the loach Paracobitis variegatus is confined to upper Yangtze, Huanghe and Nanpanjiang drainages. The number of branched dorsal fin rays, morphology of anterior nostril, colour pattern of head and the length of maxillary barbel indicate that it has differentiated into two subspecies. Both subspecies are isolated geographically: P. variegatus variegatus restricted to the upper Yangtze and the upper Huanghe Rivers, and P. variegatus longidorsalis, new subspecies, to the upper Nanpanjiang River. The subspecific differentiation is supposed to correlated to the sharp uplift of the eastern Yunnan Plateau during late Pleistocene. The taxonomic status of Nemachilus berezowsku Gunther, 1896 and Nemacheilus oxygnathus Regan, 1908 are also discussed and they are considered to be the synonyms of P. variegatus variegatus.
