A Revision of the African Silurid Fishes of. the Subfamily Clariin.
A Revision of the African Silurid Fishes of. the Subfamily Clariin.
复制标题
非洲鲶鱼的修订。
DOI：
10.1111/j.1469-7998.1907.tb06968.x
复制
发表时间：
2009
影响因子：
1.9
通讯作者：
G. Boulenger
中科院分区：
文献类型：
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作者：
G. Boulenger
Clwiinae 亚科的鲶鱼是非洲淡水中最有趣但同时也是最困难的鱼群之一。许多克拉丽亚属物种的关系如此密切，如此难以定义，并且在被认为是特定的性状上表现出如此多的个体差异，以至于我感到有必要开始他们的研究，就好像它们以前从未被划分过一样。我希望我现在提出的修订将使该物种的确定建立在更健全的基础上。从进化的角度来看，该组特别令人感兴趣，Clarias-AUobenchel 系列？ ls-CCklriaUabes-GynkiaaL labes-Channallabes 形成了一个可称为正交遗传系列*，从更典型的燕麦鱼到真正的鳗鱼鱼，几乎链中的每个环节都连接着两个极端。其中一些类型在相邻的文字图上表示。在本系列中，通过身体尾部的伸长，同时背鳍和臀鳍与尾鳍的融合，以及成对鳍的减少和最终抑制，首先是腹鳍，然后是胸鳍，达到了鳗鱼形状。与此同时，有效保护典型克拉里亚头部的骨盾逐渐减少，直到完全抑制在最细长的形式中，
Tlie Silurid Fishes of the Subfamily Clwiinae are one of the most interesting, but at the same time most difficult groups of the African fresh waters. Many of the species of Clarias are so closely related, so diflicult to define, and show so much individual variation in characters which have been regarded as specific, that I have felt compelled to take up their study as if they had never been chisifled before. I hope the revision which I now offer will phce the determination of the species on a sounder footing. The group is of special interest from an evolutionary point of view, the series Clarias-AUobenchel? ls-CCklriaUabes-GynkiaaL labes-Channallabes forming what may be termed an orthogenetic series* leading from a more typical Oat-fish to one that is truly Eel-like, with almost every link in the chain connecting the two extremes. A few of these types are represented on the subjoined text-figures.The eel-shape has been reached, in this series, by an elongation of the caudal part of the body concurrently with the fusion of the dorsal and anal fins with the caudal, and the reduction and final suppression of the paired fins, the ventrals first, followed by the pectorals. At the same time the bony buckler which so efficiently protects the head of the typical Clarias has been gradually reduced until its complete suppression in the most elongate forms,