A review of the Carboniferous lungfish genus Ctenodus Agassiz, 1838 from the United Kingdom, with new data from an articulated specimen of Ctenodus interruptus Barkas, 1869
A review of the Carboniferous lungfish genus Ctenodus Agassiz, 1838 from the United Kingdom, with new data from an articulated specimen of Ctenodus interruptus Barkas, 1869
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对石炭纪肺鱼属 Ctenodus Agassiz 的回顾，1838 年来自英国，以及来自 Ctenodus Interruptus Barkas 关节标本的新数据，1869 年
DOI：
10.1017/s1755691013000479
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发表时间：
2013
影响因子：
1.2
通讯作者：
J. Clack
中科院分区：
文献类型：
--
作者：
E. Sharp;J. Clack
对石炭纪肺鱼属Ctenodus进行了订正。Ctenodus是石炭纪存活时间最长的肺鱼属，也是唯一一个跨越下-上石炭纪界线的物种。五个物种跨越的时期，与物种的阶段。物种的区别在于齿板形态的差异。从图尔奈阶到莫斯科阶，脊数增加，长宽比减小。一个新的，几乎完整的C。interruptus允许通过翼状齿板和其他特征来鉴定该物种。这些，和新的特点，颅后骨骼，描述的第一次。栉齿龙保留了头骨顶部的原始特征，例如一对C形骨和一个D形骨;它的同时代人Conchopoma，Sagenodus和Straitonia显示了这些特征的衍生条件。栉齿鲨保留了鳞毛类的原始特征，即末端分节和分叉。然而，它也显示了尾部区域的衍生条件，在有一个合并的第一和第二背鳍：是否有一个单独的尾鳍仍然未知。
ABSTRACT A revision of the Carboniferous lungfish genus Ctenodus is undertaken. Ctenodus is the longest-surviving genus of lungfish from the Carboniferous, and is the only one to cross the Lower–Upper Carboniferous boundary. Five species span the period, with species correlated to stage. Species are distinguished by differences in tooth plate morphology. Ridge number increases from the Tournaisian to the Moscovian, and the length to width ratio decreases. A new, almost complete articulated individual of C. interruptus allows identification of this species from pterygoid tooth plates and other characteristics. These, and new features of the postcranial skeleton, are described for the first time. Ctenodus retains primitive features of the skull roof, such as a pair of C-bones and retention of a D-bone; its contemporaries Conchopoma, Sagenodus and Straitonia show the derived condition of these features. Ctenodus retains primitive features of the lepidotrichia, which are distally segmented and bifurcated. However, it also shows the derived condition of the tail region in having a combined first and second dorsal fin: whether there was a separate caudal fin remains unknown.