First Fossil Lamprey: A Record from the Pennsylvanian of Illinois
First Fossil Lamprey: A Record from the Pennsylvanian of Illinois
复制标题
第一个七鳃鳗化石：来自伊利诺伊州宾夕法尼亚州的记录
作者：
D. Bardack;R. Zangerl
七鳃鳗的化石记录以前是未知的。一个新的属证明了该群体在宾夕法尼亚州的存在。身体轮廓、部分头部骨骼、锉舌机构、鳃篮等内脏均保存完好。这些化石的结构与现代形式非常相似。化石中没有盲鳗特征，这支持了七鳃鳗和盲鳗的共同祖先生活在宾夕法尼亚人之前的观点。
A fossil record of lampreys has previously been unknown. A new genus demonstrates the presence of this group in the Pennsylvanian. The body outline, parts of the head skeleton, rasping tongue mechanism, gill basket, and other internal organs are preserved. The fossils are very similar in structure to modern forms. The absence of hagfish characters in the fossil supports the view that the common ancestor of lampreys and hagfishes lived prior to the Pennsylvanian.