ABSTRACT

A chimaeroid species, Edaphodon eyrensis Long, 1985 (Holocephali, Chimaeroidei), from the Lower Cretaceous Bulldog Shale of the Eromanga Basin, South Australia, is reassessed as Ptyktoptychion eyrensis (Long, 1985), comb. nov. This is the oldest representative of the endemic Australian chimaeroid genus Ptyktoptychion Lees, 1986. An ancestor of this genus could be the Early Cretaceous chimaeroid Ischyodus thurmanni Pictet and Campiche, 1858 from the northern hemisphere. Ptyktoptychion eyrensis survived in Australia in southern polar environment conditions.

摘要

来自南澳大利亚州埃罗曼加盆地下白垩统牛头犬页岩的一种类ma体Edaphodon eyrensis Long，1985年（Holocephali，Chimaeroidei）被重新评估为Ptyktoptychion eyrensis（Long，1985年）。十一月 这是1986年澳大利亚特有类ma类动物Ptyktoptychion Lees的最古老代表。该类的祖先可能是北半球的早白垩世类ma类动物Ischyodus thurmanni Pictet和Campiche。在南部极地环境条件下，澳大利亚的Ptyktoptychion eyrensis得以生存。