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Pachyrhizodus caninus COPE, 1872 (Teleostei, Crossognathiformes) from the early Turonian of Vallecillo (Mexico)

机译:Pachyrhizodus caninus COPE,1872年(Teleostei,Crossognathiformes)来自瓦雷西约(墨西哥)的早期突尼斯人

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摘要

In this paper we report on a specimen of Pachyrhizodus caninus COPE, 1872 (Teleostei, Crossognathiformes) from the early Turonian of Vallecillo (North-eastern Mexico). P caninus is considered to be a typical faunal element of the Western Interior Seaway, however, its occurrence in Vallecillo shows that this species was not restricted to the Seaway realm. The described specimen is the stratigraphically oldest record of this species. Comparisons with the European type species Pachyrhizodus basalis (DIXON, 1850) show that both P caninus and P basalis are valid species. The occurrence of a Western Interior faunal element in the assemblage of Vallecillo underlines the importance of this locality in understanding the palaeobiogeographical relations of the Western Tethys and adjacent realms in the late Cretaceous.
机译:在本文中,我们报告了来自Vallecillo早期土伦时代(墨西哥东北部)的Pachyrhizodus caninus COPE,1872年(Teleostei,Crossognathiformes)的标本。 P caninus被认为是西部内陆航道的典型动物区系元素,但是,它在Vallecillo的发生表明该物种并不局限于Seaway境界。所描述的标本是该物种在地层上最古老的记录。与欧洲类型的Pachyrhizodus basalis(DIXON,1850)的比较表明,P caninus和P basalis都是有效的物种。在Vallecillo的组合中出现了一种西部内部动物区系元素,突显了该地区在了解白垩纪晚期西提提斯和邻近地区的古生物地理关系中的重要性。

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