Pachyrhizodus caninus Cope, 1872 (Teleostei, Crossognathiformes) from the early Turonian of Vallecillo (Mexico)
Pachyrhizodus caninus Cope, 1872 (Teleostei, Crossognathiformes) from the early Turonian of Vallecillo (Mexico)
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Pachyrhizodus caninus Cope, 1872（Teleostei，Crossognathiformes），产自巴列西洛（墨西哥）早期土伦阶
DOI：
10.1127/0077-7749/2010/0099
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发表时间：
2010
影响因子：
0.8
通讯作者：
Gonzalez-Gonzalez
中科院分区：
文献类型：
--
作者：
Giersch;Stinnesbeck;Gonzalez-Gonzalez
在本文中，我们报告了来自瓦莱西洛（墨西哥东北部）早期土伦阶的 Pachyrhizodus caninus COPE, 1872（Teleostei，Crossognathiformes）标本。 P. caninus 被认为是西部内陆航道的典型动物群，然而，它在瓦莱西洛的出现表明该物种并不局限于航道领域。所描述的标本是该物种最古老的地层记录。与欧洲模式种 Pachyrhizodus basalis (DIXON, 1850) 的比较表明，P. caninus 和 P. basalis 都是有效种。瓦莱西洛组合中西部内陆动物群元素的出现突显了该地点对于了解白垩纪晚期西特提斯和邻近地区的古生物地理关系的重要性。
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.