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首页> 外文期刊>Geodiversitas >Albanerpetontid Amphibians from the Upper Cretaceous (Campanian and Maastrichtian) of North America
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Albanerpetontid Amphibians from the Upper Cretaceous (Campanian and Maastrichtian) of North America

机译:来自北美上白垩纪(坎帕克和马斯特里赫特)的信天翁两栖动物

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摘要

Three Late Cretaceous albanerpetontids are identified, diagnosed, and described herein based on jaws and frontals from the North American Western Interior: Albanerpeton nexuosus Estes, 1981 and A. galaktion Fox & Naylor, 1982 (both Campanian and Maastrichtian) and A. gracilis n. sp. (middle Campanian). Membership of each in Albanerpeton Estes & Hoffstetter, 1976 is founded on diagnostic character states of the frontals and on premaxillary synapomorphiesthat diagnose less inclusive clades in the genus. A. nexuosus is a member of the robust-snouted clade, whereas A. galaktion and A. gracilis n. sp. belong in the gracile-snouted clade. Species of Albanerpeton appear to have evolved largely in isolation through the Late Cretaceous in the Western Interior. Although the three species were broadly sympatric, differences in cranial structure and inferred body size imply that each favored a different ecological niche.
机译:根据北美西部内陆的颌骨和额叶,本文确定,诊断和描述了三种晚白垩世的albanerpetontids:1981年Estes的Albanerpeton nexuosus 和 A。福克斯和内罗尔(1982)(Campanian和Maastrichtian)和 A。细纹 sp。 (Campanian中部)。 1976年的 Albanerpeton Estes&Hoffstetter中的每一个成员都是基于额叶的诊断性状和上颌前突触来诊断属中包容性较弱的分支。 A。 nexuosus 是稳健的鼻部进化支的成员,而 A。 和 A。细纹 sp。属于带鼻子的分支。 Albanerpeton 的物种似乎主要是通过西部内陆的白垩纪晚期孤立地演化的。尽管这三个物种是广泛同伴的,但颅骨结构和推断的体型差异表明它们各自偏爱不同的生态位。

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