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首页> 外文期刊>Proceedings of the Royal Society. Biological sciences >A new Palaeocene crocodylian from southern Argentina sheds light on the early history of caimanines
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A new Palaeocene crocodylian from southern Argentina sheds light on the early history of caimanines

机译：来自阿根廷南部的一位新的古兔鳄鱼揭示了Caimanines的早期历史

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摘要

Caimanines are crocodylians currently restricted to South and Central America and the oldest members are from lower Palaeocene localities of the Salamanca Formation (Chubut Province, Argentina). We report here a new caimanine from this same unit represented by a skull roof and partial braincase. Its phylogenetic relationships were explored in a cladistic analysis using standard characters and a morphogeometric two-dimensional configuration of the skull roof. The phylogenetic results were used for an event-based supermodel quantitative palaeobiogeographic analysis. The new species is recovered as the most basal member of the South American caimanines, and the Cretaceous North American lineage 'Brachychampsa and related forms' as the most basal Caimaninae. The biogeographic results estimated north-central North America as the ancestral area of Caimaninae, showing that the Cretaceous and Palaeocene species of the group were more widespread than thought and became regionally extinct in North America around the Cretaceous-Palaeocene boundary. A dispersal event from northcentral North America during the middle Late Cretaceous explains the arrival of the group to South America. The Palaeogene assemblage of Patagonian crocodylians is composed of three lineages of caimanines as a consequence of independent dispersal events that occurred between North and South America and within South America around the Cretaceous-Palaeogene boundary.
机译：Caimanines是目前仅限于南部和中美洲的鳄鱼，最古老的成员来自萨拉曼卡群体的较低古世教地区（阿根廷楚鲁省）。我们在这里报告一个由骷髅屋顶和部分脑壳代表的同一单元的新凯琳。利用标准字符和头部屋顶的示例性二维配置，在钢板分析中探讨了其系统发育关系。系统发育结果用于基于事件的超导定量古奥基脲地产分析。新物种被恢复为南美洲凯塞尼的最基本成员，以及白垩纪北美谱系'Brachymampsa和相关的形式是最基的凯联尼。生物地理结果估计北美洲北美洲作为凯撒奈的祖先地区，表明该组织的白垩纪和古代物种比思想更广泛，并在白垩纪 - 古教物边界周围地区灭绝。中央北美洲在中部白垩纪中的一个分散事件解释了集团到南美洲的到来。巴塔哥尼亚州鳄鱼的古烯族大会是由北美洲和南美洲之间发生的独立分散事件的三个​​凯纳内的谱系组成。

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