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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >The oldest modern therian mammal from Europe and its bearing on stem marsupial paleobiogeography
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The oldest modern therian mammal from Europe and its bearing on stem marsupial paleobiogeography

机译：欧洲最古老的现代兽类哺乳动物及其对茎有袋动物古生物地理的影响

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摘要

We report the discovery of mammalian tribosphenic teeth from the basal Cenomanian of southwestern France that we refer to a new primitive marsupial-like form identified as a basal taxon of Mar-supialiformes, a new clade recognized here to include the crown group Marsupialia and primitive stem lineages more closely related to Marsupialia than to Deltatheroida. Arcantiodelphys marchandi gen et sp nov. shares several significant marsupial-like features (s.l.) with marsupialiform taxa known from the North American Mid-Cretaceous. Among marsupialiforms, it shows a closer resemblance to Dakotadens. This resemblance, which is plesiomorphic within "tribotherians," makes Arcantiodelphys one of the most archaic known Marsupialiformes. Moreover, Arcantiodelphys is characterized by an original and precocious crushing specialization. Both the plesiomorphic and autapomorphic characteristics of Arcantiodelphys among Marsupialiformes might be explained by an Eastern origin from Asian stem metatherians, with some in situ European evolution. In addition, the presence of a mammal with North American affinities in western Europe during the early Late Cretaceous provides further evidence of a large Euramerican bio-geographical province at this age or slightly before. Concerning the paleobiogeographical history of the first stem marsupialiforms during the Albian-Cenomanian interval, 2 possible dispersal routes from an Asian metatherian ancestry can be proposed: Asia to Europe via North America and Asia to North America via Europe. The main significance of the Archingeay-Les Nouillers mammal discovery is that it indicates that the beginning of the stem marsupialiforms history involved not only North America but also Europe, and that this early history in Europe remains virtually unknown.
机译：我们报告了从法国西南部的基底切诺曼尼亚人发现的哺乳动物三尖齿的牙齿，我们指的是一种新的类似有袋动物的原始形式，被确定为Mar-supialiformes的基底分类群，这里是一个新的进化枝，包括冠群Marsupialia和原始茎与有袋动物关系较与三角洲关系更密切。 Arcantiodelphys marchandi gen et sp nov。与北美白垩纪已知的袋状类群有几个重要的类似袋状的特征（s.l.）。在有袋动物中，它与达科他登氏动物更相似。这种相似性在“ tribotherians”中是拟形的，使Arcantiodelphys成为最古老的已知有袋动物之一。此外，Arcantiodelphys的特色是原始和早熟的粉碎专业技术。袋状动物中弧菌的多形和共形特征可能是由东方起源于亚洲茎状脉络动物的原因，以及欧洲的一些原位演化所解释的。此外，在白垩纪晚期，在西欧存在着具有北美亲缘关系的哺乳动物，这进一步证明了在这个年龄或更早的时期有一个大型的欧洲生物地理省。关于阿尔比亚-切诺曼尼亚时期的第一个茎状有袋动物的古地理地理历史，可以提出两种可能的传播途径，这些途径可能来自亚洲的陨石血统：亚洲通过北美到欧洲和亚洲通过欧洲到北美。 Archingeay-Les Nouillers哺乳动物发现的主要意义是，它表明茎有袋动物的起源不仅涉及北美，而且涉及欧洲，而欧洲的这一早期历史实际上仍然未知。

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  • 作者

    Romain Vullo; Emmanuel Gheerbrant; Christian de Muizon; Didier Neraudeau;

  • 作者单位

    Unidad de Paleontologia, Departamento de Biologfa, Calle Darwin, Universidad Autonoma de Madrid, Cantoblanco, 28049 Madrid, Spain Universite de Rennes 1, Unite Mixte de Recherche Centre National de la Recherche Scientifique 6118, Campus de Beaulieu, 35042 Rennes, France;

    UMR 7207 du Centre National de la Recherche Scientifique - CR2P Centre de Recherches sur la Paleobiodiversite et les Paleoenvironnements, CP 38, Museum national d'Histoire naturelle, 75005 Paris, France;

    UMR 7207 du Centre National de la Recherche Scientifique - CR2P Centre de Recherches sur la Paleobiodiversite et les Paleoenvironnements, CP 38, Museum national d'Histoire naturelle, 75005 Paris, France;

    Universite de Rennes 1, Unite Mixte de Recherche Centre National de la Recherche Scientifique 6118, Campus de Beaulieu, 35042 Rennes, France;

  • 收录信息 美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    cretaceous; mammals; marsupialiformes nov;

    机译：白垩纪哺乳动物形变;

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