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首页> 外文期刊>Acta Palaeontologica Polonica >Highly derived eutherian mammals from the earliest Cretaceous of southern Britain
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Highly derived eutherian mammals from the earliest Cretaceous of southern Britain

机译：来自英国南部最早的白垩纪的高度衍生的Eutherian哺乳动物

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Eutherian mammals (Placentalia and all mammals phylogenetically closer to placentals than to marsupials) comprise the vast majority of extant Mammalia. Among these there is a phenomenal range of forms and sizes, but the origins of crown group placentals are obscure. They lie within the generally tiny mammals of the Mesozoic, represented for the most part by isolated teeth and jaws, and there is strongly conflicting evidence from phenomic and molecular data as to the date of origin of both Eutheria and Placentalia. The oldest purported eutherians are Juramaia from the Upper Jurassic of China, and Eomaia and Acristatherium from the Lower Cretaceous, also of China. Based on dental characters and analyses of other morphological and molecular data, doubt has recently been cast on the eutherian affinities of the Chinese taxa and consequently on the date of emergence of Eutheria. Until now, the only tribosphenic mammal recorded from the earliest Cretaceous (Berriasian) Purbeck Group of Britain was the stem tribosphenidan Tribactonodon. Here we document two new tribosphenic mammals from the Purbeck Group, Durlstotherium gen. nov. and Durlstodon gen. nov., showing highly derived eutherian molar characters that support the early emergence of this clade, prior to the Cretaceous.
机译：Eutherian哺乳动物（胎盘和胎儿的所有哺乳动物更接近胎盘而不是Massupial）都包括绝大多数现存哺乳动物。其中有一种形式和尺寸的现象范围，但胎冠胎盘的起源是模糊的。它们位于中生代的一般微小的哺乳动物内，由孤立的牙齿和颌骨大部分表示，并且从表情和分子数据到eutheria和砾石的起源日期存在强烈矛盾的证据。最古老的据称埃德兰人是来自中国上部侏罗纪的茱莉亚，以及来自中国的下白垩纪的艾玛西亚和临床。基于牙科性格和其他形态和分子数据的分析，最近在中国分类群的陪同性亲盟的亲和力施加了疑问，因此在埃夫坦的出现之日起。到目前为止，英国最早的白垩纪（Berriasian）普贝克群中唯一记录的休膦哺乳动物是茎孢族毒蛇二托管。在这里，我们将来自Purebeck Group的两种新的培训哺乳动物造成Durlstotherium Gen。 11月。和Durlstodon Gen。 11月。，显示在白垩纪之前支持这一思工的早期出现的高度衍生的Eutherian摩尔人物。

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