First monotreme from the Late Cretaceous of South America.

First monotreme from the Late Cretaceous of South America.
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DOI:
10.1038/s42003-023-04498-7
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发表时间:
2023-02-16
影响因子:
5.9
通讯作者:
--
中科院分区:
生物学2区
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单孔动物是一个卵生哺乳动物的分支,以现存的鸭嘴兽和针鼹为代表,是澳大利亚和邻近岛屿的特有物种。在早白垩世的澳大利亚发现了基生单孔目动物,这使得人们一致认为这个分支起源于该大陆,后来到达南美洲。在这里,我们报告的晚白垩世单孔类从阿根廷南部的发现,证明单孔类是目前在极地地区的中生代结束时,他们独特的解剖特征可能存在于这些古老的形式以及。阿根廷晚白垩世的一颗孤立的牙齿表明,中生代末南美洲存在单孔目动物。
Monotremata is a clade of egg-lying mammals, represented by the living platypus and echidnas, which is endemic to Australia, and adjacent islands. Occurrence of basal monotremes in the Early Cretaceous of Australia has led to the consensus that this clade originated on that continent, arriving later to South America. Here we report on the discovery of a Late Cretaceous monotreme from southern Argentina, demonstrating that monotremes were present in circumpolar regions by the end of the Mesozoic, and that their distinctive anatomical features were probably present in these ancient forms as well. An isolated tooth from the Late Cretaceous of Argentina indicates a monotreme presence in South America by the end of the Mesozoic.
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