New record of a Mesozoic gondwanatherian mammaliaform from Southern Patagonia
New record of a Mesozoic gondwanatherian mammaliaform from Southern Patagonia
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DOI：
10.1007/s00114-020-01705-x
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发表时间：
2020-11-19
影响因子：
1.8
通讯作者：
Novas, Fernando E.
中科院分区：
文献类型：
--
作者：
Chimento, Nicolas R.;Agnolin, Federico L.;Novas, Fernando E.
冈瓦纳兽是一个分布于南美洲、非洲、马达加斯加、印度和南极洲的白垩纪和古近纪的神秘的冈瓦纳兽型分支。南美洲的中生代记录仅限于阿根廷的里奥内格罗省和丘布特省以及智利南部的马加拉内斯地区的晚白垩世。本文的目的是描述一个新的冈瓦纳大陆的古生物标本，该标本产于阿根廷圣克鲁斯省埃尔卡拉法特西南30 km处的Maastrichtian Chorrillo组地层中。它是由一个单一的molariform可与Magallanodon baikashkenke物种，它分享了一个独特的特征组合。对Magallanodon所展示的独特特征组合的分析对Ferugliotheriidae的单系性提出了质疑，并建议南美洲的分类群可能彼此密切相关。冈瓦纳人广泛的地理分布和出现在不同起源的地质单元上表明他们能够面对不同的环境条件。
Gondwanatheria is an enigmatic mammaliaform clade distributed in the Cretaceous and Paleogene of South America, Africa, Madagascar, India and Antarctica. The Mesozoic record in South America is restricted to the Latest Cretaceous of Rio Negro and Chubut provinces, Argentina and Magallanes Region of southern Chile. The aim of the present contribution is to describe a new specimen of gondwanatherian mammaliaforms from beds belonging to the Maastrichtian Chorrillo Formation, cropping out 30 km SW of El Calafate, Santa Cruz Province, Argentina. It is represented by a single molariform referable to the species Magallanodon baikashkenke with which it shares a unique combination of characters. Analysis of the unique combination of characters exhibited by Magallanodon shed doubts on the monophyly of Ferugliotheriidae and suggest that South American taxa may be closely related to each other. The wide geographical distribution and occurrence of gondwanatherians on geological units of diverse origins suggest that they were capable of facing disparate environmental conditions.