First record of Posnanskytherium (Notoungulata, Toxodontidae) in the late Neogene of eastern Puna, Argentina

IF 1.6 3区生物学 Q2 ZOOLOGY

Journal of Mammalian Evolution Pub Date : 2024-01-27 DOI:10.1007/s10914-023-09700-5

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引用次数: 0

Abstract

Records of the toxodontid Posnanskytherium were only known from the Pliocene levels of the Bolivian Altiplano and southern Peru. Posnanskytherium desaguaderoi (type species), P. inchasense, P. viscachanense, and P. pacis are the four species recognized so far. In this contribution, we present the first remains of Posnanskytherium desaguaderoi (incomplete skull and fragmentary mandibles) from the Casira locality (Upper Member of the Tafna Formation, Pliocene), eastern Puna, Jujuy Province, Argentina, and provide an extended diagnosis of the genus and the type species. A new phylogenetic analysis recovers Posnanskytherium as a monophyletic clade, with P. desaguaderoi as the sister taxon of P. inchasense and P. viscachanense. The body mass calculated for all Posnanskytherium species indicates that P. desaguaderoi has an intermediate body mass between the higher values corresponding to P. viscachanense and P. inchasense and the lower value of P. pacis. This finding from the eastern Argentinean Puna constitutes the northernmost record of a toxodontid in Argentina, the first appearance of Posnanskytherium in the country, the southernmost record of the genus, and it reinforces the paleofaunistic similarity with the Bolivian Altiplano. Evidence shows that the genus Posnanskytherium had a wide distribution during the late Neogene, ranging from southern Peru to northern Argentina, reaching a greater diversification in the Bolivian Altiplano during the Pliocene.

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阿根廷普纳东部新近纪晚期首次记录到 Posnanskytherium（Notoungulata, Toxodontidae）的踪迹

摘要毒蜥Posnanskytherium的记录仅见于玻利维亚阿尔蒂普拉诺和秘鲁南部的上新世。Posnanskytherium desaguaderoi（模式种）、P. inchasense、P. viscachanense 和 P. pacis 是迄今为止已知的四个物种。在这篇论文中，我们首次展示了来自阿根廷胡胡伊省东部普纳的卡西拉地点（上新世塔夫纳地层上统）的 Posnanskytherium desaguaderoi（不完整的头骨和残缺的下颌骨），并对该属和模式种进行了扩展诊断。新的系统发育分析将 Posnanskytherium 恢复为一个单系支系，P. desaguaderoi 是 P. inchasense 和 P. viscachanense 的姊妹类群。根据对所有 Posnanskytherium 种类的体重计算，desaguaderoi Posnanskytherium 的体重介于 viscachanense Posnanskytherium 和 inchasense Posnanskytherium 的较高值与 pacis Posnanskytherium 的较低值之间。阿根廷东部普纳地区的这一发现是阿根廷最北的毒齿兽记录，也是 Posnanskytherium 在阿根廷的首次出现，是该属最南端的记录，它加强了与玻利维亚阿尔蒂普拉诺古生态的相似性。证据显示，Posnanskytherium属在新近纪晚期分布广泛，从秘鲁南部到阿根廷北部，在玻利维亚阿尔蒂普拉诺的上新世达到了更大的多样化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Mammalian Evolution ZOOLOGY-

CiteScore

4.30

自引率

10.50%

发文量

审稿时长

>12 weeks

期刊介绍： Journal of Mammalian Evolution is a multidisciplinary forum devoted to studies on the comparative morphology, molecular biology, paleobiology, genetics, developmental and reproductive biology, biogeography, systematics, ethology and ecology, and population dynamics of mammals and the ways that these diverse data can be analyzed for the reconstruction of mammalian evolution. The journal publishes high-quality peer-reviewed original articles and reviews derived from both laboratory and field studies. The journal serves as an international forum to facilitate communication among researchers in the multiple fields that contribute to our understanding of mammalian evolutionary biology.