Second specimen of Corriebaatar marywaltersae from the Lower Cretaceous of Australia confirms its multituberculate affinities

IF 1.8 3区地球科学 Q2 PALEONTOLOGY

Acta Palaeontologica Polonica Pub Date : 2022-01-01 DOI:10.4202/app.00924.2021

T. Rich, P. Trusler, L. Kool, Matt A. White, J. Bevitt, S. Morton, Patricia Vickers−Rich

引用次数: 0

Abstract

A second specimen of the Australian cimolodontan multituberculate Corriebaatar marywaltersae from the same locality (Flat Rocks) as the holotype and previously only known specimen, reveals far more anatomical information about the species. The new specimen, composed of most of a dentary containing a complete p4 and alveoli for the lower incisor and the lower first and second molars, exhibits a suite of features consistent with allocation of Corriebaatar to Cimolodonta and further confirms the presence of multituberculates on Gondwana during the Mesozoic. The revised (older) age of the Flat Rocks locality to latest Barremian (mid-Early Cretaceous) establishes C. marywaltersae as the oldest currently known cimolodontan. This has profound biogeographic implications for the distribution of multituberculates on Gondwana as well as globally, particularly in light of the fact that Corriebaatar appears to be a relatively derived member of Cimolodonta.

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来自澳大利亚下白垩纪的第二个Corriebaatar marywaltersae标本证实了它的多结核亲缘关系

来自同一地区(Flat Rocks)的第二个澳大利亚多瘤Corriebaatar marywaltersae标本，与以前唯一已知的标本一样，揭示了更多关于该物种的解剖学信息。新发现的标本包含一个完整的牙槽和下门牙以及下第一和第二磨牙的牙槽，显示出一系列与Corriebaatar划分到Cimolodonta相一致的特征，并进一步证实了冈瓦纳在中生代时期存在多结核。平岩地区到巴雷米晚期(早白垩世中期)的修订(更老)年龄确定了C. marywaltersae是目前已知的最古老的cimolodontan。这对冈瓦纳和全球多瘤动物的分布具有深远的生物地理意义，特别是考虑到Corriebaatar似乎是Cimolodonta的一个相对衍生的成员。

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

Acta Palaeontologica Polonica 地学-古生物学

CiteScore

2.80

自引率

5.60%

发文量

审稿时长

12.5 months

期刊介绍： Acta Palaeontologica Polonica is an international quarterly journal publishing papers of general interest from all areas of paleontology. Since its founding by Roman Kozłowski in 1956, various currents of modern paleontology have been represented in the contents of the journal, especially those rooted in biologically oriented paleontology, an area he helped establish. In-depth studies of all kinds of fossils, of the mode of life of ancient organisms and structure of their skeletons are welcome, as those offering stratigraphically ordered evidence of evolution. Work on vertebrates and applications of fossil evidence to developmental studies, both ontogeny and astogeny of clonal organisms, have a long tradition in our journal. Evolution of the biosphere and its ecosystems, as inferred from geochemical evidence, has also been the focus of studies published in the journal.