Redescription of a small Caviidae (Rodentia: Hystricognathi) from the Neogene of northwestern Argentina and its systematic implications

IF 1.2 4区 地球科学 Q3 PALEONTOLOGY
María Carolina MADOZZO JAÉN, M. E. Pérez
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Abstract

The understanding of the taxonomy, diversity, and evolutionary patterns of caviids in northwestern Argentina is still in the process of development. This paper presents new insights into the systematic and evolution of Orthomyctera andina (Rovereto, 1914), one of the most abundant species within Caviidae Fischer de Waldheim, 1817, in the fossil record of this region. A comprehensive anatomical description and taxonomic review of Orthomyctera andina in a phylogenetic context is provided. Moreover, it includes a redescription of the type specimen of Orthomyctera rigens (Ameghino, 1888). The taxonomical results confirm that O. andina belongs to a different genus: Orocavia (Kraglievich, 1932). The phylogenetic analysis further confirms the placement of both species within Caviinae Fischer de Waldheim, 1817. Orthomyctera andina is the sister taxon of the clade that includes ­Microcavia Gervais & Ameghino, 1880, Dolicavia Ameghino, 1916, Neocavia Kraglievich, 1932, and Orthomyctera Ameghino, 1889. It is supported by a combination of plesiomorphic characters (e.g.  furrow opposite to hypoflexus/id in molariforms) shared with basal taxa and Dolichotinae Pocock, 1922 and derived characters (such as a terreced palate, external auditory meatus below the occlusal surface , length of p4-m1 shorter than length of m2-m3) shared with Caviinae. This study aims to elucidate the taxonomic status of these poorly known rodents and their relationships within Caviidae. Additionally, it incorporates a biogeographic analysis of caviomorph communities from the late Neogene in Argentina.
阿根廷西北部新近纪一种小型腔肠动物(啮齿目:Hystricognathi)的重新描述及其系统影响
对阿根廷西北部腔肠动物的分类、多样性和进化模式的了解仍处于发展过程中。本文对 Orthomyctera andina(Rovereto,1914 年)的系统和进化提出了新的见解,Othomyctera andina 是该地区化石记录中腔肠动物科 Fischer de Waldheim, 1817 最丰富的物种之一。本报告从系统发育的角度对 Orthomyctera andina 进行了全面的解剖学描述和分类学综述。此外,该研究还包括对 Orthomyctera rigens(Ameghino,1888 年)模式标本的重新描述。分类结果证实 O. andina 属于不同的属:Orocavia (Kraglievich, 1932)。系统发生分析进一步证实了这两个物种都属于 Caviinae Fischer de Waldheim, 1817。Orthomyctera andina 是包括 Microcavia Gervais & Ameghino, 1880、Dolicavia Ameghino, 1916、Neocavia Kraglievich, 1932 和 Orthomyctera Ameghino, 1889 的支系的姊妹类群。它得到了与基干类群和 Dolichotinae Pocock, 1922 共享的等位形态特征(如臼齿犁沟与下犁沟/id 相对)和与 Caviinae 共享的派生特征(如上颚有地形、外耳道位于咬合面之下、p4-m1 的长度短于 m2-m3 的长度)的结合的支持。本研究旨在阐明这些鲜为人知的啮齿类动物的分类学地位及其与豚鼠科的关系。此外,该研究还对阿根廷新近纪晚期的啮齿动物群落进行了生物地理学分析。
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来源期刊
Comptes Rendus Palevol
Comptes Rendus Palevol 地学-古生物学
CiteScore
2.10
自引率
0.00%
发文量
39
审稿时长
17.6 weeks
期刊介绍: Comptes Rendus Palevol is a fully electronic and peer-reviewed journal, with a continuous publication stream, devoted to palaeontology, prehistory and evolutionary sciences. It publishes original research results, in French or English, in the following domains: systematic and human palaeontology, prehistory, evolutionary biology and macroevolution, and history of sciences. Thematic issues may also be published under the responsibility of a guest editor. All articles published in Comptes Rendus Palevol are compliant with the different nomenclatural codes. A copyright assignment will be signed by the authors before publication.
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