首页> 外文期刊>Journal of South American earth sciences >First record of Procyon cancrivorus (G. Cuvier, 1798) (Carnivora, Procyonidae) in stratigraphic context in the Late Pleistocene of Brazil
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First record of Procyon cancrivorus (G. Cuvier, 1798) (Carnivora, Procyonidae) in stratigraphic context in the Late Pleistocene of Brazil

机译:巴西晚更新世地层背景下的加拿大白屈菜(Procyon cancrivorus)(G。Cuvier,1798年)(食肉目,Procyonidae)的首次记录

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摘要

Although five genera of procyonids are currently present in South America, only two of the extant genera, Procyon and Nasua are represented in the South American fossil record. A recent discovery of a procyonid lower second molar in Late Pleistocene deposits of Aurora do Tocantins, northern Brazil, offers potential to further our understanding of the stratigraphic and temporal range of South American fossil procyonids. We use geometric morphometric analysis of two-dimensional landmarks and semiland-marks to explore morphological variation in the lower second molars of extant Procyon lotor and Procyon cancrivorus and multivariate methods to support the identification of the Pleistocene specimen as P. cancrivorus. This material represents the second fossil record of P. cancrivorus in South America Pro-cyonids entered South America in two phases: the first comprising by Cyonasua and Chapadmalania during the Late Miocene, and the other recent genera, beginning in the Late Pleistocene. These Late Miocene procyonids were more carnivorous than Late Pleistocene-Recent omnivorous taxa and possible went extinct due to competition with other placental carnivorans that entered South America and diversified during the latest Pliocene-Early Pleistocene.
机译:尽管南美目前存在5个类固醇类,但在南美化石记录中仅现存两个属Procyon和Nasua。最近在巴西北部奥罗拉杜托坎汀斯的晚更新世沉积中发现了procyonid较低的第二磨牙,为进一步了解南美化石procprocids的地层和时间范围提供了潜力。我们使用二维地标和半地标的几何形态计量学分析来探索现存的Procyon lotor和Procyon cancrivorus的下第二磨牙的形态变化,并采用多变量方法来支持将更新世标本鉴定为P. cancrivorus。该物质代表南美南美白对虾的第二个化石记录。始新世以两个阶段进入南美:第一个阶段由中新世晚期的Cyonasua和Chapadmalania组成,另一个近世始于更新世。这些晚中新世肉食动物比晚更新世近杂食动物更食肉,并可能由于与进入南美并在最近的上新世早期更新世期间多样化的其他胎盘食肉动物的竞争而灭绝。

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    Facultad de Ciencias Naturales y Museo, Universidad National de La Plata, 122 y 60, 1900 La Plata, Buenos Aires, Argentina;

    Division Paleontologia Vertebrados, Museo de La Plata, Consejo National de Investigaciones Cientfficas y Tecnicas, Paseo del Bosque sro, 1900 La Plata, Argentina;

    Laboratdrio de Mastozoologia, Departamento de Zoologia, Universidade Federal do Estado do Rio de Janeiro (UNIRIO), Avenida Pasteur 458, IBIO, sala 501, Urea 22240290, Rio de Janeiro, Brazil;

    Sectidn Mastozoologia, Museo de La Plata, Consejo National de Investigationes Cientijicas y Tecnicas, Paseo del Bosque s°, 1900 La Plata, Argentina;

    Laboratdrio de Mastozoologia, Departamento de Zoologia, Universidade Federal do Estado do Rio de Janeiro (UNIRIO), Avenida Pasteur 458, IBIO, sala 501, Urea 22240290, Rio de Janeiro, Brazil;

    Laboratdrio de Mastozoologia, Departamento de Zoologia, Universidade Federal do Estado do Rio de Janeiro (UNIRIO), Avenida Pasteur 458, IBIO, sala 501, Urea 22240290, Rio de Janeiro, Brazil;

    Department of Ceosciences and Don Sundquist Center of Excellence in Paleontology, Box 70357, East Tennessee State University, Johnson City, TN 37614, USA;

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  • 正文语种 eng
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  • 关键词

    Late Pleistocene; South America; Procyonidae; Procyon cancrivorus; Brazil; Tocantins;

    机译:晚更新世;南美洲;cy科棘形藻巴西;托康汀;

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