Early Oligocene caviomorph rodents from Shapaja, Peruvian Amazonia

IF 1.8 2区地球科学 Q2 PALEONTOLOGY

Palaeontographica Abteilung A-Palaozoologie-Stratigraphie Pub Date : 2018-08-02 DOI:10.1127/PALA/2018/0075

M. Boivin, Laurent Marivaux, F. Pujos, R. Salas-Gismondi, Julia V. Tejada-Lara, R. Varas-Malca, P. Antoine

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引用次数: 20

Abstract

The rodent record during the late Eocene-early Oligocene interval is poorly known in South America. Our team's recent fieldwork in Peruvian Amazonia allowed for the discovery of five new fossil-bearing localities in a single stratigraphic section at Shapaja (Tarapoto area, San Martin Department), considered as early Oligocene by mammalian biostratigraphy. Here, we describe the caviomorph material from Shapaja, which documents 17 distinct taxa (with the co-occurrence of four to seven caviomorph taxa in a single level) representing at least three of the four extant superfamilies. Eight taxa are new to science: Kichkasteiromys raimondii nov. gen. et sp. and Shapajamys labocensis nov. gen. et sp. (Erethizontoidea), Selvamys paulus nov. gen. et sp. and Mayomys confluens nov. gen. et sp. (Octodontoidea), Eoincamys valverdei nov. sp. and E. parvus nov. sp. (?Chin-chilloidea), and Tarapotomys subandinus nov. gen. et sp. and T. mayoensis nov. gen. et sp. (superfamily indet.). These diversified caviomorph faunas constitute the most equatorial Paleogene record of this group. The taxa from Shapaja are not documented in other low-, mid-and high-latitudes Paleogene localities, except for Eoincamys. This genus is otherwise only found at Santa Rosa (Peruvian Amazonia, ?late Eocene/early Oligocene), thereby indicating a close temporal window for the Shapaja localities.

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秘鲁亚马逊河流域沙帕加地区早渐新世穴居类啮齿动物

始新世晚期至渐新世早期的啮齿动物记录在南美洲鲜为人知。我们的团队最近在秘鲁亚马逊地区的野外工作允许在Shapaja(圣马丁省Tarapoto地区)的一个地层剖面中发现五个新的含化石地点，被哺乳动物生物地层学认为是早近新世。在这里，我们描述了来自Shapaja的洞穴形态材料，这些材料记录了17个不同的类群(在一个水平上共出现4到7个洞穴形态类群)，代表了现存的四个超科中的至少三个。8个科学上的新分类群:Kichkasteiromys raimondii 11 . gen. et sp.和Shapajamys labocensis 11 . gen. et sp.(大齿兽总科)，Selvamys paulus 11 . gen. et sp.和Mayomys confluens 11 . gen. et sp.(八齿兽总科)，Eoincamys valverdei 11 . sp.和e.parvus 11 . sp. (chin- chillo总科)，Tarapotomys subandinus 11 . gen. et sp.和t.m ayoensis 11 . gen. et sp.(超科)。这些多样化的洞穴形动物群构成了该群最接近赤道的古近纪记录。除Eoincamys外，在其他低、中、高纬度古近纪地区均未发现沙帕加的分类群。除此之外，该属仅在圣罗莎(始新世晚期/渐新世早期的秘鲁亚马逊地区)发现，从而表明了Shapaja地区的封闭时间窗口。

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来源期刊

Palaeontographica Abteilung A-Palaozoologie-Stratigraphie 地学-古生物学

CiteScore

3.80

自引率

3.70%

发文量

审稿时长

>12 weeks

期刊介绍： Palaeontographica Section A publishes peer reviewed results of studies on palaeozoology, paleoecology and biostratigraphy. Its large paper format provides sufficient space for large tables, illustrations, photographs and Palaeontographica’s renowned plates. Published contributions span all areas of palaeozoology, i.e., systematic, phylogenetic and ecological aspects. Careful peer review ensures the high quality of the papers, covering localities all over the world. Many landmark papers in palaeozoology and biostratigraphy were published in Section A of Palaeontographica. This includes numerous lavishly illustrated monographs of certain groups of fossils and stratigraphic ranges. These monographs, are typical for Paleontographica papers, characterised by numerous highest quality plates and are printed on special high quality paper for excellent reproduction of picture plates.