Title
Early Oligocene caviomorph rodents from Shapaja, Peruvian Amazonia
Date Issued
01 July 2018
Access level
metadata only access
Resource Type
journal article
Author(s)
Boivin M.
Marivaux L.
Pujos F.
Antoine P.O.
Publisher(s)
Gebruder Borntraeger Verlagsbuchhandlung
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 Martín 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. (?Chinchilloidea), 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.
Start page
87
End page
156
Volume
311
Issue
June 1
Language
English
OCDE Knowledge area
Paleontología
Subjects
Scopus EID
2-s2.0-85051556563
Source
Palaeontographica, Abteilung A: Palaozoologie - Stratigraphie
ISSN of the container
03750442
Sponsor(s)
We especially thank the IRD-PeruPetro Convention Programme for logistic support. Many thanks to S. Adnet (ISEM, Montpellier, France), M. Roddaz and P. Baby (IRD-PeruPetro, Lima, Peru and GET, Toulouse, France), E. Diaz Ramos and A. Benites Palomino (MUSM, Lima, Peru), G. Billet (MNHN, Paris, France), C. Martinez (Cornell University, USA), F. Moreno (University of Rochester, New York, USA), F. Parra (Paleosedes, Bogotá, Colombia and GET, France) and whoever helped us in the field and in the lab. We are particularly grateful to our drivers Giancarlo and Manuel, for their long standing help during the yearly field seasons. We are much indebted to M. Arnal, A. M. Candela and M. G. Vucetich (MLP, La Plata, Argentina), to M. E. Pérez (MEF, Trelew, Argentina), and to A. G. Kramarz (MACN, Buenos Aires, Argentina) for discussing on rodent affinities, and providing us crucial references. C. Argot (MNHN, Paris, France), M. Reguero (MLP, La Plata, Argentina), and A. G. Kramarz kindly granted access to the collections under their care. We gratefully thank M. G. Vucetich, who kindly provided casts of fossil rodents from Argentinean Patagonia. We warmly thank C. Cazevieille (Montpellier RIO Imaging, Institut des Neurosciences de Montpellier, France) and D. Cot (Institut Européen des Membranes, Montpellier, France) for access to a scanning electron microscope facility. We also thank the Editorial Board of the Palaeontographica Abteilung A journal as well as C. Vieytes (MLP, La Plata, Argentina) and A. Kramarz, who provided formal reviews of this manuscript that enhanced the final version. This work was supported by the Leakey Foundation, the National Geographic Society, an "Investissements d'Avenir" grant managed by the "Agence Nationale de la Recherche" (CEBA, ANR-10-LABX-0025-01), and by the COOPINTEER CNRS/CONICET and the ECOSSUD/ FONCyT international collaboration programs. This work was carried out in the frame of the ongoing cooperation agreement between the Museo de Historia Natural de la Universidad Nacional Mayor San Marcos (Lima, Peru) and the Institut des Sciences de l'Evolution de Montpellier-Université de Montpellier, France. This is ISEM publication 2017-207-Sud.
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