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Volume 82, Issue 1


Taxonomic status of Wiedomys marplatensis, an enigmatic fossil cricetid (Rodentia, Sigmodontinae): neither Wiedomys nor Wiedomyini

Ulyses F.J. Pardiñas
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  • Instituto de Diversidad y Evolución Austral (IDEAus-CONICET), CC 128, 9120 Puerto Madryn, Argentina
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  • Instituto Superior de Correlación Geológica (INSUGEO), Av. Presidente Perón s/n, 4107 Yerba Buena, Tucumán, Argentina
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Published Online: 2017-02-11 | DOI: https://doi.org/10.1515/mammalia-2016-0105


The generic placement and tribal affiliation of Wiedomys marplatensis Quintana, 2002 are revised based on the study of its holotype and a single known remains from San Andrés Formation (Early Pleistocene; Buenos Aires Province, Argentina). The anatomical traits selected as indicators belonging to Wiedomys Hershkovitz, 1959 are interpreted here as general similarities. Wiedomys marplatensis is removed from Wiedomys and is considered as a junior synonym of Cholomys pearsoni Reig, 1980. The affiliation of the latter to Wiedomyini is discussed and the alternative hypothesis to allocate Cholomys Reig, 1980 in Oryzomyini is advanced. Although further research and more fossils are necessary to solve this issue, the placement of Cholomys as Sigmodontinae incertae sedis and the avoidance of using it as a point of calibration in molecular phylogenies are suggested.

This article offers supplementary material which is provided at the end of the article.

Keywords: Argentina; Cholomys; Cricetidae; retromolar fossa; Wiedomyini


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About the article

Received: 2016-07-22

Accepted: 2016-11-29

Published Online: 2017-02-11

Published in Print: 2017-12-20

Citation Information: Mammalia, Volume 82, Issue 1, Pages 99–105, ISSN (Online) 1864-1547, ISSN (Print) 0025-1461, DOI: https://doi.org/10.1515/mammalia-2016-0105.

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