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The oldest sigmodontine rodent revisited and the age of the first South American cricetids

Published online by Cambridge University Press:  17 December 2018

Franck Barbière Open the ORCID record for Franck Barbière [Opens in a new window] ,
Pablo E. Ortiz  and
Ulyses F.J. Pardiñas
Franck Barbière
Affiliation:
Instituto Superior de Correlación Geológica (INSUGEO), Av. Presidente Perón s/n, 4107 Yerba Buena, Tucumán, Argentina
Pablo E. Ortiz
Affiliation:
Instituto Superior de Correlación Geológica (INSUGEO), Av. Presidente Perón s/n, 4107 Yerba Buena, Tucumán, Argentina Cátedra de Paleontología, Facultad de Ciencias Naturales e Instituto Miguel Lillo, Miguel Lillo 205, 4000 San Miguel de Tucumán, Argentina
Ulyses F.J. Pardiñas
Affiliation:
Instituto de Diversidad y Evolución Austral (IDEAus-CONICET), Boulevard Brown 2915, 9120 Puerto Madryn, Chubut, Argentina and Instituto Nacional de Biodiversidad (INABIO), Ecuador
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Abstract

New fossil material of Auliscomys formosus Reig 1978 allows restudy of the oldest known South American representative of the subfamily Sigmodontinae. Description of Auliscomys formosus was based on a fragmentary dentary exhumed from the Monte Hermoso Formation of central Argentina. Previous studies allocated A. formosus to the early Pliocene. A reevaluation of dental and cranial morphology, including for the first time the upper dentition, and the inclusion of A. formosus in a phylogenetic analysis of the tribe Phyllotini indicate that A. formosus represents a new genus, Kraglievichimys. Kraglievichimys shares a mosaic of characters with the living Auliscomys Osgood, 1915 and Loxodontomys Osgood, 1947. The taxonomic reassignment of A. formosus and the possibility that the Monte Hermoso Formation may be younger than early Pliocene in age provide a new understanding of cricetid diversification in South America. Estimates of sigmodontine ancestry by molecular approaches are biased toward older ages, whereas this new interpretation of the history of K. formosus suggests that the South American history of sigmodontines spans less than 4 million years.

UUID: http://zoobank.org/49dd8f60-56b1-4e8a-a044-6cea3a1bd52b

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Articles
Information
Journal of Paleontology , Volume 93 , Issue 2 , March 2019 , pp. 368 - 384
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Copyright © 2018, The Paleontological Society 

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