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A new species of the gopher Gregorymys (Rodentia, Geomyidae) from the early Oligocene (Arikareean 1) of southern Mexico

Published online by Cambridge University Press:  20 August 2020

Elizabeth Ortiz-Caballero Open the ORCID record for Elizabeth Ortiz-Caballero [Opens in a new window] ,
Eduardo Jiménez-Hidalgo Open the ORCID record for Eduardo Jiménez-Hidalgo [Opens in a new window]  and
Victor M. Bravo-Cuevas Open the ORCID record for Victor M. Bravo-Cuevas [Opens in a new window]
Elizabeth Ortiz-Caballero
Affiliation:
Doctorado en Ciencias en Biodiversidad y Conservación, Área Académica de Biología. Universidad Autónoma del Estado de Hidalgo, Ciudad del Conocimiento, Carretera Pachuca-Tulancingo km 4.5, CP 42184, Pachuca, Hidalgo, México
Eduardo Jiménez-Hidalgo*
Affiliation:
Laboratorio de Paleobiología, Instituto de Recursos, Campus Puerto Escondido, Universidad del Mar, Carretera Puerto Escondido-Oaxaca km 2.5, CP 71985, Oaxaca, México
Victor M. Bravo-Cuevas
Affiliation:
Museo de Paleontología, Área Académica de Biología. Universidad Autónoma del Estado de Hidalgo, Ciudad del Conocimiento, Carretera Pachuca-Tulancingo km 4.5, CP 42184, Pachuca, Hidalgo, México
*
*Corresponding author
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Abstract

A new species of gopher, Gregorymys mixtecorum n. sp., is described from the Arikareean 1 (early Oligocene) of Oaxaca, southern Mexico. Phylogenetic analysis indicates that it is the sister species of G. veloxikua, which was also recently described from southern Mexico. Both species were collected from sediments of the Chilapa Formation that crop out in northwestern Oaxaca. Gregorymys mixtecorum n. sp. and G. veloxikua show differences in size and proportions that possibly reduced competition for resources, exploiting different microhabitats. Both Mexican species represent the oldest and the most southern records of Gregorymys in North America. The Mexican record of Gregorymys suggests that at least some entoptychine rodents diversified in southern Mexico or Central America, and that Geomyidae has had a wide geographic distribution in North America since the early Oligocene.

UUID: http://zoobank.org/0f4ad549-2f59-442b-87fa-5c9be0573ea4

Type
Articles
Information
Journal of Paleontology , Volume 94 , Issue 6 , November 2020 , pp. 1191 - 1201
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Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press on behalf of The Paleontological Society.

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