Journal of Mammalian Evolution

, Volume 25, Issue 3, pp 427–439 | Cite as

Gregorymys veloxikua, The Oldest Pocket Gopher (Rodentia: Geomyidae), and The Early Diversification of Geomyoidea

  • Eduardo Jiménez-HidalgoEmail author
  • Rosalía Guerrero-Arenas
  • Krister T. Smith
Original Paper


The rodent family Geomyidae is native to America. It comprises six extant genera with 40 species distributed from Saskatchewan, Canada to northern Colombia. Two subfamilies are included in the family, the extinct Entoptychinae, with a fossil record ranging from the late Oligocene (Arikareean) to the middle Miocene (Barstovian) and the Geomyinae, with a chronological range from middle Miocene (Barstovian) to Recent. Here, we describe a new species of Gregorymys, G. veloxikua, the oldest known entoptychinae, from the late Eocene fluviolacustrine sediments of Santiago Yolomécatl, Oaxaca, Mexico. The record of this geomyid in southern Mexico suggests that the early diversification of superfamily Geomyoidea began earlier than the late Eocene in southern Mexico/Central America. The direct association of several studied specimens with burrows indicates that fossoriality was acquired early in the evolution of the family.


Oaxaca Yolomécatl Late Eocene Chadronian Mixteca Evolution 



We thank the municipal authorities and landowners of Santiago Yolomécatl for the opportunity to prospect their lands. Several students and colleagues helped in the field collecting; thanks to all of you. EJH thanks Jin Meng for approving a visit to the Fossil Mammal Collection of the American Museum of Natural History and Judy Galkin for her kind help during that visit. We appreciate the comments and suggestions of the anonymous reviewers, which contributed to improve this study. This research was funded by Universidad del Mar project 2IR1606, Consejo Nacional de Ciencia y Tecnología, Ciencia Básica 2015-01 project No. 255883, and National Geographic Society/Waitt Grant Program 09-77.

Supplementary material

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Copyright information

© Springer Science+Business Media New York 2017

Authors and Affiliations

  • Eduardo Jiménez-Hidalgo
    • 1
    Email author
  • Rosalía Guerrero-Arenas
    • 1
  • Krister T. Smith
    • 2
  1. 1.Laboratorio de Paleobiología, Instituto de Recursos, campus Puerto EscondidoUniversidad del MarOaxacaMexico
  2. 2.Department of Palaeoanthropology and Messel ResearchSenckenberg Research InstituteFrankfurt am MainGermany

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