New Middle Miocene Caviomorph Rodents from Quebrada Honda, Bolivia

  • Darin A. Croft
  • Jennifer M. H. Chick
  • Federico Anaya
Original Paper


The rodents of the middle Miocene fauna of Quebrada Honda Bolivia are described. The most abundant rodent is the chinchillid Prolagostomus sp. More precise identification of this species will require revision of early to middle Miocene lagostomines, taking into account variation in modern populations. The next most common rodents are the tiny octodontoid Acarechimys, sp. nov.?, and the caviid Guiomys unica. The Acarechimys species may be unique to Quebrada Honda, but verification awaits revision of this geographically and temporally widespread genus. Guiomys unica is a recently described species otherwise known only from two Patagonian localities, El Petiso and Río Chico. Two rodents are unique to Quebrada Honda. Mesoprocta hypsodus, gen. et sp. nov., is a dasyproctid distinguished by its very hypsodont, cement-covered cheek teeth. Quebradahondomys potosiensis, gen. et sp. nov., is an adelphomyine echimyid distinguished by the less oblique lophids of its trilophodont cheek teeth, among other features. The rodents of Quebrada Honda are more similar to those of Patagonia than those of northern South America, paralleling patterns seen in other mammal groups from this fauna.


Endemism Laventan Neogene Neotropics Provinciality Rodentia South America 



We thank N. Czaplewski, A. Kramarz, M. Pérez, S. Simpson, and J. Wertheim for very helpful discussions; M. Jin (AMHN), A. Kramarz (MACN), S. McLaren and J.R. Wible (Carnegie Museum), and D. Rubliar (Museo Nacional de Historia Natural, Santiago, Chile) for access to specimens in their care; D. Brinkman (YPM-PU), and R. Hulbert and B. MacFadden (UF), and M. Jin (AMNH) for loans of specimens; D. Auerbach, R. Chavez, J. Conrad, P. Higgins, C. Garzione, and J. Smith for assistance in the field; J.R. Wible and anonymous reviewers for critical reviews of the content of this paper; and D. Chapman, M. Ryan, A. Shinya, and L. Yerian for assistance with fossil preparation and specimen curation. A preliminary version of this research was submitted for J. Chick’s M.S. thesis. Funding for this research was provided by the National Geographic Society Committee for Research and Exploration (NGS 8115–06 to D. Croft) and the National Science Foundation (EAR 0958733 to D. Croft, EAR 0635678 to C. Garzione and T. Jordan).


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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • Darin A. Croft
    • 1
  • Jennifer M. H. Chick
    • 2
  • Federico Anaya
    • 3
  1. 1.Department of AnatomyCase Western Reserve University School of MedicineClevelandUSA
  2. 2.Department of BiologyCase Western Reserve UniversityClevelandUSA
  3. 3.Facultad de Ingeniería GeológicaUniversidad Autónoma Tomás FríasPotosíBolivia

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