Octomys mimax (Rodentia: Octodontidae)

Raúl Sobrero; Valeria E. Campos; Stella M. Giannoni; Luis A. Ebensperger

doi:10.1644/853.1

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Raúl Sobrero,¹ Valeria E. Campos,² Stella M. Giannoni,² Luis A. Ebensperger^1,3

¹Departamento de Ecología, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Casilla 114-D, Santiago 651377, Chile (RS); (LAE) rsobrero@bio.puc.cl lebensperger@bio.puc.cl
²Instituto y Museo de Ciencias Naturales, Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de San Juan, Avenida España 400 (Norte) 5400 Capital San Juan, Argentina and Consejo Nacional de Investigaciones Científicas y Técnicas (
³Centro de Estudios Avanzados en Ecología y Biodiversidad (CASEB), Pontificia Universidad Católica de Chile, Casilla 114-D, Santiago 651377, Chile (LAE) lebensperger@bio.puc.cl

Abstract

Octomys mimax O. Thomas, 1920, the viscacha rat, is a surface-dwelling rodent, endemic to the Monte biome of western Argentina. The genus Octomys is monotypic and represents a basal clade within the family Octodontidae. O. mimax is strictly herbivorous and is found in low-elevation arid environments characterized by galleries or rock formations. In these environments, O. mimax nests within rock crevices located inside ravines with relatively low vegetation cover. O. mimax is solitary and mostly nocturnal. Nocturnal activity coupled with a basal metabolic rate and thermal conductance lower than expected for body mass of O. mimax probably represent strategies for water conservation in this species.

Citation Download Citation

Raúl Sobrero, Valeria E. Campos, Stella M. Giannoni, and Luis A. Ebensperger "Octomys mimax (Rodentia: Octodontidae)," Mammalian Species 42(1), 49-57, (25 March 2010). https://doi.org/10.1644/853.1

Published: 25 March 2010

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