A new montane species of spiny pocket mouse (Rodentia, Heteromyidae, Heteromys) from northwestern Costa Rica

Title Variants

Alternative: Costa Rican spiny pocket mouse

Related Titles

Series: American Museum novitates, no. 3509

By

Anderson, Robert P.

Timm, Robert M.

Type

Book

Material

Published material

Publication info

New York, NY American Museum of Natural History c2006

Notes

Title from caption.

"March 16, 2006."

Abstract also in Spanish.

[English abstract]. Recent taxonomic works have recognized only two species of spiny pocket mice of the genus Heteromys (Rodentia: Heteromyidae) from Costa Rica. Within Costa Rica, the widespread H. desmarestianus is considered to occur throughout the wet Caribbean lowlands, as well as at middle and high elevations on the Caribbean and Pacific slopes of the country's main montane systems. In contrast, H. oresterus is known from only a few localities at high elevations in the western portion of the Cordillera de Talamanca in central Costa Rica. Our morphological and morphometric analyses of specimens from northwestern Costa Rica reveal the presence of an undescribed species of the genus, which we describe as Heteromys nubicolens. This new species ranges from 750 to 1840 m in elevation in the Cordillera de Tilarán and Cordillera de Guanacaste. Heteromys desmarestianus is found in the surrounding mesic lowlands and foothills. Externally, both species possess dark brown dorsal pelage, but H. nubicolens differs by overall larger size and by distinctive cranial proportions. In most cranial measurements, H. nubicolens is larger than H. desmarestianus; however, H. desmarestianus has a wider interorbital region and a wider braincase. Known populations of H. nubicolens occur in three highland areas (Monteverde, Volcán Rincón de la Vieja-Volcán Santa María, and Cerro Cacao), but populations in these areas are probably disjunct, being separated by intervening lowlands. Heteromys nubicolens is likely widespread throughout the Cordillera de Tilarán and Cordillera de Guanacaste, but its presence in other areas of the country is unlikely. Even after recognizing H. nubicolens as distinct from H. desmarestianus, morphological, karyological, and genetic data indicate that H. desmarestianus represents a species complex. Further research is therefore necessary to evaluate the taxonomic status of this species complex in other regions of the country and other parts of its widespread geographic distribution.

Subjects

Classification , Costa Rica , Forest spiny pocket mice , Heteromyidae , Mammals , Rodents

Call Number

QL1 .A436 no.3509 2006

Language

English

Identifiers

DOI: https://doi.org/10.1206/0003-0082(2006)3509[1:ANMSOS]2.0.CO;2
OCLC: 65181921