Oligoryzomys

Rocha, Rita G., Ferreira, Eduardo, Costa, Barbara M. A., Martins, Iracy C. M., Leite, Yuri L. R., Costa, Leonora P. & Fonseca, Carlos, 2011, Small mammals of the mid-Araguaia River in central Brazil, with the description of a new species of climbing rat, Zootaxa 2789, pp. 1-34 : 21-22

Oligoryzomys sp.

Identification. Only one specimen from a second Oligoryzomys species was captured in this ecotonal area. This taxon is very distinct from sympatric O. fornesi in mtDNA sequences (11.5%) and is also slightly distinct in external morphology. The specimen of Oligoryzomys sp. has lighter dorsal pelage, its body sides are strongly demarcated by yellowish fur, and hind feet are completely white, when compared to O. fornesi .

The skull of Oligoryzomys sp. is slightly larger than that of O. fornesi and it shares most of craniodental characters with it, but we were unable to do a thorough comparison between them because the skull of our specimen was slightly damaged.

Measurements (n = 1): HB = 82, T = 102, HF = 23, E = 18, W = 16.

Distribution. This species was collected on the left bank of the Javaés River, at the southern edge of Parque Estadual do Cantão.

Natural history. Only one adult male with scrotal testes was captured in a Sherman trap at PEC in a flooded forest area in October 2007. It is syntopic with O. fornesi and they were captured along the same trap line.

Vouchers (n = 1: ɗ): UFES 1442.