Systematics of Oligoryzomys: Protein-Electrophoretic Analyses

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Abstract
The oryzomyines are a speciose tribe of Neotropical muroid rodents within which morphological comparisons have so far failed to produce well-resolved phylogenies. We report allozymic variation that provides information on the phylogeny of the genus Oligoryzomys and some other oryzomyines. We examined five species of Oligoryzomys, five species of Oryzomys, and representatives of Microryzomys, Neacomys, Nectomys, and Holochilus. Distributions of alleles were analyzed using a variety of phylogenetic estimation methods, applying different resampling strategies to estimate robustness. Character randomization was used to test for overall structure, and the technique was extended to test for structure beyond a set of nonoverlapping groups. The five species of Oligoryzomys examined were found to form a monophyletic group, although hierarchical relationships among them were not evident. Oligoryzomys is cladistically related to the similarly small-bodied mice of the genera Microryzomys and Neacomys to the exclusion of five species of Oryzomys, Nectomys, and Holochilus.

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