The genus Oryzomys currently includes about eight species distributed from the eastern United States (O. palustris) into northwestern South America (O. gorgasi).[9] O. peninsulae is part of the O. couesi section, which is centered around the widespread Central American O. couesi and also includes various other species with more limited and peripheral distributions.[10] Many aspects of the systematics of this section remain unclear and it is likely that the current classification underestimates the group's true diversity.[11] Oryzomys was previously a much larger genus, but most species were progressively removed in various studies, culminating in contributions by Marcelo Weksler and coworkers in 2006 that excluded more than forty species from the genus.[12] Oryzomys and many of the species removed from it are classified in the tribe Oryzomyini ("rice rats"), a diverse assemblage of American rodents of over a hundred species,[13] and on higher taxonomic levels in the subfamily Sigmodontinae of family Cricetidae, along with hundreds of other species of mainly small rodents
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