Sympatric species ofEuneomys(Rodentia, Cricetidae)

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Abstract
A recent review lists all forms of Euneomys as a single species. We show in this report that two species live sympatrically at two localities in Chile and two in Argentina. The grooves on the anterior surfaces of the upper incisors are centrally positioned in one of the species and laterally positioned in the other. The species with central grooves has a larger head and body, larger hind foot, wider interorbital constriction, wider rostrum, longer molar toothrow, larger claws on the front feet, and lives in deep soils. The smaller species lives in bare, rocky habitat. The genus Euneomys thus comprises at least two species. The names mordax and chinchilloides are appropriate for the large and the small species, respectively.