A New Species of Cardiomyinae (Rodentia, Hydrochoeridae) From Western Argentina: Its Age and Considerations on Ontogeny and Diversity of the Subfamily
- Vucetich, María Guiomar
- Deschamps, Cecilia Marcela
- Morgan, Cecilia Clara
- Forasiepi, Analia Marta
DOIAbstract
A new Cardiomyinae rodent (Hydrochoeridae) from Arroyo Seco de la Frazada, Mendoza Province, Argentina, is described. The new species, Caviodon cuyano sp. nov., is distinguished by its greater robustness, deeper fissures, and greater number of prisms in M3, which are derived characters within the context of Hydrochoeridae evolution. An assessment of the species of Caviodon Ameghino showed that tooth growth is allometric and occlusal morphology becomes more complex during ontogeny, as in hydrochoerines. The true diversity of this genus, when tooth postnatal ontogeny is considered, may be less than heretofore estimated. The fossil-bearing levels, the middle section of the Aisol Formation, have been considered no older than Huayquerian in age ...
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