INSTITUTO ARGENTINO DE NIVOLOGIA, GLACIOLOGIA Y CIENCIAS AMBIENTALES
Unidad Ejecutora - UE
FIRST EXTRA-PATAGONIAN RECORD OF ASMODEUS (NOTOUNGULATA, HOMALODOTHERIIDAE) IN THE LATE OLIGOCENE OF MENDOZA PROVINCE, ARGENTINA
SEOANE, F.; CERDEÑO, E
ASOCIACION PALEONTOLOGICA ARGENTINA
Lugar: Buenos Aires; Año: 2014 vol. 51 p. 373 - 373
The order Notoungulata is a large group of endemic mammals widespread throughout the Cenozoic of South America. Among them, the Family Homalodotheriidae is one of the less abundant and diverse, and geographically more restricted. Its record ranges from Early Oligocene to Late Miocene, but only a few genera were described, mainly known from Patagonia. This paper deals with the first homalodotheriid remains recovered from Deseadan levels outside Patagonia. The material comes from Quebrada Fiera, a Late Oligocene locality in the south of Mendoza Province (Argentina), and mainly consists in postcranial elements. The comparative study allows its recognition as the Patagonian genus Asmodeus, but with some significant differences from A. osborni Ameghino, which lead to propose the taxon from Mendoza as Asmodeus petrasnerus sp. nov. It is characterized by: calcaneum with a subtriangular navicular facet, ectal facet with concave medial border, and not projected anterodistal end; astragalus with distal facet more medially placed than in A. osborni, without astragalar foramen, and with astragalar groove expanded; cuboid without contact with the astragalus; Mc III with posteriorly expanded proximal facet; and Mc IV with medial facets separated to the proximal edge. The material from Mendoza provides new data on the postcranial anatomy of Asmodeus, and allows completing the diagnosis of this genus. The record of A. petrasnerus sp. nov. in Quebrada Fiera increases the diversity and the geographical distribution of the genus and the family during the Late Oligocene.