CONICET | Buscador de Institutos y Recursos Humanos

The first record of aChilean gastropod of the Late Oligocene of Argentina is described. Thespecimens show a typical general morphology and a characteristic nepionicsculpture of Chiliborus (Mollusca: Gastropoda), being the first fossilof this genus of Strophocheilidae. The locality of Quebrada Fiera (Malargüe,Mendoza Province) had provided vertebrates (a small lizard, birds and manymammals, such as notoungulates, litopterns, carnivorous marsupials), but thisis the first record of an invertebrate. The mammal assemblage has been assigned to the Deseadan Mammal Age andcorresponds to an open woodland environment that developed in semiaridconditions during a period of volcanic activity. The extant species of Chiliboruslive in a warm oceanic climate on the westcoast of Chile, in areas with vegetation that varies from sclerophyllous shrublands,small forests to transitional and mixed forests.