REVISION SISTEMATICA y RECONOCIMIENTO DE UNA NUEVA ESPECIE DEL GENERO THYLATHERIDIUM REIG (MARSUPIALIA, DIDELPHIDAE)

Francisco J. Going, Claudia Montalvo

Abstract


New remains assignable to species of Thylatheridiurn Reig, 1952, from Huayquerian (late Miocene) sediments of La Pampa Province (Argentina) are described. Specimen MLP 86-Vll-I0-l, referred to T. dolgopolae, shows several unique features among members of this genus: p3 obliquely oriented in the dental row, talonid of m4 extremely narrow. Specimen PVM 1001 is assigned to a new species: T. hudsoni, characterized by its rather slender mandibular ramus, lacking a developed labial convexity, and intermediate in size from those of. T. pascuali and T. dolgopolae; ml-4 with poorly developed anterior cingula, and talonid of m4 comparatively very broad. The dental specializations found in all species of Thylatheridium suggest an adaptive tendence over small vertebrate predation, although it can 't be discarded partially insectivorous habits, at least at some stages of their ontogenetic development.

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