Astrapotherium guillei MAPBAR

MacPhee, R. D. E., Del Pino, Santiago Hernández, Kramarz, Alejandro, Forasiepi, Analía M., Bond, Mariano & Sulser, R. Benjamin, 2021, Cranial Morphology And Phylogenetic Relationships Of Trigonostylops Wortmani, An Eocene South American Native Ungulate, Bulletin of the American Museum of Natural History 2021 (449), pp. 1-185 : 15

Astrapotherium guillei MAPBAR 5322, recently described by Kramarz et al. (2019a), is an almost complete but laterally compressed skull preserving most of the bones and delicate structures of the basicranium, including the cranial portion of the hyoid apparatus and paracondylar processes. Unlike other Astrapotherium specimens used for comparisons, which derive from Early Miocene (Santacrucian) beds of southern Patagonia, A. guillei is Middle Miocene (Colloncuran) in age and the youngest representative of the genus known to date.