This small animal was vaguely similar to a marmot or a nutria. It was characterized by its low-crowned (brachydont) premolars and molars, with a narrow lingual groove and small pits in the upper molars. The cheekbone, as in typical interatheriids, was characterized by the exclusion of the jugal bone from the orbit, due to the zygomatic process of the maxilla and the presence of a small descending process.[1]
Antofagastia was first described in 2014, based on fossil remains found in the Geste Formation, from the Late Eocene of Northwestern Argentina. It was related to Punapithecus.[1]
References
^ abcde*D. A. García-López & M. J. Babot (2014): Notoungulate faunas of north-western Argentina: new findings of early-diverging forms from the Eocene Geste Formation, Journal of Systematic Palaeontology, DOI: 10.1080/14772019.2014.930527