Mammalia - Xenarthra - Megalonychidae
Full reference: F. Ameghino. 1894. Enumeration Synoptique des especes de mammiferes fossiles des formations Eocenes de Patagonie. Boletin de la Academia Nacional de Ciencias en Cordoba (Republica Argentina) 13:259-452
Parent taxon: Megalonychidae according to F. Ameghino 1894
Sister taxa: Acratocnus, Ahytherium, Amphihapalops, Amphiocnus, Australonyx, Choloepus, Diabolotherium, Diheterocnus, Eugeronops, Hyperleptus, Megalocninae, Megalocnus, Megalonychinae, Megalonychops, Megalonychotherium, Megalonyx, Meizonyx, Mesocnus, Metopotherini, Microcnus, Miocnus, Nothropus, Ocnopodinae, Ortotheriinae, Ortotherium, Paranabradys, Pliometanastes, Pliomorphus, Proplatyarthrus, Protomegalonyx, Torcellia, Bradypodina
Subtaxa: Mecorhinus primus
Ecology: ground dwelling herbivore