Mammalia - Megatherioidea - Megalonychidae
Full reference: F. Ameghino. 1902. Première contribution à la connaissance de la fauna mammalogique des couches à Colpodon [First contribution to the knowledge of the mammalian fauna of the Colopdon Beds]. Boletin de la Academia Nacional de Ciencias de Córdoba 17:71-141
Parent taxon: Megalonychidae according to F. Ameghino 1902
Sister taxa: Amphihapalops, Amphiocnus, Analcimorphus, Choloepodinae, Deseadognathus, Diheterocnus, Eleutherodon, Eucholoeops, Eugeronops, Geronops, Hapalops, Holomegalonyx, Hyperleptus, Mecorhinus, Megalocninae, Megalonychinae, Megalonychops, Megalonychotherium, Meizonyx, Mesocnus, Mesopotamocnus, Metopotherini, Microcnus, Miocnus, Nohochichak, Nothropus, Ocnopodinae, Ortotheriinae, Ortotherium, Paranabradys, Paraplanops, Pattersonocnus, Pliomorphus, Protomegalonyx, Pseudhapalops, Pseudortotherium, Torcellia, Trematherium, Urumacocnus, Xibalbaonyx, Zacatzontli
Subtaxa: Hapaloides Proschismotherium
Ecology: ground dwelling herbivore
Distribution: found only at Gran Barranca - southern cliff of lake Colhué Huapí (Miocene of Argentina)