Mammalia - Panameriungulata - Notonychopidae
Full reference: M. F. Soria. 1989. Notopterna: un nuevo orden de mamíferos ungulados eógenos de América del Sur. II: Notonychops powelli gen. et sp. nov (Notonychopidae nov.) de la Formación Río Loro (Paleoceno medio), provincia de Tucumán, Argentina. Ameghiniana 25(3):259-272
Parent taxon: Litopterna according to J. F. Bonaparte and J. Morales 1997
See also Gelfo et al. 2007 and Soria 1989
Sister taxa: Adianthidae, Eolicaphrium, Eolitopterna, Lambdaconus elegans, Lopholipterna, Macraucheniidae, Mesorhinidae, Paulogervaisia celata, Proacrodon, Proacrodon transformatus, Proadiantus gibbus, Proterotheriidae, Protolipternidae, Sparnotheriodontidae, Thoatheriopsis
Subtaxa: Notonychops Requisia Wainka
Ecology: scansorial herbivore
Distribution:
• Paleocene of Argentina (3 collections)
Total: 3 collections including 4 occurrences