Notostylopidae Temporal range: Late Paleocene-Early Oligocene (Riochican-Tinguirirican) ~58.7–28.4 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Skull of Notostylops
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	†Notoungulata
Suborder:	†Notioprogonia
Family:	†Notostylopidae Ameghino 1897
Genera
†Boreastylops †Chilestylops †Edvardotrouessartia †Homalostylops †Notostylops †Otrhonia

Notostylopidae is an extinct family comprising five genera of notoungulate mammals known from the Late Paleocene (Riochican) to Early Oligocene (Tinguirirican) of Argentina, Brazil and Chile in South America^[1]