Notostylopidae

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

References 

Category:Notoungulates
Category:Prehistoric mammal families
Category:Paleogene mammals of South America
Category:Eocene first appearances
Category:Rupelian extinctions
Category:Taxa named by Florentino Ameghino