Promegatherium ("before Megatherium") is a genus of prehistoric xenarthrans that lived in Argentina, during the Late Miocene. This genus is regarded as closely related to the later, and more famous genus, Megatherium, hence the reference in the name. The first specimens of Promegatherium were originally described by the biologist Florentino Ameghino in 1887. Fossils of Promegatherium have been found in the Ituzaingó Formation in Argentina. References Further reading Family tree of Megatheriidae M. C. McKenna & S. K. Bell (eds.) (1997): Classification of mammals, above the species level. New York: Columbia University Press. Prehistoric placental genera Prehistoric sloths Miocene xenarthrans Miocene genus extinctions Miocene mammals of South America Huayquerian Neogene Argentina Fossils of Argentina Ituzaingó Formation Fossil taxa described in 1887 Taxa named by Florentino Ameghino