Proplatyarthrus Temporal range: Early Oligocene (Tinguirirican-Deseadan) ~33.9–28.4 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Talus bone of Proplatyarthrus
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Superorder:	Xenarthra
Order:	Pilosa
Family:	Megalonychidae
Genus:	†Proplatyarthrus Ameghino 1905
Species
P. longipes

Proplatyarthrus is an extinct genus of ground sloths of the family Megalonychidae, endemic to Chubut Province, Argentina in South America.^[1]

Taxonomy

Proplatyarthrus was named and a talus bone described by Florentino Ameghino in 1905.^[2] It was assigned to Megalonychidae by Carroll in 1988.^[3]