Oldfieldthomasiidae is an extinct family of notoungulate mammals known from the Late Paleocene to Late Eocene of South America.^[1] The family was classified by George Gaylord Simpson in 1945 and a synonym is Acoelodidae, defined by Florentino Ameghino in 1901.^[2]

Quick Facts Scientific classification, Genera ...

Oldfieldthomasiidae Temporal range: Late Paleocene-Late Eocene ~58.7–33.9 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	†Notoungulata
Suborder:	†Typotheria
Family:	†Oldfieldthomasiidae Simpson, 1945
Genera
†Allalmeia †Brachystephanus †Camargomendesia †Colbertia †Dolichostylodon †Itaboraitherium †Kibenikhoria †Maxschlosseria †Oldfieldthomasia †Paginula †Suniodon †Tsamnichoria †Ultrapithecus †Xenostephanus
Synonyms
Acoelodidae Ameghino 1901

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The family is named after British zoologist Oldfield Thomas.

Fossils of the family Oldfieldthomasiidae have been found in southern South America, in Argentina, Bolivia, Brazil and Chile.^[2]