oldfieldthomasiidae

{{short description|Extinct family of mammals}}

{{Automatic taxobox

| fossil_range = Late Paleocene-Late Eocene
~{{Fossil range|58.7|33.9}}

| image =

| image_caption =

| taxon = Oldfieldthomasiidae

| authority = Simpson, 1945

| subdivision_ranks = Genera

| subdivision =

†Allalmeia

†Brachystephanus

†Camargomendesia

†Colbertia

†Dolichostylodon

†Itaboraitherium

†Kibenikhoria

†Maxschlosseria

†Oldfieldthomasia

†Paginula

†Suniodon

†Tsamnichoria

†Ultrapithecus

†Xenostephanus

| synonyms =

• Acoelodidae {{small|Ameghino 1901}}

}}

Oldfieldthomasiidae is an extinct family of notoungulate mammals known from the Late Paleocene to Late Eocene of South America.{{cite book |last=McKenna |first=Malcolm C. |last2=Bell |first2=Susan K. |year=1997 |title=Classification of Mammals Above the Species Level |publisher=Columbia University Press, New York |pages=1–631 |isbn=0-231-11013-8}} The family was classified by George Gaylord Simpson in 1945 and a synonym is Acoelodidae, defined by Florentino Ameghino in 1901.[https://paleobiodb.org/classic/checkTaxonInfo?taxon_no=43341 Oldfieldthomasiidae] at Fossilworks.org