''Coniopternium'' is an extinct genus of macraucheniids from the Late Oligocene of

South America South America is a continent entirely in the Western Hemisphere and mostly in the Southern Hemisphere, with a considerably smaller portion in the Northern Hemisphere. It can also be described as the southern Subregion#Americas, subregion o ...

. Fossils of ''Coniopternium'' have been found in the Agua de la Piedra, Deseado, and

Sarmiento Formation The Sarmiento Formation (Spanish language, Spanish: ''Formación Sarmiento''), in older literature described as the Casamayor Formation, is a geological formation in Chubut Province, Argentina, in central Patagonia, which spans around 30 million y ...

s of

Argentina Argentina, officially the Argentine Republic, is a country in the southern half of South America. It covers an area of , making it the List of South American countries by area, second-largest country in South America after Brazil, the fourt ...

, the Salla Formation of

Bolivia Bolivia, officially the Plurinational State of Bolivia, is a landlocked country located in central South America. The country features diverse geography, including vast Amazonian plains, tropical lowlands, mountains, the Gran Chaco Province, w ...

, and the Moquegua Formation of

Peru Peru, officially the Republic of Peru, is a country in western South America. It is bordered in the north by Ecuador and Colombia, in the east by Brazil, in the southeast by Bolivia, in the south by Chile, and in the south and west by the Pac ...

Taxonomy

''Coniopternium'' was first described by Ameghino in 1895 based on fossils found in the

Chubut Province Chubut ( from Tehuelche language, Tehuelche 'transparent'; ) is a provinces of Argentina, province in southern Argentina, situated between the 42nd parallel south (the border with Río Negro Province), the 46th parallel south (bordering Santa ...

. 19 years later, in 1914, the species ''Notodiaphorus crassus'' had been described, whose fossils were discovered in the La Flecha locality of the Deseado Formation in Santa Cruz Province. However, later authorities have since synonymized ''Notodiaphorus'' with ''Coniopternium andinum''.

References

{{Taxonbar, from=Q112167753 Macraucheniids Oligocene mammals of South America Deseadan Paleogene Argentina Paleogene Bolivia Paleogene Peru Fossils of Argentina Fossils of Bolivia Fossils of Peru Fossil taxa described in 1894 Taxa named by Florentino Ameghino Prehistoric placental genera Golfo San Jorge Basin Sarmiento Formation