Coniopternium

{{Short description|Extinct genus of litopterns}}

{{Automatic taxobox

| fossil_range = Late Oligocene (Deseadan)
~{{fossil range|29.0|23.0}}

| image = Coniopternium andinum fossils - Agua de la Piedra Formation.jpg

| image_upright = 1.1

| image_caption = Astragali of Coniopternium andinum

| taxon = Coniopternium

| authority = Ameghino, 1894

| type_species = †Coniopternium andinum

| type_species_authority = Ameghino, 1894

| subdivision_ranks = Species

| subdivision = *†C. andinum {{small|Ameghino, 1894}}

• †C. primitivum {{small|Cifelli and Soria, 1983}}

| synonyms = †Notodiaphorus crassus {{small|Loomis, 1914}}

}}

Coniopternium is an extinct genus of macraucheniids from the Late Oligocene of South America. Fossils of Coniopternium have been found in the Agua de la Piedra, Deseado, and Sarmiento Formations of Argentina,{{Cite journal |last1=Schmidt |first1=Gabriela Ines |last2=Cerdeño |first2=Esperanza |last3=Pino |first3=Santiago Hernández Del |date=2019-05-31 |title=Macraucheniidae and Proterotheriidae (Mammalia, Litopterna) from Quebrada Fiera (Late Oligocene), Mendoza Province, Argentina |url=http://www.andeangeology.cl/index.php/revista1/article/view/V46n2-3109 |journal=Andean Geology |language=en |volume=46 |issue=2 |pages=368–382 |doi=10.5027/andgeoV46n2-3109 |issn=0718-7106|doi-access=free|bibcode=2019AndGe..46..368S |hdl=11336/80129 |hdl-access=free }}{{Cite journal |last=Cerdeño |first=E. |date=2011-12-30 |title=Quebrada Fiera (Mendoza), un importante centro paleobiogeográfico en el Oligoceno tardío de América del Sur |url=https://estudiosgeol.revistas.csic.es/index.php/estudiosgeol/article/view/849 |journal=Estudios Geológicos |language=es |volume=67 |issue=2 |pages=375–384 |doi=10.3989/egeol.40519.194 |issn=1988-3250|doi-access=free}}

the Salla Formation

of Bolivia,{{cite book |last1=Shockey|first1=B.|last2=Anaya|first2=F.|title=Mammalian Evolutionary Morphology: A Tribute to Frederick S. Szalay |chapter= Postcranial Osteology of Mammals from Salla, Bolivia (Late Oligocene): Form, Function, and Phylogenetic Implications|series=Vertebrate Paleobiology and Paleoanthropology Series|publisher=Springer|pages=135–157|editor-last1=Sargis |editor-first1=E. J.|editor-last2=Dagosto|editor-first2=M.|doi=10.1007/978-1-4020-6997-0_7| year = 2008|isbn=978-1-4020-6996-3}}

and the Moquegua Formation of Peru.{{Cite journal |last1=Shockey |first1=Bruce J. |last2=Gismondi |first2=Rodolfo Salas |last3=Gans |first3=Phillip |last4=Jeong |first4=Annie |last5=Flynn |first5=John J. |date=2009 |title=Paleontology and Geochronology of the Deseadan (late Oligocene) of Moquegua, Perú |journal=American Museum Novitates |issue=3668 |pages=1–24 |doi=10.1206/662.1 |issn=0003-0082|doi-access=free}}