''Eoviscaccia'' is an extinct

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

of chinchillid

rodent Rodents (from Latin , 'to gnaw') are mammals of the Order (biology), order Rodentia ( ), which are characterized by a single pair of continuously growing incisors in each of the upper and Mandible, lower jaws. About 40% of all mammal specie ...

that lived during the

Early Oligocene The Rupelian is, in the geologic timescale, the older of two age (geology), ages or the lower of two stage (stratigraphy), stages of the Oligocene epoch (geology), Epoch/series (stratigraphy), Series. It spans the time between . It is preceded b ...

(

Tinguirirican The Tinguirirican () age is a period of geologic time (36.0–29.0 Mya (unit), Ma) within the Eocene, Late Eocene and Oligocene, Early Oligocene epochs of the Paleogene, used more specifically within the South American land mammal age, SALMA classi ...

) to the Early Miocene ( Colhuehuapian) in what is now

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 this genus have been found in the

Cerro Bandera The Cerro Bandera is a hill located on Navarino Island, is visible from Puerto Williams and its top is a flag of Chile, takes about 3 hours to travel back and forth. It is also the first stop to continue the circuit ''Dientes de Navarino''. Se ...

, Chichinales, Fray Bentos, 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 Abanico Formation of

Chile Chile, officially the Republic of Chile, is a country in western South America. It is the southernmost country in the world and the closest to Antarctica, stretching along a narrow strip of land between the Andes, Andes Mountains and the Paci ...

Taxonomy

''Eoviscaccia'' was first described by María Guiomar Vucetich in 1989 based on remains found in the Salla Formation of Bolivia and the Sarmiento Formation of

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 ...

, Argentina, with the proposed type species being ''Eoviscaccia boliviana''. Two other species, ''E. australis'' and ''E. frassinettii'', were both named in 1989 and 2012 respectively, with ''E. australis'' being found in Chubut, Entre Ríos,

Neuquén Neuquén (; ) is the capital city of the Argentine province of Neuquén and of the Confluencia Department, located in the east of the province. It occupies a strip of land west of the confluence of the Limay and Neuquén rivers which form t ...

, and

Río Negro Province Río Negro (, ''Black River'') is a province of Argentina, located in northern Patagonia. Neighboring provinces are from the south clockwise Chubut, Neuquén, Mendoza, La Pampa and Buenos Aires. To the east lies the Atlantic Ocean. Its cap ...

s of Argentina, while ''E. frassinettii'' was found in the Abanico Formation of Chile. The following cladogram of the

Caviomorpha Caviomorpha is the rodent parvorder that unites all New World hystricognaths. It is supported by both fossil and molecular evidence. The Caviomorpha was for a time considered to be a separate order outside the Rodentia, but is now accepted as ...

is based on Busker ''et al.'' 2020, showing the position of ''Eoviscaccia''.

References

{{Taxonbar, from=Q21224147 Chinchillidae Miocene mammals of South America Oligocene mammals of South America Miocene rodents Oligocene rodents Colhuehuapian Deseadan Tinguirirican Neogene Argentina Paleogene Argentina Fossils of Argentina Paleogene Bolivia Fossils of Bolivia Paleogene Chile Fossils of Chile Fossil taxa described in 1989 Prehistoric rodent genera Paraná Basin Neuquén Basin Golfo San Jorge Basin Cerro Bandera Formation Chichinales Formation Sarmiento Formation Fray Bentos Formation