Lagostomus crassus

Lagostomus crassus is an extinct species of viscacha that was native to Peru. It is known from a single skull found in southern Peru.

Lagostomus crassus Temporal range: Late Holocene
Conservation status
Extinct  (IUCN 3.1)[1]
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Rodentia
Family:	Chinchillidae
Genus:	Lagostomus
Species:	†L. crassus
Binomial name
†Lagostomus crassus Thomas, 1910

The skull is not in any way fossilized, indicating that the animal it belonged to lived very recently. The skull is also identical to that of the extant plains viscacha, being comparable in size to that of a large individual. Based on the above factors, it is probable that Lagostomus crassus is not a valid taxon, and merely a plains viscacha that was transported to Peru in ancient times.^[2]