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Lagostomus maximus - Parc National El Palmar en Argentine (Entre-Rios).jpg
Plains viscacha
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Rodentia
Family: Chinchillidae
Subfamily: Lagostominae
Genus: Lagostomus
Brookes, 1828

Lagostomus crassus
Lagostomus maximus

Lagostomus is a South American genus of rodents in the family Chinchillidae. It contains a single living species, the plains viscacha, and it is the only Holocene genus in the subfamily Lagostominae.