Telicomys
Telicomys is an extinct genus of rodent from the Solimões Formation, Brazil, South America. Description 
This rodent weighed approximately . With a length of more than  in T. gigantissimus, it contains two or three of the largest rodents that ever lived, along with Phoberomys, Josephoartigasia, and the giant beaver. It is part of the same South American radiation of rodents as both Phoberomys and the modern capybara, which is the largest living rodent, reaching lengths of up to . The closest living relative to Telicomys is the pacarana. Its name derives from Greek τηλικος + μυς = "a mouse [= rodent] of such a size". References 

Prehistoric pacaranas
Miocene rodents
Prehistoric rodent genera
Miocene genera
Miocene mammals of South America
Huayquerian
Chasicoan
Mayoan
Miocene Brazil
Fossils of Brazil
Fossil taxa described in 1926