Temporal range: Late Miocene–Early Pliocene 
With a length of more than 2 metres (6 ft 7 in) 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 1.35 m (4 ft 5 in). The closest living relative to Telicomys is the pacarana. Its name derives from Greek τηλικος + μυς = "a mouse [= rodent] of such a size".
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