Phoberomys burmeisteri is an extinct rodent that lived in the late Miocene of southern South America.

[1] Phoberomys burmeisteri was one of the largest rodents that ever existed, with an estimated weight of up to 1,543 pounds (700 kg) and a length of over 10 feet (3.0 m).

This massive size allowed it to feed on tough plant material and avoid predation by most carnivores.

Many species of Phoberomys (P. praecursor, P. insolita, P. lozanoi and P. minima) were described for the Ituzaingó Formation, but were recently synonymized with P.

[1] The exact cause of Phoberomys burmeisteri's extinction is unknown, but it is thought to have occurred during the Pliocene epoch, around 2.5 million years ago.