|Named By:||Alberto Luis Cione, Wasila M, Dahdul, John G. Lundberg & Antonio MachadoinAllison in 2009|
|Time Period:||Late Miocene|
|Size:||Estimated up to 1 meter long|
|Diet:||Uncertain, probably carnivorous, but teeth could have been used for a herbivorous diet|
|Classification:||| Chordata | Actinopterygii | Characiformes | Characidae | Serrasalminae ||
Megapiranha paranensis or megapiranha is an extinct serrasalmid characin fish from the Late Miocene (8-10 million years ago) of Argentina, described in 2009. It is thought to have been about 71-128 centimetres (2.33-4.20 ft) in length. The holotype consists only of premaxillae and a zigzag tooth row; the rest of its body is unknown. This dentition is reminiscent of both the double-row seen in pacus, and the single row seen in the teeth of modern piranhas, suggesting that M. paranensis is a transitional form. Its bite force is estimated between 1,240-4,749 N (279-1,068 lbf).