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Temporal range: Late Miocene
|An artist's illustration of Megapiranha paranensis|
| †Megapiranha paranensis|
Cione et al. 2009
Megapiranha paranensis 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 up to a meter 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.