Megapiranha

Megapiranha is a serrasalmid characin fish from the Late Miocene (8–10 million years ago) Ituzaingó Formation of Argentina, described in 2009.[1] The type species is M. paranensis.[2] It is thought to have been about 71 centimetres (28 in) in length.[3] The holotype consists only of premaxillae and a zigzag tooth row; the rest of its body is unknown.[4] 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).[3]