Megapiranha is an extinct genus of serrasalmid characin fish that lived 8 to 10 million years ago, in the Late Miocene. It’s estimated to have reached lengths of up to 1.3 meters, which is about four times the size of piranha alive today. These estimates are based upon fossil specimens that have been discovered.
Read more @ SciTechDaily
I used to have a pet Red Piranha, and would have to use a metal food colander to catch it! It would chew up thick plastic plants like they were paper! 🙂