Hello,
.
There are total of 60 different kinds of piranhas exist on the planet. Not all the piranhas can be mentioned but here are some of the most dangerous fishes,

• Catoprion
• Pristobrycon
• Serrasalmus
• Pygopristis

.
They are a family of Serrasalmidae. These all piranhas comes under the Serrasalmidae family. These pirahnas can eat a human and pirahnas like red piranhas, black piranhas are dangers kind of piranhas