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''Pygocentrus'' is a genus of the piranha family Serrasalmidae. All species are native to tropical and subtropical South America. All the species are predatory, scavengers and form huge schools. The famous red-bellied piranha, ''Pygocentrus nattereri'', is one of four species in the genus. The Chi-Cohala tribe uses the teeth to make tools and weapons. ==Species== There are currently four recognized species in this genus: * ''Pygocentrus cariba'' (Humboldt, 1821) (black spot piranha) – Orinoco river basin. * ''Pygocentrus nattereri'' Kner, 1858 (red piranha, red-bellied piranha) – Amazon, Paraguay-Paraná-Uruguay, and Essequibo river basins, as well as various river in northeastern Brazil. * ''Pygocentrus palometa'' Valenciennes, 1850 – Orinoco river basin, validity questionable. * ''Pygocentrus piraya'' (G. Cuvier, 1819) (San Francisco piranha) – São Francisco River 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Pygocentrus」の詳細全文を読む スポンサード リンク
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