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Serrasalmidae
Serrasalmidae is a family of characiform fishes, recently elevated to family status. It includes about 94 species. The name means "serrated salmon family", which refers to the serrated keel running along the belly of these fish. Fish classified as Serrasalmidae are also known by these common names: pacu, piranha, and silver dollar. These common names generally designate differing dental characteristics and feeding habits.〔
==Description==
Serrasalmids are medium- to large-sized characiform fishes that reach about long, generally characterized by a deep, laterally compressed body with a series of midventral abdominal spines or scutes, and a long dorsal fin (over 16 rays). Most species also possess an anteriorly directed spine just before the dorsal fin extending from a supraneural bone; exceptions include members of the genera ''Colossoma'', ''Piaractus'', and ''Mylossoma''.〔
Most serrasalmids have about 60 chromosomes, ranging from 54 to 62.''Metynnis'' has 62 chromosomes, as does ''Catoprion'', ''Pristobrycon striolatus'', and ''Pygopristis''.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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