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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.

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