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''Pristobrycon'' is a genus of piranhas from the Orinoco and Amazon Basins, as well as rivers in the Guianas. ''Pristobrycon'' is not monophyletic. No single morphological feature has been found that completely diagnoses this genus. ''P. striolatus'' is very different from other species of this genus. The genus ''Pristobrycon'' was created by Eigenmann to include species which have intermediate characters between "the fierce ''Rooseveltiella'' (HREF="http://www.kotoba.ne.jp/word/11/Pygocentrus nattereri" TITLE="Pygocentrus nattereri">Pygocentrus nattereri'' ) without palatine teeth, and the less blood-thirsty ''Serrasalmus'' with a series of permanent teeth along the palatine". The author designed ''P. calmoni'' as the type species of the genus. Two groups are included in this genus. One group is characterized by presence of the preanal spine (only ''P. calmoni'') and the other group including the rest of the species assigned (''P. careospinus'', ''P. maculipinnis'' and ''P. striolatus'') (Fink & Machado-Allison, 1992; Machado-Allison et al., 1989; Machado-Allison & Fink, 1996). The validity ''P. aureus'' is questionable. ==Species== There are currently five recognized species in this genus: * ''Pristobrycon aureus'' (Spix & Agassiz, 1829) * ''Pristobrycon calmoni'' (Steindachner, 1908) * ''Pristobrycon careospinus'' W. L. Fink & Machado-Allison, 1992 * ''Pristobrycon maculipinnis'' W. L. Fink & Machado-Allison, 1992 * ''Pristobrycon striolatus'' (Steindachner, 1908) 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「Pristobrycon」の詳細全文を読む スポンサード リンク
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