what up NINJA
hmmm thankshastatus said:Bare in mind that the concave profile above the eyes is found primarily in juveniles and young adults of all species. With very old piranas (such as S. rhombeus) they are very convex profile to the point of looking like a Pygocentrus. Only in home aquarios do tank raised piranas tend not to have a massive dorsum because of diet and lack of certain vitamins found only in nature. That is why you see many of the wild caught appear different when compared to same species raised in aquarios.
Actually you are quite mistaken on several of your points above. P. nattereri was ranked as a subgenus Taddyella nattereri (Gery, 1972, 1977). Antonio Machado-Allison (1985) revised the group in its original Eigenmann (1915) placement of 4 genera. Fink had little to do with the placement as you describe. He revised the genus Pygocentrus only by naming 3 species and providing a key. Prior to this several other authors also broke the group up, some reestablishing the original placement, others using the Norman 1929 lumping.It should also be noted that it really wasnt misinformation, it was a matter of being out dated information. Nattereri used to be classified as Serrasalmus before Dr. Fink revised the twp genus several years back