relax, Trig. There is very little black and white here, and let's not start name calling because of a little confusion. I believe everyone should be entitled to their opinion, whether right or wrong (without out being attacked or insulted).
I would agree with you that piranha crosses, to my knowledge, have not been documented; BUT I would not agree with you that 'rhombeus' is found 'in every country piranha are found'. It is generally agreed that 'rhombeus', as used on these species location lists, are NOT one species; rather a complex of species yet to be split out, and identified.