Acnodon is a genus of freshwater ray-finned fish belonging to the family Serrasalmidae, which includes the pacus and piranhas. The fishes in this genus are found in South America
Species Acnodon contains the following valid species: Acnodon normani Gosline, 1951 Acnodon oligacanthus (J. P. Müller & Troschel, 1844) Acnodon senai Jégu & dos Santos, 1990
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