Aphyocharacinae Aphyoditeinae Bryconinae Characinae Cheirodontinae Gymnocharacinae Heterocharacinae Iguanodectinae Pristellinae Rhoadsiinae Salmininae Stethaprioninae Stevardiinae Tetragonopterinae and see text Characidae, the characids or characins, is a family of freshwater subtropical and tropical fish belonging to the order Characiformes.The name "characins" is a historical one,[2] but scientists today tend to prefer "characids" to reflect their status as a, by and large, monophyletic group (at family rank).Spintherobolus clade Stethaprioninae Stevardiinae Aphyocharacini Cheirodontini Compsurini Exodontini Tetragonopterini Characini This family has undergone a large amount of systematic and taxonomic change.[8] The larger piranhas were originally classified as belonging to the Characidae, but various revisions place them in their own related family, the Serrasalmidae.Given the current state of flux of the Characidae, a number of other changes will doubtless take place, reassigning once-familiar species to other families.