The name "characins" is a historical one,[3] but scientists today tend to prefer "characids" to reflect their status as a, by and large, monophyletic group (at family rank). This family includes some of the first characiforms to be described to science, such as Charax and Tetragonopterus, and thus lend their name to the order, as well as to common names such as "characin" and "tetra".[4]
Past taxonomic treatments had a much more expansive definition of the family, including numerous South American fish families such as the piranhas and dorados, as well as the African alestids. Following multiple taxonomic revisions, this was eventually restricted to just the American "tetra" type characins by the 2010s. However, even this definition of Characidae was found to obscure much of the evolutionary diversity within the group, and in 2024 the "tetra" families Acestrorhamphidae and Stevardiidae were split out of the Characidae, leaving it with just five subfamilies.[5][6]
This family has undergone a large amount of systematic and taxonomic change. More recent revision has moved many former members of the family into their own related but distinct families – the pencilfishes of the genus Nannostomus are a typical example, having now been moved into the Lebiasinidae, the assorted predatory species belonging to Hoplias and Hoplerythrinus have now been moved into the Erythrinidae, and the sabre-toothed fishes of the genus Hydrolycus have been moved into the Cynodontidae. The former subfamily Alestiinae was promoted to family level (Alestiidae) and the subfamilies Crenuchinae and Characidiinae were moved to the family Crenuchidae.[1]
^Characinae, recently narrowly defined, covers only twelve genera and 79 species closely related to Charax (George M.T. Mattox, Monica Toledo-Piza, "Phylogenetic study of the Characinae (Teleostei: Characiformes: Characidae)" Zoological Journal of the Linnean Society, 165.4:809–915, August 2012).
^Malabarba, L.R. & Jerep, F.C. (2012): A New Genus and Species of Cheirodontine Fish from South America (Teleostei: Characidae). Copeia, 2012 (2): 243–250.
^Vari, R.P., Melo, B.F. & Oliveira, C. (2016): Protocheirodon, a new genus of Characidae (Teleostei: Characiformes) with the redescription of the poorly known Protocheirodon pi. Neotropical Ichthyology, 14 (2): e150154.
^Bruno F. Melo, Ricardo C. Benine, Gabriel S.C. Silva, Gleisy S. Avelino, Claudio Oliveira: Molecular phylogeny of the Neotropical fish genus Tetragonopterus (Teleostei: Characiformes: Characidae). Molecular Phylogenetics and Evolution, November 2015, doi:10.1016/j.ympev.2015.10.022
de Lucena, Carlos Alberto Santos (2003): New characid fish, Hyphessobrycon scutulatus, from the rio Teles Pires drainage, upper rio Tapajós system (Ostariophysi: Characiformes: Characidae). Neotropical Ichthyology1(2): 93–96. PDF fulltext