Monotypic Characins

While this article is titled "Monotypic", it is actually about any characin that does not fit neatly into other categories

Other Characins
While the smaller species of the characin group (see tetra) are more commonly kept in the aquarium, the species listed in this article section, belonging to related family groups, have equally strong claims for aquarium consideration. Hatchetfishes (Gasteropelecidae), pencilfishes (Anostomidae), and piranhas (Serrasalmidae) are all equally interesting to keep.