Deuterodon

Deuterodon is a genus of characins from river basins in southern and southeastern Brazil (Rio Grande do Sul to Espírito Santo), with a single species of uncertain taxonomic status, D. potaroensis, from Guyana. These are small fish that reach up to 12.6 cm in total length. They are omnivores with a specialized mouth structure that allows them to scrape algae and debris off bedrock.

Species formerly considered members of the genera Probolodus and Myxiops are considered to be members of Deuterodon by modern researchers, following a thorough phyletic review of several characid genera in 2020.

Species
The following 24 species are recognized in the genus Deuterodon:


 * Deuterodon aphos (Zanata & Akama, 2004)
 * Deuterodon burgerai (Zanata & Camelier, 2009)
 * Deuterodon giton (Eigenmann, 1908)
 * Deuterodon hamatilis (Camelier & Zanata, 2014)
 * Deuterodon hastatus (Myers, 1928)
 * Deuterodon heterostomus (Eigenmann, 1911)
 * Deuterodon iguape C. H. Eigenmann, 1907
 * Deuterodon intermedius (Eigenmann, 1908)
 * Deuterodon janeiroensis (Eigenmann, 1908)
 * Deuterodon langei Travassos, 1957
 * Deuterodon longirostris (Steindachner, 1907)
 * Deuterodon luetkenii (Boulenger, 1887)
 * Deuterodon mutator (Eigenmann, 1909)
 * Deuterodon oyakawai (Santos & Castro, 2014)
 * Deuterodon parahybae C. H. Eigenmann, 1908
 * Deuterodon pelecus (Bertaco & Lucena, 2006)
 * Deuterodon potaroensis C. H. Eigenmann, 1909
 * Deuterodon ribeirae (Eigenmann, 1911)
 * Deuterodon rosae (Steindachner, 1908)
 * Deuterodon sazimai (Santos & Castro, 2014)
 * Deuterodon singularis Z. M. S. de Lucena & C. A. S. de Lucena, 1992
 * Deuterodon stigmaturus (A. L. Gomes, 1947)
 * Deuterodon supparis Z. M. S. de Lucena & C. A. S. de Lucena, 1992
 * Deuterodon taeniatus (Jenyns, 1842)