HomeFish encyclopediaRay-finned fishesLive bearers, Killifishes and RivulinesSplitfinsBlack splitfin Black splitfin (Xenotoca melanosoma) Scientific name: Xenotoca melanosoma Fitzsimons, 1972 The Black splitfin (Xenotoca melanosoma) is a freshwater fish of the family Goodeidae. Native range: North America, Mexico. Species factsScientific nameXenotoca melanosomaFamilyGoodeidae (Splitfins)OrderCyprinodontiformes (Live bearers, Killifishes and Rivulines)ClassActinopterygii (Ray-finned fishes)Maximum length8.0EnvironmentFreshwater; demersalClimateTropicalDistributionNorth America: Mexico.Conservation status (IUCN)Not EvaluatedThreat to humansHarmless SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026