HomeFish encyclopediaRay-finned fishesCharacinsPencilfishesBlackmouth pyrrhulina Blackmouth pyrrhulina (Pyrrhulina melanostoma) Scientific name: Pyrrhulina melanostoma Cope, 1870 The Blackmouth pyrrhulina (Pyrrhulina melanostoma) is a freshwater fish of the family Lebiasinidae. Native range: South America, Argentina. Species factsScientific namePyrrhulina melanostomaFamilyLebiasinidae (Pencilfishes)OrderCharaciformes (Characins)ClassActinopterygii (Ray-finned fishes)EnvironmentFreshwater; benthopelagicClimateTropicalDistributionSouth America: Argentina.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