HomeFish encyclopediaRay-finned fishesPerch-like fishJawfishesSwordtail jawfish Swordtail jawfish (Lonchopisthus micrognathus) Scientific name: Lonchopisthus micrognathus Poey, 1860 The Swordtail jawfish (Lonchopisthus micrognathus) is a marine fish of the family Opistognathidae. Native range: Western Central Atlantic, southern Florida, USA and Gulf of Mexico to the northern coast of South America. BiologyDorsal spines (total): 11; Dorsal soft rays (total): 17-18; Anal spines: 3; Anal soft rays: 16 - 17Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameLonchopisthus micrognathusFamilyOpistognathidae (Jawfishes)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length17.8EnvironmentMarine; reef-associatedClimateSubtropicalDistributionWestern Central Atlantic: southern Florida, USA and Gulf of Mexico to the northern coast of South America.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