HomeFish encyclopediaRay-finned fishesFlatfishesLefteye floundersSmallmouth moonflounder Smallmouth moonflounder (Monolene microstoma) Scientific name: Monolene microstoma Cadenat, 1937 The Smallmouth moonflounder (Monolene microstoma) is a marine fish of the family Bothidae. Native range: Eastern Atlantic, Senegal and Gulf of Guinea to Namibia. BiologyInhabits mud bottoms. Minimum depth reported from.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameMonolene microstomaFamilyBothidae (Lefteye flounders)OrderPleuronectiformes (Flatfishes)ClassActinopterygii (Ray-finned fishes)Maximum length20.1Depth range25–460 m (82–1509 ft)EnvironmentMarine; bathypelagic; depth range 25 - 460 mClimateDeep-waterDistributionEastern Atlantic: Senegal and Gulf of Guinea to Namibia.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: commercialResilienceMedium, minimum population doubling time 1.4 - 4.4 years (Assuming tmax>3) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026