HomeFish encyclopediaRay-finned fishesFlatfishesCrested floundersLarge-mouth righteye flounder Large-mouth righteye flounder (Samariscus macrognathus) Scientific name: Samariscus macrognathus Fowler, 1934 The Large-mouth righteye flounder (Samariscus macrognathus) is a marine fish of the family Samaridae. Native range: Western Pacific, west coast of Luzon, Philippines. BiologyDorsal soft rays (total): 67; Anal soft rays: 51; Vertebrae: 40. Upper jaw reaching to middle of lower eye, length about 2 times in head length. Head length about 3.8 times In SL (Ref 12933).Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameSamariscus macrognathusFamilySamaridae (Crested flounders)OrderPleuronectiformes (Flatfishes)ClassActinopterygii (Ray-finned fishes)Maximum length5.5Depth range82 m (269 ft)EnvironmentMarine; demersal; depth range 82 - 82 mClimateTropicalDistributionWestern Pacific: west coast of Luzon, Philippines.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: of no interest SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026