HomeFish encyclopediaRay-finned fishesFlatfishesLarge-tooth floundersFour twin-spot flounder Four twin-spot flounder (Pseudorhombus diplospilus) Scientific name: Pseudorhombus diplospilus Norman, 1926 The Four twin-spot flounder (Pseudorhombus diplospilus) is a marine fish of the family Paralichthyidae. Native range: Western Pacific, South China Sea to the Indo-Australian Archipelago (including Western Australia). BiologyDorsal spines (total): 0; Dorsal soft rays (total): 75-81; Anal spines: 0; Anal soft rays: 61 - 64. Pectoral fin on ocular side with 11-12 soft rays.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific namePseudorhombus diplospilusFamilyParalichthyidae (Large-tooth flounders)OrderPleuronectiformes (Flatfishes)ClassActinopterygii (Ray-finned fishes)Maximum length40.0Common length25.0Depth range10–75 m (33–246 ft)EnvironmentMarine; demersal; depth range 10 - 75 mClimateTropicalDistributionWestern Pacific: South China Sea to the Indo-Australian Archipelago (including Western Australia).Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: commercialResilienceMedium, minimum population doubling time 1.4 - 4.4 years (Preliminary K or Fecundity.) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026