HomeFish encyclopediaRay-finned fishesFlatfishesTonguefishesDark cheek tongue Dark cheek tongue (Symphurus undecimplerus) Scientific name: Symphurus undecimplerus Munroe & Nizinski, 1990 The Dark cheek tongue (Symphurus undecimplerus) is a marine fish of the family Cynoglossidae. Native range: Eastern Pacific, Mexico to Peru. BiologyDorsal spines (total): 0; Dorsal soft rays (total): 97-105; Anal spines: 0; Anal soft rays: 80 - 87; Vertebrae: 52 - 56Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameSymphurus undecimplerusFamilyCynoglossidae (Tonguefishes)OrderPleuronectiformes (Flatfishes)ClassActinopterygii (Ray-finned fishes)Maximum length14.2Common length12.5Depth range17–56 m (56–184 ft)EnvironmentMarine; demersal; depth range 17 - 56 m, usually 20 - 40 mClimateTropicalDistributionEastern Pacific: Mexico to Peru.Conservation status (IUCN)Least Concern (LC)Threat to humansHarmlessResilienceHigh, minimum population doubling time less than 15 months (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