HomeFish encyclopediaRay-finned fishesEels and MoraysMoray eelsGreyface moray Greyface moray (Gymnothorax thyrsoideus) Scientific name: Gymnothorax thyrsoideus Richardson, 1845 The Greyface moray (Gymnothorax thyrsoideus) is a marine fish of the family Muraenidae. Native range: Indo-Pacific, Christmas Island to French Polynesia, north to the Ryukyu Islands and south to Tonga; throughout Micronesia. BiologyVomerine teeth are biserial and diverging anteriorly with the posteriormost 3 to 4 teeth forming a single row.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameGymnothorax thyrsoideusFamilyMuraenidae (Moray eels)OrderAnguilliformes (Eels and Morays)ClassActinopterygii (Ray-finned fishes)Maximum length65.0Common length40.0Depth range0–3 m (0–10 ft)EnvironmentMarine; reef-associated; depth range 0 - 3 mClimateTropicalDistributionIndo-Pacific: Christmas Island to French Polynesia, north to the Ryukyu Islands and south to Tonga; throughout Micronesia.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