HomeFish encyclopediaRay-finned fishesFlatfishesSouthern floundersFinless flounder Finless flounder (Neoachiropsetta milfordi) Scientific name: Neoachiropsetta milfordi Penrith, 1965 The Finless flounder (Neoachiropsetta milfordi) is a marine fish of the family Achiropsettidae. BiologyDorsal spines: 0; Dorsal soft rays: 117-139; Anal spines: 0; Anal soft rays: 104 - 124; Vertebrae: 62 - 66. Brownish grey; median fins darker; pelvic fin on eyed side with 7 rays, on blind side 6-7 rays.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameNeoachiropsetta milfordiFamilyAchiropsettidae (Southern flounders)OrderPleuronectiformes (Flatfishes)ClassActinopterygii (Ray-finned fishes)Maximum length57.0Depth range100–1000 m (328–3281 ft)EnvironmentMarine; bathydemersal; depth range 100 - 1000 mClimateDeep-waterDistributionSouthwest Pacific: southern New Zealand. Southeast Pacific: off southern Chile. Southwest Atlantic: Argentina, the Falkland Islands and the Burdwood Bank. Southeast Atlantic: Discovery Seamount, off Cape Town. Antarctic Indian Ocean: Prince Edward and the Crozet Islands.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