HomeFish encyclopediaRay-finned fishesVelifers, Tube-eyes and RibbonfishesTapertailsTapertail Tapertail (Radiicephalus elongatus) Scientific name: Radiicephalus elongatus Os?rio, 1917 The Tapertail (Radiicephalus elongatus) is a marine fish of the family Radiicephalidae. Native range: Eastern Atlantic, off Morocco and the Azores southward to Cape Point, South Africa. Eastern Pacific: present in the California Current region. BiologyDorsal spines: 0; Dorsal soft rays: 152-160; Anal spines: 0; Anal soft rays: 6 - 7; Vertebrae: 114 - 121. Body and tail silvery in color; dorsal base blackish. Branchiostegal rays: 4-6. Pelvic fins absent in adults.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameRadiicephalus elongatusFamilyRadiicephalidae (Tapertails)OrderLampriformes (Velifers, Tube-eyes and Ribbonfishes)ClassActinopterygii (Ray-finned fishes)Maximum length76.0Depth range570 m (1870 ft)EnvironmentMarine; pelagic-oceanic; depth range 570 - ? mClimateDeep-waterDistributionEastern Atlantic: off Morocco and the Azores southward to Cape Point, South Africa. Eastern Pacific: present in the California Current region.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