HomeFish encyclopediaRay-finned fishesPuffers and FilefishesDeepwater boxfishesRigid boxfish Rigid boxfish (Caprichthys gymnura) Scientific name: Caprichthys gymnura McCulloch & Waite, 1915 The Rigid boxfish (Caprichthys gymnura) is a marine fish of the family Aracanidae. Native range: Eastern Indian Ocean, Australia (southern Western Australia and South Australia). Species factsScientific nameCaprichthys gymnuraFamilyAracanidae (Deepwater boxfishes)OrderTetraodontiformes (Puffers and Filefishes)ClassActinopterygii (Ray-finned fishes)Maximum length11.0Depth range40–200 m (131–656 ft)EnvironmentMarine; demersal; depth range 40 - 200 mClimateSubtropicalDistributionEastern Indian Ocean: Australia (southern Western Australia and South Australia).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