HomeFish encyclopediaRay-finned fishesScorpionfishes and FlatheadsFlatheadsLarge-spined flathead Large-spined flathead (Suggrundus macracanthus) Scientific name: Suggrundus macracanthus Bleeker, 1869 The Large-spined flathead (Suggrundus macracanthus) is a marine fish of the family Platycephalidae. BiologyDorsal spines (total): 9; Dorsal soft rays (total): 11-12; Anal spines: 0; Anal soft rays: 12 - 13. Preopercular spines 3, upper long, bayonet-like, reaching to or past opercular margin. Anterior 13-33 lateral line scales bearing a small spine or ridge. Iris lappet bilobed in adults, crenate in juveniles. Finger-like interopercular flap present. Total gill rakers on first arch 7-9, usually 8.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameSuggrundus macracanthusFamilyPlatycephalidae (Flatheads)OrderScorpaeniformes (Scorpionfishes and Flatheads)ClassActinopterygii (Ray-finned fishes)Maximum length26.0Common length18.0Depth range132 m (433 ft)EnvironmentMarine; demersal; non-migratory; depth range ? - 132 mClimateTropicalDistributionIndo-West Pacific: southern India and Sri Lanka to Malaysia, Gulf of Thailand, Hong Kong, Taiwan, Indonesia, Philippines, the Arafura Sea, Northwest Shelf of Australia to Coral Sea.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: minor commercialResilienceHigh, 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