HomeFish encyclopediaRay-finned fishesPipefishes and SeahorsesPipefishes and seahorsesThorntailed pipefish Thorntailed pipefish (Micrognathus brevirostris pygmaeus) Scientific name: Micrognathus brevirostris pygmaeus Fritzsche, 1981 The Thorntailed pipefish (Micrognathus brevirostris pygmaeus) is a marine fish of the family Syngnathidae. BiologyDorsal spines (total): 0; Dorsal soft rays (total): 18-21; Anal spines: 0; Anal soft rays: 3. SL to 55 mm; R 15-16(15)+28-31: SL 2.6-3.3.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameMicrognathus brevirostris pygmaeusFamilySyngnathidae (Pipefishes and seahorses)OrderSyngnathiformes (Pipefishes and Seahorses)ClassActinopterygii (Ray-finned fishes)Maximum length6.0Depth range2–12 m (7–39 ft)EnvironmentMarine; reef-associated; depth range 2 - 12 mClimateTropicalDistributionIndo-Pacific: Moluccas to Society Islands, north to Marshall Islands; south to New Caledonia; Palau, Mariana Islands, and Marshall Islands in Micronesia. Reported from Christmas Island.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceHigh, 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