HomeFish encyclopediaRay-finned fishesPerch-like fishWormfishesRearfin wormfish Rearfin wormfish (Microdesmus retropinnis) Scientific name: Microdesmus retropinnis Jordan & Gilbert, 1882 The Rearfin wormfish (Microdesmus retropinnis) is a marine fish of the family Microdesmidae. Native range: Eastern Central Pacific, Panama. BiologyType specimen collected from a rock pool.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameMicrodesmus retropinnisFamilyMicrodesmidae (Wormfishes)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)EnvironmentMarine; demersalClimateTropicalDistributionEastern Central Pacific: Panama.Conservation status (IUCN)Data deficient (DD)Threat 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