HomeFish encyclopediaRay-finned fishesPerch-like fishWormfishesOlivaceous wormfish Olivaceous wormfish (Microdesmus affinis) Scientific name: Microdesmus affinis Meek & Hildebrand, 1928 The Olivaceous wormfish (Microdesmus affinis) is a marine fish of the family Microdesmidae. Native range: Eastern Central Pacific. Species factsScientific nameMicrodesmus affinisFamilyMicrodesmidae (Wormfishes)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)EnvironmentMarine; demersalClimateTropicalDistributionEastern Central Pacific.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