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Idiastion is a small genus of marine ray-finned fish belonging to the family Scorpaenidae, the scorpionfishes. They are found in the Atlantic and Pacific oceans.
Idiastion was first described as a genus by the American ichthyologist William N. Eschmeyer in 1965 when he was describing its type species, Idiastion kyphos, from the southeastern Caribbean Sea, between Venezuela and Grenada.[2] Subsequently two more species have been added to the genus from the Pacific Ocean.[3] The genus is classified within the tribe Scorpaenini in the subfamily Scorpaeninae of the scorpionfish family Scorpaenidae.[4] The genus name Idiastion is the Greek word meaning "hermit" or "recluse", alluding to the rarity of the scorpionfishes at the depths at which Idiastion was collected from.[5]
There are currently three recognized species in this genus:[3]
Idiastion scorpionfishes have a deep body, deepest behind the head with a hump backed shape. They have well developed, robust spines which can have more than one point. They do not have an occipital pit behind their large eyes which have a suborbital ridge armed with between 5 and 8 spines. There are 4 spines on the preoperculum with the uppermost one being the longest and being located some distance from the other 3 spines. They have small, simple teeth on the jaws and the roof of the mouth. They have 12 spines and 9 soft rays in the dorsal fin and 3 spines and 5 soft rays in the anal fin. The pectoral fin has 17-19 rays, the central rays being the longest and the uppermist ray and bottom 7-9 rays are unbranched with the lower ones being fleshy with their tips protruding beyond the membrane. They have a complete lateral line with tubes on the scales and a small swim bladder.[6] These scorpionfishes are small fishes with standard lengths ranging from 5.3 cm (2.1 in) in I. kyphos and 12.3 cm (4.8 in) in I. pacificum.[3]
Idiastion scorpionfishes are found in the western Atlantic Ocean (I. kyphos), the Galápagos Islands (I. hageyi) and around Japan and over the Emperor Seamounts in the northwestern Pacific (I. pacificum).[3][7] They live close to the bottom over reefs and soft substrates.[6]
Idiastion is a small genus of marine ray-finned fish belonging to the family Scorpaenidae, the scorpionfishes. They are found in the Atlantic and Pacific oceans.
