| Idiastion | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | Scorpaeniformes |
| Family: | Scorpaenidae |
| Tribe: | Scorpaenini |
| Genus: | Idiastion Eschmeyer, 1965 |
| Type species | |
| Idiastion kyphos Eschmeyer, 1965 [1] | |
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]
Scorpaenodes is a widespread genus of marine ray-finned fish belonging to the family Scorpaenidae, the scorpionfishes. The fishes in this genus are found to the Atlantic, Indian and Pacific Ocean.
Sebastapistes is a genus of marine ray-finned fish belonging to the family Scorpaenidae, the scorpionfishes. The fishes in this genus are found in the Indian and Pacific Ocean.
Scorpaenopsis is a genus of marine ray-finned fish belonging to the family Scorpaenidae, the scorpionfishes. The fishes in this genus are found in the Indian and Pacific Ocean.
Scorpaena is a widespread genus of marine ray-finned fish belonging to the family Scorpaenidae, the scorpionfishes.
Rhinopias is a genus of marine ray-finned fish belonging to the family Scorpaenidae, the scorpionfishes. The species in this genus are found in the Indian and Pacific oceans.
Pteroidichthys is a genus of marine ray-finned fish belonging to the family Scorpaenidae, the scorpionfishes. The scorpionfishes in this genus are distributed in the Indian and Pacific Oceans.
Pontinus is a genus of marine ray-finned fish belonging to the family Scorpaenidae, the scorpionfishes. The scorpionfishes in this genus are distributed in the tropical and warm temperate parts Atlantic, Indian and Pacific Oceans.
Phenacoscorpius, the no-lined scorpionfishes, is a genus of marine ray-finned fish belonging to the family Scorpaenidae, the scorpionfishes. They are native to the western Atlantic, Pacific and Indian oceans.
Neomerinthe is a genus of marine ray-finned fish belonging to the family Scorpaenidae, the scorpionfishes. They are found in Atlantic, Indian and Pacific Ocean.
Parapterois is a genus of marine ray-finned fishes belonging to the family Scorpaenidae, the scorpionfishes. These fish originate from marine environments in the Indian Ocean or near it. The venomous Parapterois heterura is occasionally seen as an aquarium fish.
The spotfin scorpionfish is a species of marine ray-finned fish belonging to the family Scorpaenidae, the scorpionfishes. It is known from the western Indian Ocean This species is the only known member of the genus Neoscorpanea.
Rhinopias frondosa, the weedy scorpionfish or the weed fish, is a species of marine ray-finned fish belonging to the family Scorpaenidae, the scorpionfishes. This species is found in the Indo-West Pacific. It is a rare but highly desirable fish in the aquarium trade.
The flasher scorpionfish, or rough humpback scorpionfish is a species of venomous marine ray-finned fish belonging to the family Scorpaenidae, the scorpionfishes. This species is found in the western Pacific Ocean.
Pontinus furcirhinus, one of a number of species known as the "red scorpionfish", is a species of marine ray-finned fish belonging to the family Scorpaenidae, the scorpionfishes. It is found in the eastern Pacific Ocean.
Scorpaena cocosensis, the Cocos scorpionfish, is a species of marine ray-finned fish belonging to the family Scorpaenidae, the scorpionfishes. It is found in the eastern Pacific Ocean.
Ectreposebastes is a genus of marine ray-finned fish, belonging to the subfamily Setarchinae, the deep-sea bristly scorpionfishes, part of the family Scorpaenidae. The genus is found in the Atlantic, Indian and Pacific Oceans.
Lioscorpiusis a genus of marine ray-finned fish, belonging to the subfamily Setarchinae, the deep-sea bristly scorpionfishes, part of the family Scorpaenidae. They are native to the western Pacific Ocean.
Pacific spotted scorpionfish, or the stone scorpionfish, is a species of marine ray-finned fish belonging to the family Scorpaenidae, the scorpionfishes. It is found in the eastern Pacific Ocean. It is the largest species in the genus Scorpaena and, like the other species in that genus, it is protected by venomous spines.
Scorpaenodes guamensis, the Guam scorpionfish or common scorpionfish, is a species of venomous, marine, ray-finned fish belonging to the family Scorpaenidae, the scorpionfishes. It has a wide Indo-Pacific distribution.
The humpbacked scorpionfish is a species of venomous marine ray-finned fish belonging to the family Scorpaenidae, the scorpionfishes. This species is found in the western Indian Ocean.