Hexagrammidae, the greenlings, is a family of marine ray-finned fishes belonging to the suborder Cottoidei in the order Scorpaeniformes. These fishes are found in the North Pacific Ocean. Taxonomy Hexagrammidae was first proposed as a family in 1888 by the American ichthyologist David Starr Jordan. The 5th edition of Fishes of the World classifies this family as the only family in the monotypic superfamily Hexagrammoidea within the suborder Cottoidei of the diverse order Scorpaeniformes. Other workers have found that if the Scorpaeniformes, as delimited in Fishes of the World, is not included in the Perciformes it renders the Perciformes paraphyletic. These workers retain the Cottoidei as a suborder within the Perciformes while reclassifying Hexagrammoidea as the infraorder Hexagrammales. The family Zaniolepididae has been included within the Hexagrammidae, as the subfamilies Zaniolepidinae and Oxylebiinae, but Fishes of the World and Betancur et al classify these taxa as distinct from the Hexagrammidae. The palcing of these two families in their own monotypic superfamilies was originally proposed in 1994 by Gento Shinohara. Subfamilies and genera Hexagrammidae contains the following subfamilies and genera: Subfamily Ophiodontinae Jordan & Gilbert, 1883 Genus Ophiodon Girard, 1854 Subfamily Hexagramminae Jordan, 1888 Genus Hexagrammos Tilesius, 1810 Subfamily Pleurogramminae Rutenberg, 1954 Genus Pleurogrammus Gill, 1861 Characteristics Hexagrammidae have cirrhi but do not have ridges or spines on their heads, They have between one and five lateral lines and may have cycloid or ctenoid scales. There is a single dorsal fin which is notched and contains between 16 and 28 spines and 11 and 30 soft rays. There is a single spine and 5 soft rays in the pelvic fin. The front nostril on each side of the snout is well developed but the rear nostril may be absent or if it is there it is merely a small pore. The anal fin may have upn to 3 spines, or there may be no spines, and 6 or 7 soft rays. There is no swimbladder. The largest species is the lingcod (Ophiodon elongatus)which has a maximum publsihed total length of but typically they are or less in length. Distribution and habitat Hexagrammidae is endemic to the North Pacific Ocean where they are found in the subarctic and temperate regions, with a single species, the whitespotted greenling Hexagrammos stelleri, being found in the Arctic Ocean too. They occur from the intertidal zone to as deep as but most are found in waters