Trematomus

Trematomus is a genus of marine ray-finned fishes, belonging to the family Nototheniidae, the notothens or cod icefishes. These fishes occur in the Southern Ocean.

==Taxonomy== Trematomus was first described as a genus in 1902 by the Belgian-born British ichthyologist George Albert Boulenger when he described four new species of notothen from specimens collected on the Southern Cross Expedition. In 1938 John Roxborough Norman designated T. newnesi as the type species, this being the species described first in Boulenger's text. In 1982 Arkady Vladimirovich Balushkin created the new genus Pseudotrematomus, in which he placed all the species in Trematomus other than T. newnesi, but this classification has not been widely accepted. Some authorities place this genus in the subfamily Trematominae, but the 5th edition of Fishes of the World does not include subfamilies in the Nototheniidae. The generic name Trematomus is made up of trema which means "hole" or "opening" and "tomus" which means "cut", Boulenger explained that the "scapular fenestra being pierced in the scapula instead of between the latter and the coracoid".