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The rock gunnel , or butterfish, is a species of marine ray-finned fish belonging to the family Pholidae, the gunnels. This species is found in the coastal waters of the North Atlantic Ocean and in the Atlantic part of the Arctic Ocean. The rock gunnel was first formally described in 1758 as Blennius gunnellus in the 10th edition of the Systema Naturae by Carl Linnaeus with the type locality given as the Atlantic. In 1777 by the Italian naturalist Giovanni Antonio Scopoli proposed the genus Pholis and Linnaeus's Blennius gunnellus was later designated to be its type species. The specific name gunnellis is a latinisation of an English, possibly originating in Cornwall, local name for this species, gunnel.

Source: Wikipedia