Dialommus macrocephalus, known commonly as the Foureye rockskipper in Mexico

Mexico

The United Mexican States , commonly known as Mexico , is a federal constitutional republic in North America. It is bordered on the north by the United States; on the south and west by the Pacific Ocean; on the southeast by Guatemala, Belize, and the Caribbean Sea; and on the east by the Gulf of...

 and the United Kingdom

United Kingdom

The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...

, is a species of labrisomid

Labrisomid

Labrisomids are small blennioids, perciform marine fish belonging to the family Labrisomidae. Found mostly in the tropical Atlantic and Pacific Ocean, the family contains approximately 98 species in 14 genera....

 blenny. It is a tropical blenny known from Mexico to Colombia

Colombia

Colombia, officially the Republic of Colombia , is a unitary constitutional republic comprising thirty-two departments. The country is located in northwestern South America, bordered to the east by Venezuela and Brazil; to the south by Ecuador and Peru; to the north by the Caribbean Sea; to the...

, in the eastern central Pacific Ocean

Pacific Ocean

The Pacific Ocean is the largest of the Earth's oceanic divisions. It extends from the Arctic in the north to the Southern Ocean in the south, bounded by Asia and Australia in the west, and the Americas in the east.At 165.2 million square kilometres in area, this largest division of the World...

. It was originally described by A. Günther, in 1861, as Clinus

Clinus

Clinus is a genus of clinids found in the southeastern Atlantic and western Indian ocean.-Species:* Sad klipfish, Clinus acuminatus * Agile klipfish, Clinus agilis...

 macrocephalus, and later reassigned as Mnierpes macrocephalus. Blennies in this species can reach a maximum length of 11 centimetres, and feed primarily off of benthic invertebrate

Invertebrate

An invertebrate is an animal without a backbone. The group includes 97% of all animal species – all animals except those in the chordate subphylum Vertebrata .Invertebrates form a paraphyletic group...

s. They have the ability to breathe air, and if kept moist, can remain out of water for up to four hours.