''Ecsenius lividanalis'', known commonly as the blue-head combtooth-blenny in

Indonesia Indonesia, officially the Republic of Indonesia, is a country in Southeast Asia and Oceania, between the Indian Ocean, Indian and Pacific Ocean, Pacific oceans. Comprising over List of islands of Indonesia, 17,000 islands, including Sumatra, ...

and also known as the blue-headed combtooth blenny, is a species of

combtooth blenny Combtooth blennies are blenny, blenniiformids; Percomorpha, percomorph marine fish of the family Blenniidae, part of the Order (biology), order Blenniiformes. They are the largest family of blennies with around 401 known species in 58 genera. Com ...

in the genus ''

Ecsenius ''Ecsenius'' is a large genus of fish in the family Blenniidae. Several species, including ''Ecsenius midas'', the Midas blenny, and ''Ecsenius bicolor'', the bicolor blenny, are commonly sold at aquarium stores as pets. Species There are curren ...

''. It is found in

coral reef A coral reef is an underwater ecosystem characterized by reef-building corals. Reefs are formed of colonies of coral polyps held together by calcium carbonate. Most coral reefs are built from stony corals, whose polyps cluster in group ...

s throughout the western

Pacific The Pacific Ocean is the largest and deepest of Earth's five oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean, or, depending on the definition, to Antarctica in the south, and is bounded by the cont ...

ocean. It can reach a maximum length of 5 centimetres. Blennies in this species feed primarily off of plants, including

benthic The benthic zone is the ecological region at the lowest level of a body of water such as an ocean, lake, or stream, including the sediment surface and some sub-surface layers. The name comes from the Ancient Greek word (), meaning "the depths". ...

algae Algae ( , ; : alga ) is an informal term for any organisms of a large and diverse group of photosynthesis, photosynthetic organisms that are not plants, and includes species from multiple distinct clades. Such organisms range from unicellular ...

and weeds, and are commercial

aquarium An aquarium (: aquariums or aquaria) is a vivarium of any size having at least one transparent side in which aquatic plants or animals are kept and displayed. fishkeeping, Fishkeepers use aquaria to keep fish, invertebrates, amphibians, aquati ...

fish. There are two colour forms of this blenny, both of which have a black spot around the anus. One form has a blue head with a yellow body and iris while the other form is dark, occasionally all yellow, with a bluish-white iris, a yellow back and a yellow

caudal fin Fins are moving appendages protruding from the body of fish that interact with water to generate thrust and help the fish swim. Apart from the tail or caudal fin, fish fins have no direct connection with the back bone and are supported only ...

References

* Chapman, W. M. and L. P. Schultz 1952 (24 Apr.) ''Review of the fishes of the blennioid genus Ecsenius, with descriptions of five new species.'' Proceedings of the United States National Museum v. 102 (3310): 507–528. lividanalis Fish described in 1952 {{Blenniidae-stub