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Although goby-like in many ways, sleeper gobies lack the pelvic fin sucker and that, together with other morphological differences, is used to distinguish the two families. The Gobiidae and Eleotridae likely share a common ancestor and they are both placed in the order Gobiiformes, along with a few other small families containing goby-like fishes.
Butis butis, the crazy fish, duckbill sleeper, or upside-down sleeper, is a species of sleeper goby that are native to brackish and freshwater coastal habitats of the Indian Ocean and the western Pacific Ocean from the African coast to the islands of Fiji. They prefer well-vegetated waters and can frequently be found in mangrove swamps.
[3] [4] Gobiiforms are primarily small species that live in marine water, but roughly 10% of these species inhabit fresh water. This order is composed chiefly of benthic or burrowing species; like many other benthic fishes, most gobiiforms do not have a gas bladder or any other means of controlling their buoyancy in water, so they must spend ...
Goby is also used to describe some species which are not classified within the order Gobiiformes, such as the engineer goby or convict blenny Pholidichthys leucotaenia. [2] The word goby derives from the Latin gobius meaning " gudgeon ", [ 3 ] and some species of goby, especially the sleeper gobies in the family Eleotridae and some of the ...
They are especially diverse in New Guinea, Australia and New Zealand where they can be important components of brackish and freshwater ecosystems. [3] They are mostly quite small species but the marbled goby ( Oxyeleotris marmorata ) is a freshwater species of Buitdae from Southeast Asia that can grow to 65 cm (25.6 in) long and is an important ...
Sleeper goby may refer to three families of goby formerly classified as part of the single family Eleotridae, and a genus from the family Gobiidae: Milyeringidae, a family of Gobiiform cave fish from Western Australia and Madagascar; Butidae, an Old World family of gobies
Freshwater sleepers are a small family, the Odontobutidae, of gobiiform ray-finned fishes native to freshwater rivers flowing into the South China Sea and the northwestern Pacific Ocean. The family consists of about 22 species in six genera .
Valenciennea helsdingenii is a species of goby from the Indo-Pacific.It is commonly known as the twostripe goby, black-lined sleeper goby, or railway sleeper goby.It can grow up to a length of 25 cm (9.8 in) and is distinguishable by two prominent orange to black lines running longitudinally through its body.