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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.
The Odontobutidae, or freshwater sleepers, contains 22 species between 6 genera from eastern Asia. This family is the sister to all the other Gobiiformes in a clade with the Rhyacichthyidae. [1] Typhleotris madagascariensis a species in family Milyeringidae
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 .
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.
Eleotris melanosoma, the broadhead sleeper or dusky sleeper, is a species of fish in the family Eleotridae native to marine, fresh, and brackish waters from coastal eastern Africa through southern Asia to the islands of the western Pacific Ocean. This species can reach a length of 26 cm (10 in).
Butidae is a family of sleeper gobies in the order Gobiiformes.The family was formerly classified as a subfamily of the Eleotridae but the 5th Edition of Fishes of the World classifies it as a family in its own right. [2]
Valenciennea wardii, Ward's sleeper, Ward's sleeper goby, is a species of goby native to the Indian Ocean and the western Pacific Ocean in bays, reefs and lagoons at depths of from 12 to 35 metres (39 to 115 ft). It can be found on sandy or silty substrates.
Eleotris sandwicensis, commonly known as the Sandwich Island sleeper, the Hawaiian sleeper, or oʻopu, is a species of fish in the family Eleotridae. Endemic to the Hawaiian Islands , it can be found in marine, fresh, and brackish waters around the coast.