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Ostariophysi is the second-largest superorder of fish. Members of this superorder are called ostariophysians. This diverse group contains almost 8,000 species, about 28% of known fish species in the world and 68% of freshwater species, and are present on all major continents except Antarctica. They have a number of common characteristics such as an alarm substance and a Weberian apparatus.〔 Members of this group include fish important to people for food, sport, the aquarium industry, and research. == Taxonomy == Currently, this superorder is divided into two series, Anotophysi and Otophysi. However, in older literature, Ostariophysi was restricted only to the fish that are currently classified under Otophysi.〔 Otophysi was coined in 1970 by Rosen and Greenwood to separate the traditional Ostariophysians from the added Gonorynchiformes.〔(【引用サイトリンク】title=Ostariophysi )〕 The superorder is classified below: *Series Anotophysi * * Gonorynchiformes, about 37 species *Series Otophysi (Euostariophysi) * * Cypriniformes (minnows and allies), about 3,268 species (contains Cyprinidae, largest family of freshwater fishes) * * Characiformes (characins and allies), at least 1,674 species * * Siluriformes (catfishes), about 1,727 species * * Gymnotiformes (electric eels, American knifefishes), at least 173 species (sometimes grouped under Siluriformes) The monophyly of Ostariophysi has come into question with molecular evidence. Gonorynchiformes is more closely related to Clupeiformes than Otophysi. It is possible that the Gonorynchiformes and Clupeiformes form a monophyletic group. There is evidence for a sister group relationship between Ostariophysi and Clupeomorpha (the taxon Ostarioclupeomorpha, also known as Otocephala, was coined to describe this possibly monophyletic group).〔〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ostariophysi」の詳細全文を読む スポンサード リンク
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