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''Rhinichthys'', known as the riffle daces, is a genus of freshwater fish in the carp family (Cyprinidae) of the order Cypriniformes. The type species is ''Rhinichthys atratulus'', the blacknose dace. ''Rhinichthys'' species range throughout North America. The genus contains eight living species, one of which (the loach minnow) is considered Vulnerable. It also includes the extinct Las Vegas dace, which was only first described in 1984 and had disappeared by 1986. The cheat minnow (''Pararhinichthys bowersi''), a natural hybrid of the longnose dace (''R. cataractae'') and the river chub (''Nocomis micropogon''), was formerly placed in this genus, but is now valid under ''Pararhinichthys''. The riffle daces are a basal lineage in an insufficiently resolved clade of American Leuciscinae. Such a group had been proposed on anatomical evidence, and was verified using mtDNA 12S rRNA sequences.(Simons & Mayden 1997) ==Species== * ''Rhinichthys atratulus'' (Hermann, 1804) (Blacknose dace) * ''Rhinichthys cataractae'' (Valenciennes, 1842) (Longnose dace, nooksack dace) * ''Rhinichthys cobitis'' (Girard, 1856) (Loach minnow) * †''Rhinichthys deaconi'' R. R. Miller, 1984 (Las Vegas dace) * ''Rhinichthys evermanni'' Snyder, 1908 (Umpqua dace) * ''Rhinichthys falcatus'' (C. H. Eigenmann & R. S. Eigenmann, 1893) (Leopard dace) * ''Rhinichthys obtusus'' Agassiz, 1854 (Western blacknose dace) * ''Rhinichthys osculus'' (Girard, 1856) (Speckled dace) * ''Rhinichthys umatilla'' (C. H. Gilbert & Evermann, 1894) (Umatilla dace) 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「Rhinichthys」の詳細全文を読む スポンサード リンク
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