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''Chondrostoma'' (from the Ancient Greek roots (''khondros'', “lump”) + (''stoma'', “mouth”) = “lump-mouth”) is a genus of ray-finned fish in the family Cyprinidae. They are commonly known as nases, though this term is also used locally to denote particular species, most frequently the common nase (''C. nasus''). The common name refers to the protruding upper jaw of these fishes; it is derived from the German term ''Nase'', meaning "nose." Several species have a very restricted range. Some of these endemics are very rare nowadays, and at least one species is globally extinct. It is commonly described as a native species in Slovenia rivers and canals, as for example in the Sava. By its close colours, fins and shape, it can be confused with the common roach (Rutilus rutilus). == Systematics == In 2007 it was determined that the presumed monophyletic group consisted of six at least partly independent lineages of Leuciscinae, meaning that the rasping feeding apparatus evolved more than once. It was proposed to split the genus in six in consequence: ''Achondrostoma'', ''Chondrostoma'', ''Iberochondrostoma'', ''Pseudochondrostoma'', ''Protochondrostoma'' and ''Parachondrostoma''. But at least ''Achondrostoma'' and ''Iberochondrostoma'' may not be separable.〔Gante ''et al.'' (2007), Robalo ''et al.'' (2008)〕 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「Chondrostoma」の詳細全文を読む スポンサード リンク
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