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Redtail catfish : ウィキペディア英語版
Redtail catfish
:''This article is about the South American redtail catfish. For the Asian redtail catfish, see ''Hemibagrus wyckioides''.''
The redtail catfish, ''Phractocephalus hemioliopterus'', is a pimelodid (long-whiskered) catfish. In Venezuela it is known as cajaro and in Brazil it is known as pirarara.〔 It is the only extant species of the genus ''Phractocephalus''. This fish is a common aquarium fish.
==Extinct ''Phractocephalus''==
Although the redtail catfish is the only living representative of this genus, there are other members that date back to the upper Miocene. ''P. nassi'' was described in 2003, and is from Urumaco, Venezuela. Another undescribed member is known to exist from Acre, Brazil.〔 (Paleobiology Database ) 〕 This genus has a minimum age of about 13.5 million years.〔

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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