Ariosoma opistophthalmum is an eel in the family Congridae (conger/garden eels).Ariosoma opistophthalmum at www.fishbase.org. It was described by Camillo Ranzani in 1839, originally under the genus Conger.Ranzani, C. 1839 [ref. 18606] De novis speciebus piscium. Dissertatio prima. Novi Commentarii Academiae Scientiarum Instituti Bononiensis v. 4 : 65-83, Pls. 8-13. It is a rare, non-migratory marine, deep water-dwelling eel which is known from the southwestern Atlantic Ocean around Brazil, where it ranges from Bahia to São Paulo. It is known to dwell at a depth range of 110–600 metres. Males can reach a maximum total length of 27.2 centimetres.
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