Guyanancistrus niger

Species of catfish

Guyanancistrus niger is a species of catfish in the family Loricariidae that is of disputed classification. It is native to South America, where it occurs in the Oyapock basin in French Guiana. Though reportedly uncommon, it is typically seen in rapids where the species Pseudancistrus barbatus is also present, although the ecological relationship between the two is not known. The species reaches 15.9 cm (6.3 in) in standard length, although it has been reported to reach 25.4 cm, and it may be a facultative air-breather.

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