The species Gymnolus anguillaris Hoedeman, 1962 has been collected all over Surinam. The authors suggest the possibility that G. anguillaris is widely distributed in South America, because it is hitherto confused with the closely related G. carapo Linnaeus, 1758. Besides it is proved that G. coropinae Hoedeman, 1962 has to be regarded as a synonym of G. anguillaris.

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Journal Beaufortia
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Nijssen, H, & Isbrücker, I.J.H. (1968). Gymnotus carapo and G. anguillaris (syn.: G. coropinae), two often confused species of gymnotid fishes (Pisces, Cypriniformes). Beaufortia, 15(203), 161–168.