Original description as Acara guianensis:
- Regan, Charles Tate. 1905. "A revision of the fishes of the South-American cichlid genera Acara, Nannacara, Acaropsis, and Astronotus". Annals and Magazine of Natural History. (Ser. 7) v. 15: pp. 329-347 (crc00016)
Conservation: Krobia guianensis is not evaluated by the international union for the conservation of nature in the iucn red list of threatened species.