Checklist of the species of the Order Characiformes (Teleostei: Ostariophysi) Author Toledo-Piza, Mônica Author Baena, Eduardo G. Author Dagosta, Fernando C. P. Author Menezes, Naércio A. Author Ândrade, Marcelo Author Benini, Ricardo C. Author Bertaco, Vinicius A. Author Birindelli, José Luís O. Author Boden, Gert Author Buckup, Paulo A. Author Camelier, Priscila Author Carvalho, Fernando R. Author Castro, Ricardo M. C. Author Chuctaya, Junior Author Decru, Eva Author Derijst, Eddy Author Dillman, Casey B. Author Ferreira, Katiane M. Author Merxem, Dimitri G. Author Giovannetti, Victor Author Hirschmann, Alice Author Jégu, Michel Author Jerep, Fernando C. Author Langeani, Francisco Author Lima, Flávio C. T. Author Lucena, Carlos A. S. Author Lucena, Zilda Margarete S. Author Malabarba, Luiz R. Author Malabarba, Maria Cláudia S. L. Author Marinho, Manoela M. F. Author Mathubara, Kleber Author Mattox, George M. T. Author Melo, Bruno F. Author Moelants, Tuur Author Moreira, Cristiano R. Author Musschoot, Tobias Author Netto-Ferreira, André L. Author Ota, Rafaela P. Author T. Oyakawa, Osvaldo Author Pavanelli, Carla S. Author Reis, Roberto E. Author Santos, Osmar Author Serra, Jane Piton Author Silva, Gabriel S. C. Author Silva-Oliveira, Cárlison Author Souza-Lima, Rosana Author Vari, Richard P. Author Zanata, Angela M. text Neotropical Ichthyology 2024 e 230086 2024-02-02 22 1 http://dx.doi.org/10.1590/1982-0224-2023-0086 journal volume 10.1590/1982-0224-2023-0086 1982-0224 3A8C03AC-C66B-49B5-9269-E9A26ABA7EBF BRITTANICHTHYS Géry, 1965 MMF Marinho Brittanichthys Géry, 1965b:13 . Type species: Brittanichthys axelrodi Géry, 1965 . Type by original designation. Gender: Masculine. Brittanichthys axelrodi Géry, 1965 Brittanichthys axelrodi Géry, 1965b:22 , figs. 1–4 + 1 in color. Type locality: Rio Negro basin ( Brazil ), Praio (= beach) Bulufu on the Rio Itu ; the collecting place is about 80 km . upstream from the meeting with Rio Negro , about 0°30’S , 63°- 30’W. Holotype : USNM 198132 . Distribution: 314 (Géry, 1965b). Brittanichthys myersi Géry, 1965 Brittanichthys myersi Géry, 1965b:62 , figs. 5–8. Type locality: Rio Negro , Brazil , unnamed inlet on shore, at about 13 km . west of junction with the Amazon , 10 km . west of Manaus ; about 3°10’S , 59°55’W . Holotype : USNM 198131 . Distribution: 314 (Géry, 1965b). Remarks: The diagnosis proposed by Géry (1965b) does not seem to be persuasiveto distinguish Brittanichthys myersi from B. axelrodi . A taxonomic revision is necessary to check its validity.