simplex, Fluviphylax Costa [W. J. E. M.] 1996:126, Fig. 15 [Ichthyological Exploration of Freshwaters v. 7 (no. 2); ref. 22572] Igarapé of Lago José-Açu, Parintins, Estado do Amazonas, Brazil, approximately 2°40'39"S, 56°40'39"W. Holotype: MZUSP 49209. Paratypes: MZUSP 5829 (25), 7817 (51), 15599 (31, 3 c&s), 42820 (9), 49058 (117, 3 c&s). •Valid as Fluviphylax simplex Costa 1996 -- (Costa & Le Bail 1999:1028 [ref. 24187], Lazara 2001:121 [ref. 25711], Lucinda in Reis et al. 2003:558 [ref. 27061], Souza et al. 2011:412 [ref. 31782], Bragança 2018:135 [ref. 36227]). Current status: Valid as Fluviphylax simplex Costa 1996. Fluviphylacidae. Distribution: Solimões-Amazonas River and lower Trombetas and Tapajós rivers, Brazil. Habitat: freshwater.