obscurum, Fluviphylax Costa [W. J. E. M.] 1996:122, Fig. 13 [Ichthyological Exploration of Freshwaters v. 7 (no. 2); ref. 22572] Rio Negro, Município de Barcelos, Estado do Amazonas, Brazil, approximately 0°56'39"S, 62°55'39"W. Holotype: MZUSP 49207. Paratypes: MZUSP 29370 (14), 29372 (36, 4 c&s), 29374 (7). Probably should be Fluviphylax obscurus. •Valid as Fluviphylax obscurum Costa 1996 -- (Costa & Le Bail 1999:1028 [ref. 24187], Ghedotti 2000:38 [ref. 27228]). •Valid as Fluviphylax obscurus Costa 1996 -- (Lazara 2001:121 [ref. 25711], Lucinda in Reis et al. 2003:558 [ref. 27061], Souza et al. 2011:412 [ref. 31782], DoNascimiento et al. 2017:102 [ref. 35633], Bragança 2018:135 [ref. 36227]). Current status: Valid as Fluviphylax obscurus Costa 1996. Fluviphylacidae. Distribution: Orinoco River basin, Brazil and Colombia. Habitat: freshwater.