depressum, Melanocharacidium Buckup [P. A.] 1993:117, Fig. 7 [Ichthyological Exploration of Freshwaters v. 4 (no. 2); ref. 20831] Rio Uatuma, about 2°10'S, 59°30'W, Amazonas, Brazil. Holotype: INPA 1738. Paratypes: INPA 1734 (4, 1 c&s), MZUSP 43667 (2). Type catalog: Oyakawa 1996:478 [ref. 23140]. •Valid as Melanocharacidium depressum Buckup 1993 -- (Buckup 1993:329 [ref. 26741], Buckup in Reis et al. 2003:92 [ref. 27061], DoNascimiento et al. 2017:[1] [ref. 35679], Taphorn et al. 2022:21 [ref. 41297]). Current status: Valid as Melanocharacidium depressum Buckup 1993. Crenuchidae: Characidiinae. Distribution: South America: Uatumã, Negro, and upper Orinoco River basins (Brazil, Guyana and Venezuela). Habitat: freshwater.