gnomus, Microcharacidium Buckup [P. A.] 1993:137, Fig. 16 [Ichthyological Exploration of Freshwaters v. 4 (no. 2); ref. 20831] Small stream (Río Orinoco drainage), 5°58'S, 67°36'W, about 25 kilometers from Puerto Ayacucho, Ature, Amazonas, Venezuela. Holotype: MBUCV-V-21790 [ex USNM 270155]. Paratypes: ANSP 169030 (20), 169032 (2, c&s); FMNH 101560 (6); UMMZ 220187 (11); USNM 270168 (185), 287985 (1, partly dissected), 288893 (1). Type catalog: Provenzano et al. 1998:12 [ref. 24196]. •Valid as Microcharacidium gnomus Buckup 1993 -- (Buckup 1993:327 [ref. 26741], Zarske 1997:171 [ref. 23714], Costa & Le Bail 1999:1028 [ref. 24187], Buckup in Reis et al. 2003:93 [ref. 27061], DoNascimiento et al. 2017:35 [ref. 35633], Vieira & Netto-Ferreira 2021:61 [ref. 38067]). Current status: Valid as Microcharacidium gnomus Buckup 1993. Crenuchidae: Characidiinae. Distribution: Negro and Orinoco River basins: Brazil, Venezuela and Colombia. Habitat: freshwater.