melanotus, Aphyocharax Eigenmann [C. H.] 1912:312 [Memoirs of the Carnegie Museum v. 5 (no. 1); ref. 1227] Rockstone sand-bank, Guyana. Holotype (unique): FMNH 53578 [ex CM 1877]. Type catalog: Henn 1928:58 [ref. 12305], Ibarra & Stewart 1987:10 [ref. 12367]. •Valid, placement uncertain -- (Weitzman & Palmer 1997:238 [ref. 22743]). •Valid as Microschemobrycon melanotus (Eigenmann 1912) -- (Malabarba in Reis et al. 2003:145 [ref. 27061], DoNascimiento et al. 2017:53 [ref. 35633], Ohara et al. 2019:333 [ref. 36615], Meza-Vargas et al. 2021:19 [ref. 39298], Taphorn et al. 2022:17 [ref. 41297], Marinho 2024:220 [ref. 40817]). Current status: Valid as Microschemobrycon melanotus (Eigenmann 1912). Characidae: Characinae. Distribution: South America: Orinoco, Essequibo, Purus and Amazon River basins (Brazil, Colombia, Guyana and Peru). Habitat: freshwater.