melasemeion, Hyphessobrycon Fowler [H. W.] 1945:57, Fig. [The Fish Culturist v. 24 (no. 8); ref. 19306] Locality unknown (supposed to be lower Amazon). Holotype (unique): ANSP 71584. Type catalog: Böhlke 1984:51 [ref. 13621]. •Status uncertain -- (Weitzman & Palmer 1997:234 [ref. 22743]). •Valid as Hyphessobrycon melasemeion Fowler 1945 -- (Lima & Malabarba in Reis et al. 2003:138 [ref. 27061]). •Species inquirenda -- (Lima et al. 2024:205 [ref. 40817]). Nomen Dubium. Acestrorhamphidae: Hyphessobryconinae. Habitat: freshwater.