heliacus, Hyphessobrycon Moreira [C. R.], Landim [M. I.] & Costa [W. J. E. M.] 2002:428, Figs. 1-2 [Copeia 2002 (no. 2); ref. 26016] Ribeirão Macuco (= Córrego Duas-bocas), tributary of rio Teles Pires, rio Tapajós basin, 71.9 kilometers north from Sinop, munic. Cláudia, Mato Grosso state, Brazil, 11°15'S, 55°19'W. Holotype: MZUSP 52891. Paratypes: MCP 20697 (12); MZUSP 52893 (15), 62940 (4 c&s), 62941-43 (3, 2, 1); UFRJ 4646 (4 c&s), 4647 (3); USNM 348911 (12). •Valid as Hyphessobrycon heliacus Moreira, Landim & Costa 2002 -- (Lima & Malabarba in Reis et al. 2003:137 [ref. 27061], Lucena 2003:95 [ref. 27437], Ingenito et al. 2013:38 [ref. 32568], Teixeira et al. 2014:613 [ref. 33097], Teixeira et al. 2016:474 [ref. 34088], Pastana & Ohara 2016:396 [ref. 34716]). Current status: Valid as Hyphessobrycon heliacus Moreira, Landim & Costa 2002. Acestrorhamphidae: Hyphessobryconinae. Distribution: Teles Pires River in upper Tapajós basin, Brazil. Habitat: freshwater.