mutabilis, Hyphessobrycon Costa [W. J. E. M.] & Géry [J.] 1994:74, Figs. 6-7 [Revue française d'Aquariologie Herpétologie v. 20 (no. 3) [for 1993]; ref. 21308] Tributary of Rio Sete de Setembro, rio Xingu basin, 107 kilometers southwest of Canarana, Mato Grosso, Brazil, 13°51'S, 52°40'W. Holotype: MNRJ 12438. Paratypes: UFRJ 1283 (7), 1284 (8, c&s), 1285 (31); MHNG 2542.20 (8); MNRJ 12439 (16); MZUSP 45292 (8), 45752-54 (4, 1, 3). Type catalog: Oyakawa 1996:469 [ref. 23140]. •Valid as Hyphessobrycon mutabilis Costa & Géry 1994 -- (Lima & Malabarba in Reis et al. 2003:138 [ref. 27061], Ohara & Lima 2015:570 [ref. 33846], Zarske 2015:295 [ref. 34028], Marinho et al. 2016:248 [ref. 34376], Dagosta et al. 2016:258 [ref. 34377], Marinho et al. 2016:519 [ref. 34591], Faria et al. 2020:374 [ref. 37543]). Current status: Valid as Hyphessobrycon mutabilis Costa & Géry 1994. Acestrorhamphidae: Hyphessobryconinae. Distribution: Upper Xingu River basin, Mato Grosso, Brazil. Habitat: freshwater.