alburnus, Tetragonopterus Hensel [R.] 1870:85 [Archiv für Naturgeschichte v. 36 (pt. 1); ref. 18277] Rio Cadea, Rio Grande do Sul, Brazil. Holotype (unique): ZMB 7477. Diapoma is neuter, but alburnus is an indeclinable noun. •Valid as Astyanax alburnus (Hensel 1870) -- (Malabarba 1987:126 [ref. 11587], Malabarba 1989:128 [ref. 14217], Azpelicueta et al. 2002:1053 [ref. 26511], Azpelicueta et al. 2002:244 [ref. 26608], Almirón et al. 2002:8 [ref. 26720], Buckup in Reis et al. 2003:107 [ref. 27061], Casciotta et al. 2003:333 [ref. 27401], Nión et al. 2016:29 [ref. 35565]). •Valid as Cyanocharax alburnus (Hensel 1870) -- (Malabarba & Weitzman 2003:91 [ref. 27141], Mirande 2010:534 [ref. 31006], Baicere-Silva et al. 2011:381 [ref. 31395], Casciotta et al. 2012:39 [ref. 32076], Protogino & Miquelarena 2012:581 [ref. 32123], Koerber 2014:4 [ref. 33621], Litz & Koerber 2014:13 [ref. 33622], Mirande & Koerber 2015:22 [ref. 35117], Petry et al. 2016:301 [ref. 34966], Nión et al. 2016:30 [ref. 35565]). •Valid as Diapoma alburnum (Hensel 1870) -- (Koerber et al. 2015:2 [ref. 35179], Koerber et al. 2019:3 [ref. 36736], Koerber et al. 2020:4 [ref. 37480], Mirande & Koerber 2020:2 [ref. 37594], Koerber et al. 2021:4 [ref. 38894], Ito et al. 2022:19 [ref. 39124], Koerber et al. 2023:5 [ref. 40355], Loureiro et al. 2023:64 [ref. 40506]). •Valid as Diapoma alburnus (Hensel 1870) -- (Thomaz et al. 2015:Add.5 [ref. 33893], Bertaco et al. 2016:413 [ref. 34561], Koerber & Litz 2016:2 [ref. 35098], Koerber et al. 2017:3 [ref. 35083], Koerber et al. 2017:3 [ref. 35632]). Current status: Valid as Diapoma alburnus (Hensel 1870). Characidae: Stevardiinae. Distribution: South America: Brazil, Argentina and Uruguay. Habitat: freshwater.