obi, Cyanocharax Casciotta [J. R.], Almirón [A. E.], Piálek [L.] & Říĉan [O.] 2012:41, Figs. 3-6 [Zootaxa No. 3391; ref. 32076] Río Paraná basin, tributary of the arroyo Paranay--Guazú, 26°52’28.9"S, 54°42’22.8"W, Misiones, Argentina. Holotype: MACN-ict 9560. Paratypes: MACN-ist 9557 (9), 9558 (3), 9559 (3), MACN-ict uncat. (1, c&s). Type catalog: Nadalin & López 2015:4 [ref. 34112]. •Valid as Cyanocharax obi Casciotta, Almirón, Piálek & Říĉan 2012 -- (Koerber 2014:4 [ref. 33621]), Mirande & Koerber 2015:22 [ref. 35117]. •Valid as Diapoma obi (Casciotta, Almirón, Piálek & Říĉan 2012) -- (Thomaz et al. 2015:Add. 5 [ref. 33893], Koerber et al. 2015:2 [ref. 35179], Koerber et al. 2017:3 [ref. 35083], Koerber et al. 2017:3 [ref. 35632], Koerber et al. 2019:3 [ref. 36736], Mirande & Koerber 2020:2 [ref. 37594], Ito et al. 2022:20 [ref. 39124]). Current status: Valid as Diapoma obi (Casciotta, Almirón, Piálek & Říĉan 2012). Stevardiidae: Diapominae. Distribution: South America: Río Paraná basin, Misiones Province (Argentina). Habitat: freshwater.