arianae, Hyphessobrycon Uj [A.] & Géry [J.] 1989:148, Figs. 2-4 [Revue Suisse de Zoologie v. 96 (no. 1); ref. 16287] Río Güyraugua, tributary of Río Monday, 3 kilometers east of Juan Frutos, Caaguazu, Paraguay. Holotype: MHNG 2412.79. Paratypes: MHNG 2412.80-81 (34, 4 c&s). Type catalog: Weber 1998:7 [ref. 32707]. •Valid as Hyphessobrycon arianae Uj & Géry 1989 -- (Almirón & Casciotta 1999:345 [ref. 24405], Lima & Malabarba in Reis et al. 2003:134 [ref. 27061], Almirón et al. 2004:674 [ref. 27987], Carvalho & Langeani 2013:526 [ref. 32913], Koerber et al. 2017:40 [ref. 35267], Lima et al. 2024:183 [ref. 40817]). Current status: Valid as Hyphessobrycon arianae Uj & Géry 1989. Characidae: Stethaprioninae. Distribution: South America: Paraná River basin, Paraguay. Habitat: freshwater.