costae, Tetragonopterus Steindachner [F.] 1907:84 [Anzeiger der Kaiserlichen Akademie der Wissenschaften, Wien, Mathematisch-Naturwissenschaftliche Klasse v. 44 (no. 6) (for 28 Feb. 1907); ref. 20499] Rio São Francisco, Joazeiro, Rio Grande; Cidade da Barra, Santa Rita do Rio Prato, Brazil. Syntypes: (several) MNHN 1907-0178 [ex NMW] (4); MZUT 1682 (3); NMW 57391-98 (8?), 57401-06 (6?), 57408-09 (2?) 57411 (1); ZSM 7586-87 [ex NMW 57393] (2). Type catalog: Tortonese 1940:138 [ref. 21559], Bertin 1948:17 [ref. 19577], Neumann 2011:247 [ref. 31652]. •Valid as Moenkhausia costae (Steindachner 1907) -- (Benine 2002:293 [ref. 26541], Benine in Reis et al. 2003:146 [ref. 27061], Géry & Zarske 2004:42 [ref. 28287], Petrolli & Benine 2015:417 [ref. 33887], Azevedo-Santos & Benine 2016:208 [ref. 34837], Silva et al. 2020:6 [ref. 37809], Gurgel-Lourenço et al. 2023:75 [ref. 41056], Quintela et al. 2023:6 [ref. 40727], Marinho & Benine 2024:225 [ref. 40817], Vieira-Guimarães et al. 2024:39 [ref. 41258]). Current status: Valid as Moenkhausia costae (Steindachner 1907). Acestrorhamphidae: Stichonodontinae. Distribution: South America: São Francisco and Itapicuru River basins (Brazil). Introduced elsewhere. Habitat: freshwater.