copei, Tetragonopterus Steindachner [F.] 1882:179 [Anzeiger der Kaiserlichen Akademie der Wissenschaften in Wien, Mathematisch-Naturwissenschaftlichen Klasse v. 19 (no. 19); ref. 20487] Santarém, Amazon River, Pará, Brazil. Syntypes: (several) ?MCZ 89960 (30) Obidos; NMW 57383 (5). Species later illustrated and described in more detail in Steindachner 1882:35, Pl. 6 (fig. 6) [ref. 14353]. •Valid as Moenkhausia copei (Steindachner 1882) -- (Taphorn 1992:269 [ref. 23654], Benine 2002:293 [ref. 26541], Benine in Reis et al. 2003:146 [ref. 27061], Petrolli et al. 2016:168 [ref. 34395], Azevedo-Santos & Benine 2016:208 [ref. 34837], Soares & Bührnheim 2016:399 [ref. 34972], DoNascimiento et al. 2017:51 [ref. 35633], Urbano-Bonilla et al. 2018:90 [ref. 35773], Meza-Vargas et al. 2021:19 [ref. 39298], Taphorn et al. 2022:17 [ref. 41297], Cortés Hernández et al. 2023:455 [ref. 40760], Marinho & Benine 2024:225 [ref. 40817]). •Valid as Hemigrammus copei (Steindachner 1882) -- (Melo et al. 2024:24 [ref. 41541]). Current status: Valid as Hemigrammus copei (Steindachner 1882). Acestrorhamphidae: Pristellinae. Distribution: South America: Amazon and Orinoco River basins (Brazil, Colombia, Guyana, Peru and Venezuela). Habitat: freshwater.