arnoldi, Copeina Regan [C. T.] 1912:393 [Annals and Magazine of Natural History (Series 8) v. 10 (no. 58); ref. 14866] Amazon River. Syntypes: BMNH 1909.4.2.25-26 (2). See Planquette et al. 1996:178 [ref. 22818]. •Valid as Copella arnoldi (Regan 1912) -- (Weitzman & Weitzman in Reis et al. 2003:241 [ref. 27061], Zarske & Géry 2006:44 [ref. 29030], Zarske 2011:24 [ref. 30374], Mol et al. 2012:287 [ref. 32867], Phillip et al. 2013:15 [ref. 32896], Melo et al. 2016:133 [ref. 34701] as aff. arnoldi, Marinho & Menezes 2017:6 [ref. 35572], Urbano-Bonilla et al. 2018:86 [ref. 35773], Brosse et al. 2019:134 [ref. 38320], Koerber et al. 2022:27 [ref. 39235], Vieira et al. 2023:18 [ref. 40759], Marinho 2024:378 [ref. 40817]). Current status: Valid as Copella arnoldi (Regan 1912). Lebiasinidae: Pyrrhulininae. Distribution: South America: lower Amazon River and coastal Guianas to mouth of Orinoco River: Brazil, Colombia, French Guiana, Guyana, Suriname, Venezuela, and Trinidad and Tobago (introduced). Habitat: freshwater.