achirus, Pleuronectes Linnaeus [C.] 1758:268 [Systema Naturae, Ed. X v. 1; ref. 2787] Suriname. No types known. See Ramos in Reis et al. 2003:667 [ref. 27061] for discussion of distribution. •Valid as Achirus achirus (Linnaeus 1758) -- (Ortega & Vari 1986:21 [ref. 9708], Cervigón 1992:438 [ref. 23827], Cervigón 1996:15 [ref. 24489], Keith et al. 2000:248 [ref. 24547], Camargo & Isaac 2001:144 [ref. 27639], Munroe 2003:1929 [ref. 27118], Ramos in Reis et al. 2003:667 [ref. 27061], Ramos in Menezes et al. 2003:106 [ref. 27192], Dennis et al. 2004:84 [ref. 31601], Ramos et al. 2009:61 [ref. 30194], Marceniuk et al. 2017:42 [ref. 35324], see DoNascimiento et al. 2017:[25] [ref. 35679], Meza-Vargas et al. 2021:28 [ref. 39298], Rotundo et al. in Marceniuk et al. 2021:397 [ref. 38945], Bitencourt et al. 2022:4 [ref. 39848], Koerber et al. 2022:68 [ref. 39235], Carvalho-Filho 2023:265 [ref. 40480], Vieira et al. 2023:16 [ref. 40759]). Current status: Valid as Achirus achirus (Linnaeus 1758). Achiridae. Distribution: Western Atlantic: Venezuela east to Trinidad and Tobago, then south to Paraíba (Brazil); also in freshwater, reaching Peru in Amazon River. Habitat: freshwater, brackish, marine.