monoculus, Cychla Spix [J. B. von] & Agassiz [L.] 1831:100, Pl. 63 [Selecta genera et species piscium quos in itinere per Brasiliam; ref. 13] Brazilian seas. Syntypes or possible holotype: ?MHNN 2188 (1). Type catalog: Kottelat 1984:150 [ref. 21784]. Type information: Kottelat 1988:84 [ref. 13380]. As Cichla monoculus on plate. Type of status of MHNN doubtful -- see Kullander & Ferreira 2006:321, 324 [ref. 28883]. •Synonym of Cichla ocellaris Bloch & Schneider 1801 -- (Willis et al. 2012:18 [ref. 37399], Sabaj et al. 2020:84 [ref. 37398]). •Valid as Cichla monoculus Spix & Agassiz 1831 -- (Kullander 1986:51 [ref. 12439], Ortega & Vari 1986:20 [ref. 9708], Kullander 1986:51 [ref. 12439], Keith et al. 2000:162 [ref. 24547], Lasso & Machado-Allison 2000:72 [ref. 27968] with author as Spix, Lasso et al. 2001:101 [ref. 25928], Kullander in Reis et al. 2003:620 [ref. 27061], Staeck 2005:5 [ref. 28482], Kullander & Ferreira 2006:319 [ref. 28883], Reiss et al. 2012:61 [ref. 31910], Barriga Salazar 2014:118 [ref. 35745], Ramos et al. 2014:5 [ref. 35321], DoNascimiento 2016:541 [ref. 34727], Melo et al. 2016:135 [ref. 34701], Melo et al. 2016:377 [ref. 35317], DoNascimiento et al. 2017:96 [ref. 35633], Ng et al. 2019:536 [ref. 36606], Meza-Vargas et al. 2021:28 [ref. 39298], Chan et al. 2023:143 [ref. 40365]). Current status: Valid as Cichla monoculus Spix & Agassiz 1831. Cichlidae: Cichlinae. Distribution: South America: Amazon River basin and Oyapock River basin, northeastern Brazil: Brazil, Ecuador, Colombia, French Guiana, Peru and ?Venezuela. Introduced in Malaysia and Hong Kong (China). Habitat: freshwater.