xinguensis, Retroculus Gosse [J.-P.] 1971:7, Pl. 4 [Bulletin de l'Institut Royal des Sciences Naturelles de Belgique v. 47 (no. 43); ref. 7679] Rio Xingu, at Cachoeira von Martius, northern border of Mato Grosso, Brazil. Holotype: IRSNB 512. Paratypes: IRSNB 513 (orig. 15, now 8), 514 (orig. 18, now 10); MZUSP [ex IRSNB 513] (7), [ex IRSNB 514] (8). Non-type material: NMW 42482 (1), 42487 (1). Type catalog: Walschaerts 1987:37 [ref. 20755]. •Valid as Retroculus xinguensis Gosse 1971 -- (Kullander in Reis et al. 2003:641 [ref. 27061], Landim et al. 2015:378 [ref. 33860]). Current status: Valid as Retroculus xinguensis Gosse 1971. Cichlidae: Cichlinae. Distribution: Amazon River basin in Xingu and Tapajós River basins, Brazil. Habitat: freshwater.