piauiensis, Apistogramma Kullander [S. O.] 1980:79, Fig. 11 [Bonner Zoologische Monographien No. 14; ref. 5526] Lagoa Seca, about 1 kilometer from camp on Rio Parnaiba at Barra do Longa, near Buriti dos Lopes, Brazil, 3°08'S, 41°54'W. Holotype: MCZ 46831. Paratypes: MCZ 46830 (1), 52212 (1). •Valid as Apistogramma piauiensis Kullander 1980 -- (Hein et al. 2002:18 [ref. 26552], Kullander in Reis et al. 2003:615 [ref. 27061], Staeck 2003:65 [ref. 27488], Schindler & Staeck 2013:305 [ref. 33110], Ramos et al. 2014:5 [ref. 35321], Melo et al. 2016:377 [ref. 35317], Staeck 2017:152 [ref. 35639], Koerber et al. 2022:70 [ref. 39235], Vieira et al. 2023:18 [ref. 40759]). Current status: Valid as Apistogramma piauiensis Kullander 1980. Cichlidae: Cichlinae. Distribution: South America: Parnaíba River basin (Brazil). Habitat: freshwater.