nijsseni, Apistogramma Kullander [S. O.] 1979:938, Figs. 1, 5 [Revue Suisse de Zoologie v. 86 (no. 4); ref. 8815] Río Copal, Jenaro Herrera, Río Ucayali system, Loreto, Peru. Holotype: MHNG 1595.82. Paratypes: MHNG 1595.83-85 (3), 1595.86-89 (4); NRM 11298 [ex MHNG 1595.89] (1); ZMA 116054 [ex MHNG 1959.83] (1). Type catalog: Nijssen et al. 1982:85 [ref. 19236], Kullander 1986:367 [ref. 12439], Weber 1998:12 [ref. 32707]. •Valid as Apistogramma nijsseni Kullander 1979 -- (Kullander 1986:188 [ref. 12439], Ortega & Vari 1986:20 [ref. 9708], Römer et al. 2003:28 [ref. 26768], Kullander in Reis et al. 2003:614 [ref. 27061], Staeck 2003:55 [ref. 27488], Römer et al. 2004:17 [ref. 34102], Römer et al. 2006:652 [ref. 28969], Römer et al. 2006:680 [ref. 28968], Römer & Hahn 2013:179 [ref. 32902], Römer et al. 2015:329 [ref. 34003], Staeck 2017:128 [ref. 35639], Meza-Vargas et al. 2021:27 [ref. 39298]). Current status: Valid as Apistogramma nijsseni Kullander 1979. Cichlidae: Cichlinae. Distribution: South America: Ucayali River drainage, upper Amazon basin (Peru). Habitat: freshwater.