niederleinii, Acharnes Holmberg [E. L.] 1891:181 [Revista Argentina de Historia Natural (Buenos Aires) v. 1; ref. 2192] Río Pequiri, Missiones, Argentina [possibly Río Pepiri-Guazú]. No types known. •Valid as Crenicichla niederleinii (Holmberg 1891) -- (Casciotta 1987:883 [ref. 6772], Ploeg 1991:120 [ref. 20196], Gómez & Chebez 1996:66 [ref. 23791], Kullander in Reis et al. 2003:629 [ref. 27061], López et al. 2003:76 [ref. 27366] as niederleini, Menni 2004:87 [ref. 28131] as niederleini, Casciotta et al. 2006:107 [ref. 28986], Casciotta et al. 2007:1 [ref. 29372], Casciotta & Almirón 2009:656 [ref. 30041], Kullander 2009:48 [ref. 30051], Piálek et al. 2010:34 [ref. 30903], Casciotta et al. 2010:643 [ref. 30975], Varella 2011:146 [ref. 37216], Kullander & Lucena 2013:149 [ref. 32675] with question, Mirande & Koerber 2015:57 [ref. 35117], Steinhäuser 2019:229 [ref. 36998]). •Nomen dubium -- (Varella et al. 2023:5 [ref. 40273]). Nomen Dubium. Current status: Uncertain as Crenicichla niederleinii (Holmberg 1891). Cichlidae: Cichlinae. Distribution: South America: upper Paraná River basin, Argentina and Brazil. Not in Paraguay [ref. 35267]. Habitat: freshwater.