isognathus, Schizodon Kner [R.] 1858:78 [Sitzungsberichte der Kaiserlichen Akademie der Wissenschaften. Mathematisch-Naturwissenschaftliche Classe v. 30 (no. 13); ref. 13404] Rio Cuiabá, Brazil. Lectotype: NMW 58855. Paralectotype: (1) not found. Appeared in more detail in Kner 1859:163, Pl. 13 [ref. 2631]. See also Vari & Raredon 1991:19 [ref. 19023]. Lectotype selected by Sidlauskas et al. 2007:720 [ref. 29265]. •Valid as Schizodon isognathus Kner 1858 -- (Taphorn 1992:63 [ref. 23654], Gómez & Chebez 1996:53 [ref. 23791], Britski et al. 1999:80 [ref. 24147], Garavello & Britski in Reis et al. 2003:80 [ref. 27061], López et al. 2003:15 [ref. 27366], Sidlauskas et al. 2007:717 [ref. 29265], Sarmiento et al. 2014:41, 183 [ref. 35004], Koerber et al. 2017:19 [ref. 35267], Ramírez et al. 2020:[6] [ref. 37803], Meza-Vargas et al. 2021:15 [ref. 39298], Birindelli 2024:67 [ref. 40817]). Current status: Valid as Schizodon isognathus Kner 1858. Anostomidae. Distribution: South America: Paraguay River basin (Bolivia, Brazil, Paraguay and Peru). Habitat: freshwater.