parnaibae, Brachychalcinus Reis [R. E.] 1989:77, Fig. 38 [Comunicações do Museu de Ciências da PUCRS, Série Zoologia v. 2 (no. 6); ref. 14219] Lagoas, Serra das Confusões, Caracol, Rio Parnaíba system, Piauí, Brazil. Holotype: MZUSP 36594. Paratypes: MZUSP 36595 (2). Type catalog: Oyakawa 1996:453 [ref. 23140]. •Valid as Brachychalcinus parnaibae Reis 1989 -- (Reis in Reis et al. 2003:209 [ref. 27061], Ramos et al. 2014:4 [ref. 35321], Melo et al. 2016:375 [ref. 35317], Garcia-Ayala et al. 2017:571 [ref. 35695], Koerber et al. 2022:32 [ref. 39235], Vieira et al. 2023:17 [ref. 40759], Garcia-Ayala et al. 2024:9 [ref. 40855]). Current status: Valid as Brachychalcinus parnaibae Reis 1989. Acestrorhamphidae: Stethaprioninae. Distribution: South America: Parnaíba River and Tocantins River basins (Brazil). Habitat: freshwater.