Species that contain: Brachychalcinus and retrospina [ 2 ] records

paraguayensis, Fowlerina Eigenmann [C. H.] in Eigenmann, McAtee & Ward 1907:153 [Annals of the Carnegie Museum v. 4 (no. 2) (art. 7); ref. 1261] Descalvados, Mato Grosso, Brazil. Lectotype: BMNH 1895.5.17.200. Paralectotypes: BMNH 1892.4.20.36-38 (3), 1895.5.17.201-204 (4), 1895.5.17.205-207 (5). Based on the Paraguayan specimens of Tetragonopterus compressus Günther. Lectotype selected by Reis 1989:33 [ref. 14219]. See also the types of Brachychalcinus retrospina. •Synonym of Ephippicharax orbicularis (Valenciennes 1850), but a valid subspecies -- (Gómez & Chebez 1996:49 [ref. 23791]). •Valid as Poptella paraguayensis (Eigenmann 1907) -- (Reis 1989:32 [ref. 14219], Britski et al. 1999:56 [ref. 24147], Reis in Reis et al. 2003:210 [ref. 27061], López et al. 2003:21 [ref. 27366], Menni 2004:76 [ref. 28131], Mirande 2010:505 [ref. 31006], Sarmiento et al. 2014:50, 185 [ref. 35004], Mirande & Koerber 2015:21 [ref. 35117], Koerber et al. 2017:33 [ref. 35267], Garcia-Ayala et al. 2017:572 [ref. 35695], Garcia-Ayala & Benine 2019:7 [ref. 36770], Garcia-Ayala & Benine 2021:7 [ref. 38089]). Current status: Valid as Poptella paraguayensis (Eigenmann 1907). Characidae: Stethaprioninae. Distribution: South America: Paraguay and lower Paraná River basins: Argentina, Brazil, Bolivia and Paraguay. Habitat: freshwater.

retrospina, Brachychalcinus Boulenger [G. A.] 1892:12, Pl. 2 (fig. 2) [Annals and Magazine of Natural History (Series 6) v. 10 (no. 55) (art. 2); ref. 533] Santa Cruz, Mato Grosso, Brazil. Lectotype: BMNH 1892.4.20.36. Paralectotypes: BMNH 1892.4.20.37-38 (2) [according to Reis 1989 these belong to Poptella paraguayensis]. Lectotype selected by Eigenmann & Myers 1929:508 [ref. 1263]. •Valid as Brachychalcinus retrospina Boulenger 1892 -- (Reis 1989:70 [ref. 14219], Britski et al. 1999:56 [ref. 24147], Reis in Reis et al. 2003:209 [ref. 27061], Koerber et al. 2017:32 [ref. 35267], Garcia-Ayala et al. 2017:571 [ref. 35695], Garcia-Ayala et al. 2024:9 [ref. 40855]). Current status: Valid as Brachychalcinus retrospina Boulenger 1892. Characidae: Stethaprioninae. Distribution: South America: Paraguay River basin, Brazil and Paraguay. Habitat: freshwater.