Poptella Eigenmann [C. H.] 1908:106 Fem. Tetragonopterus longipinnis Popta 1901. Type by original designation (also monotypic). •Valid as Poptella Eigenmann 1908 -- (Géry 1977:367 [ref. 1597], Reis 1989:18 [ref. 14219], Taphorn 1992:302 [ref. 23654], Britski et al. 1999:56 [ref. 24147], Reis in Reis et al. 2003:210 [ref. 27061], Mirande 2009:7 [ref. 30267] in Characidae, Stethaprioninae, Mirande 2010:500 [ref. 31006] in Characidae, Tetragonopterinae, Oliveira et al. 2011:13 [ref. 31685] in Stethaprioninae, Garcia-Ayala & Benine 2019:1 [ref. 36770], Garcia-Ayala & Benine 2021:1 [ref. 38089], Garcia-Ayala & Benine 2023:1 [ref. 40179], Melo et al. 2024:22 [ref. 41541] in Stethaprioninae). Current status: Valid as Poptella Eigenmann 1908. Acestrorhamphidae: Stethaprioninae.