lorentzii, Achirus Weyenbergh [H.] 1877:13, Pl. 1 [Actas de la Academia Nacional de Ciencias Exactas, Buenos Aires. v. 3 (no. 1); ref. 14248] Río Paraná, Santa Fe, Argentina; Uruguay. Syntypes: (several) MSNG. •Valid as Catathyridium lorentzii (Weyenbergh 1877) -- (Ramos in Reis et al. 2003:668 [ref. 27061], Litz & Koerber 2014:36 [ref. 33622], Mirande & Koerber 2015:60 [ref. 35117], Bertaco et al. 2016:426 [ref. 34561], Nión et al. 2016:55 [ref. 35565] with author as Weyerberg, Koerber et al. 2017:82 [ref. 35267]). Current status: Valid as Catathyridium lorentzii (Weyenbergh 1877). Achiridae. Distribution: Paraguay and Uruguay River basins: Argentina, Brazil, Paraguay and Uruguay. Habitat: freshwater.