operculatum, Scleronema Eigenmann [C. H.] 1917:691 [Proceedings of the American Philosophical Society v. 56; ref. 1237] Cacequy, Brazil [= Cacequi, rio Cacequi, rio Ibicuí basin, Rio Grande do Sul, about 29°53'58"S, 54°50'24"W]. Holotype: FMNH 58080 [ex CM 7077]. Paratypes: FMNH 58520 (3, ex CM 7539). Type catalog: Henn 1928:81 [ref. 12305], Ibarra & Stewart 1987:78 [ref. 12367], Ferraris 2007:413 [ref. 29155]. •Valid as Scleronema operculatum Eigenmann 1917 -- (Burgess 1989:304 [ref. 12860] as operculatus, Casciotta & Almirón 1996:52 [ref. 25534], de Pinna & Wosiacki in Reis et al. 2003:278 [ref. 27061], López et al. 2003:38 [ref. 27366], Menni 2004:82 [ref. 28131], Ferraris 2007:413 [ref. 29155], Litz & Koerber 2014:22 [ref. 33622], Fernández et al. 2015:14 [ref. 35041], Mirande & Koerber 2015:37 [ref. 35117], Bertaco et al. 2016:421 [ref. 34561], Nión et al. 2016:30 [ref. 35565], Ferrer & Malabarba 2020:53 [ref. 37587], Mirande & Koerber 2020:2 [ref. 37594], Ferrer 2021:249 [ref. 38890], Costa et al. 2022:92 [ref. 39059]). Current status: Valid as Scleronema operculatum Eigenmann 1917. Trichomycteridae: Trichomycterinae. Distribution: South America: Rio Ibicuí drainage, Uruguay River basin (Rio Grande do Sul, southern Brazil). Habitat: freshwater.