crassiceps, Rachoviscus Myers [G. S.] 1926:566, fig'd [Blätter für Aquarien- und Terrarienkunde v. 37 (no. 24); ref. 3094] Supposedly near Rio de Janeiro, Brazil [aquarium import]. Lectotype: USNM 92971. Paralectotypes: CAS-SU 18146 (1), USNM 94216 (3). Type catalog: Böhlke 1953:26 [ref. 12291]. Lectotype selected by Weitzman & Cruz 1980:1009 [ref. 8528]; they also suggest type locality probably is the region of Paranaguá, Brazil. Also as a separate, pp. 1-2. •Valid as Rachoviscus crassiceps Myers 1926 -- (Weitzman & Cruz 1981:1007 [ref. 8528], Lima in Reis et al. 2003:155 [ref. 27061], Reis et al. 2020:460 [ref. 38364], Bertaco 2022:102 [ref. 40102]). Current status: Valid as Rachoviscus crassiceps Myers 1926. Acestrorhamphidae: Thayeriinae. Distribution: South America: coastal River basins of Paraná and northern Santa Catarina states, southeastern Mata Atlantica (Brazil). Habitat: freshwater.