marmoratus, Helogenes Günther [A.] 1863:443 [Annals and Magazine of Natural History (Series 3) v. 12 (no. 72); ref. 1973] Essequibo River, Guyana. Lectotype: BMNH 1864.1.21.83. Paralectotypes (?): BMNH 1864.1.21.84 (1, lost). Type catalog: Ferraris 2007:134 [ref. 29155]. Lectotype selected by Vari & Ortega 1986:16 [ref. 5837]. •Valid as Helogenes marmoratus Günther 1863 -- (Ortega & Vari 1986:16 [ref. 9708], Burgess 1989:288 [ref. 12860], de Pinna & Vari 1995:3 [ref. 21651], Le Bail et al. 2000:148 [ref. 24549], Vari & Ferraris in Reis et al. 2003:258 [ref. 27061], de Pinna et al. 2007:801 [ref. 29247], Ferraris 2007:134 [ref. 29155], Barriga Salazar 2014:110 [ref. 35745], Sarmiento et al. 2014:190 [ref. 35004], DoNascimiento et al. 2017:84 [ref. 35633], Brosse et al. 2019:134 [ref. 38320], Meza-Vargas et al. 2021:24 [ref. 39298], Koerber et al. 2022:54 [ref. 39235]). Current status: Valid as Helogenes marmoratus Günther 1863. Cetopsidae: Helogeninae. Distribution: South America: Atlantic drainages of Guianas, upper Orinoco and Negro systems and upper Amazon River basin (Brazil, Colombia, Bolivia, Ecuador, French Guiana, Guyana, Peru, Suriname and Venezuela). Habitat: freshwater.