obscurus, Auchenipterus Günther [A.] 1863:442 [Annals and Magazine of Natural History (Series 3) v. 12 (no. 72); ref. 1973] Essequibo River, Guyana. Syntypes: BMNH 1864.1.21.13-14 (2). Type catalog: Ferraris 2007:1 [ref. 29155]. Also appeared in Günther 1864:195 [ref. 1974]. •Valid as Trachycorystes obscurus (Günther 1863) -- (Ferraris in Reis et al. 2003:479 [ref. 27061]). •Synonym of Trachycorystes trachycorystes (Valenciennes 1840) -- (Ferraris 2007:81 [ref. 29155], Britski & Akama 2011:274 [ref. 31386], Birindelli 2014:535 [ref. 33501]). Current status: Synonym of Trachycorystes trachycorystes (Valenciennes 1840). Auchenipteridae: Auchenipterinae. Distribution: Essequibo River basin, Guyana [if valid]. Habitat: freshwater.