demerarae, Auchenipterus Eigenmann [C. H.] 1912:202, Pl. 21 (fig. 1) [Memoirs of the Carnegie Museum v. 5 (no. 1); ref. 1227] Wismar, Guyana. Holotype: FMNH 53248 [ex CM 1714]. Paratypes: CAS 57939 [ex IU 12091] (2), FMNH 53246 (1). Type catalog: Henn 1928:73 [ref. 12305], Ibarra & Stewart 1987:14 [ref. 12367], Ferraris 2007:72 [ref. 29155]. •Synonym of Auchenipterus nuchalus (Spix & Agassiz 1829) -- (Burgess 1989:241 [ref. 12860]). •Valid as Auchenipterus demerarae Eigenmann 1912 -- (Ferraris & Vari 1999:417 [ref. 23953], Ferraris in Reis et al. 2003:473 [ref. 27061], Ferraris 2007:72 [ref. 29155], Calegari et al. 2019:[96] [ref. 36961], Taphorn et al. 2022:43 [ref. 41297]). Current status: Valid as Auchenipterus demerarae Eigenmann 1912. Auchenipteridae: Auchenipterinae. Distribution: South America: Demerara, Rupununi, Essequibo and Cuyuni River basins (Guyana and Venezuela). Habitat: freshwater.