guentheri, Ancistrus Regan [C. T.] 1904:241, Pl. 12 (fig. 3) [Transactions of the Zoological Society of London v. 17 (pt 3, no. 1); ref. 3621] Guyana. Holotype (unique): BMNH 1978.3.2.1. Type catalog: Ferraris 2007:287 [ref. 29155]. •Valid as Pseudancistrus guentheri (Regan 1904) -- (Isbrücker 1980:10 [ref. 2303], Burgess 1989:429 [ref. 12860], Isbrücker 2001:25, 32 [ref. 25653], Isbrücker 2002:27 [ref. 27178], Fisch-Muller in Reis et al. 2003:394 [ref. 27061], Armbruster 2004:5 [ref. 27844], Ferraris 2007:287 [ref. 29155], Willink et al. 2010:41 [ref. 30670], Silva et al. 2014:2 [ref. 33302], Taphorn et al. 2022:53 [ref. 41297]). Current status: Valid as Pseudancistrus guentheri (Regan 1904). Loricariidae: Hypostominae. Distribution: South America: unknown locality (Guyana). Habitat: freshwater.