Hypostomus Lacepède [B. G. E.] 1803:144 [ref. 4930]. Masc. Hypostomus guacari Lacepède 1803 (= Acipenser plecostomus Linnaeus 1758). Type by monotypy. Hypostomus guacari Lacepède is an unneeded substitute for A. plecostomus. Spelled Hypostoma early authors. •Valid as Hypostomus Lacepède 1803 -- (Isbrücker 1980:17 [ref. 2303], Weber 1987 [ref. 6241], Burgess 1989:430 [ref. 12860], Reis et al. 1990 [ref. 16139], López & Miquelarena 1991:13 [ref. 23548], Mazzoni et al. 1994 [ref. 21507], Montoya-Burgos et al. 1998:367 [ref. 23850], Britski et al. 1999:135 [ref. 24147], Weber & Montoya-Burgos 2002:365 [ref. 26428], Isbrücker 2002:18 [ref. 27178], Ferraris 2003:865 [ref. 26999], Weber in Reis et al. 2003:355 [ref. 27061], Armbruster 2003:3 [ref. 27426], Armbruster 2004:53 [ref. 27644], Armbruster & de Souza 2005:2 [ref. 28321], Scharpf 2006:20 [ref. 30386], Armbruster et al. 2007:59 [ref. 29252], Birindelli et al. 2007:271 [ref. 29280], Ferraris 2007:250 [ref. 29155], Jerep et al. 2007:435 [ref. 29465], Zawadzki et al. 2008:396 [ref. 29845], Zawadzki et al. 2008:403 [ref. 29846], de Carvalho Paixão & Toledo-Piza 2009:563 [ref. 30675], Minckley & Marsh 2009:228 [ref. 31114], Carvalho et al. 2010:39 [ref. 30754], Zawadzki et al. 2010:719 [ref. 31074], Weber et al. 2012:195 [ref. 31999], Zawadzki et al. 2012:245 [ref. 32031], Cardosa et al. 2012:69 [ref. 32154], Martins et al. 2012:494 [ref. 32197]). Current status: Valid as Hypostomus Lacepède 1803. Loricariidae: Hypostominae.