Hisonotus Eigenmann [C. H.] & Eigenmann [R. S.] 1889:40 Masc. Hisonotus notatus Eigenmann & Eigenmann 1889. Type by original designation (also monotypic). •Synonym of Otocinclus Cope 1871 -- (Isbrücker 1980:81 [ref. 2303]). •Synonym of Microlepidogaster Eigenmann & Eigenmann 1889 -- (Schaefer 1991:2 [ref. 18926], Schaefer 1997:8 [ref. 23213]). •Valid as Hisonotus Eigenmann & Eigenmann 1889 -- (Reis & Schaefer 1998:23 [ref. 23691], Schaefer 1998:377 [ref. 23692], Montoya-Burgos et al. 1998:367 [ref. 23850], Aquino et al. 2001:2 [ref. 25673], Isbrücker 2002:17 [ref. 27178], Britski & Garavello 2003:588 [ref. 27131], Schaefer in Reis et al. 2003:322 [ref. 27061], Almirón & Azpelicueta 2006:87 [ref. 28674], Azpelicueta & Almirón 2007:591 [ref. 29353], Britski & Garavello 2007:413 [ref. 29429], Cramer et al. 2007:56 [ref. 29959] and polyphyletic, Ferraris 2007:248 [ref. 29155], Carvalho et al. 2008:510 [ref. 29799], Carvalho & Reis 2009:1 [ref. 30193], Garvalho & Reis 2011:1 [ref. 31240], Carvalho & Datovo 2012:266 [ref. 32054], Martins & Langeani 2012:29 [ref. 32060], Roxo et al. 2013:319 [ref. 32527], Roxo et al. 2014:57 [ref. 33252], Lippert et al. 2014:242 [ref. 33355], Silva et al. 2014:107 [ref. 33533], Roxo et al. 2015:127 [ref. 33763], Roxo et al. 2015:104 [ref. 34024], Zawadzki et al. 2016:373 [ref. 34367], Roxo et al. 2016:227 [ref. 34426], Martins & Langeani 2016:1 [ref. 34533], Bertaco et al. 2016:418 [ref. 34561], Calegari et al. 2017:231 [ref. 35203], Roxo et al. 2018:[1] [ref. 35900], Dias et al. 2018:577 [ref. 36235], Roxo et al. 2019:161 [ref. 36538], Ribeiro-Silva et al. 2020:553 [ref. 37845]). Current status: Valid as Hisonotus Eigenmann & Eigenmann 1889. Loricariidae: Hypoptopomatinae.