luteomaculatus, Plecostomus Devincenzi [G. J.] in Devincenzi & Teague 1942:20, Pl. 3 (figs. 2-3) [Anales del Museo Nacional de Historia Natural de Montevideo (Serie 2) v. 5 (no. 4); ref. 12268] Río Uruguay at Paysandú, Uruguay. Holotype (unique): MHNM CI 359. Type catalog: Olazarri et al. 1970:5 [ref. 23527], Ferraris 2007:256 [ref. 29155], Loureiro et al. 2016:412 [ref. 35150]. •Synonym of Hypostomus regani (Ihering 1905) -- (Reis et al. 1990:745 [ref. 16139]). •Valid as Hypostomus luteomaculatus (Devincenzi 1942) -- (Isbrücker 1980:27 [ref. 2303], Burgess 1989:431 [ref. 12860], López & Miquelarena 1991:32 [ref. 23548], Gómez & Chebez 1996:64 [ref. 23791], Sverlij et al. 1998:66 [ref. 27632] as Devincenzi & Teague, Isbrücker 2001:28, 31 [ref. 25653], Isbrücker 2002:19 [ref. 27178], López et al. 2003:51 [ref. 27366], Weber in Reis et al. 2003:359 [ref. 27061], Armbruster 2004:79 [ref. 27644] with author as Devicenzi & Teague, Menni 2004:81 [ref. 28131], Ferraris 2007:256 [ref. 29155], Zawadzki et al. 2012:246 [ref. 32031], Cardoso et al. 2012:77 [ref. 32154], Litz & Koerber 2014:25 [ref. 33622], Mirande & Koerber 2015:43 [ref. 35117], Nión et al. 2016:32 [ref. 35565], Zawadzki et al. 2017:12 [ref. 35355], Azevedo et al. 2021:9 [ref. 38203], Loureiro et al. 2023:107 [ref. 40506]). Current status: Valid as Hypostomus luteomaculatus (Devincenzi 1942). Loricariidae: Hypostominae. Distribution: South America: Uruguay River basin (Argentina, Brazil and Uruguay). Habitat: freshwater.