Hypostomus robertsoni Dias & Zawadzki, 2021: 13, fig. 5.

Holotype (Fig. 11): NUP 22740, 127.9 mm SL: Brazil, Paraná, Marialva, rio Keller, tributary of rio Ivaí, upper rio Paraná basin, 23°38’28”S, 51°51’31”W, C.H. Zawadzki, L.F. Pesenti, H.B. Ruiz & R. Vieira, 18 Aug 2014.

Paratypes: 8 lots, 110 specimens —NUP 2597, 34, 58.4–147.5 mm SL (18, 84.3–135.7 mm SL): Brazil, Paraná, Marialva, rio Keller, rio Ivaí basin, upper rio Paraná basin, 23°38’28”S, 51°51’31”W, C.H. Zawadzki & H.F. Julio Jr, 10 Dec 1996. NUP 17253 , 5, 88.9–108.9 mm SL: same locality as previous, L. Mommenshon, 15 Jun 2011. NUP 17255, 2, 76.2–111.9 mm SL: same locality as previous, H. B. Ruiz, Jun 2011 . NUP 3744, 37, 58.7–119.4 mm SL (19, 93.5–119.4 mm SL): Brazil, Paraná, Marialva, rio Keller, rio Ivaí basin, upper rio Paraná basin, 23°38’25”S, 51°51’32”W, C.H. Zawadzki & W.J. da Graça, 1 Mar 2005 . NUP 4842, 27, 89.8–122.0 mm SL (16, 92.0– 121.6 mm SL): Brazil, Paraná, Floresta, rio Ivaí, upper rio Paraná basin, Ivaí River, 23°42’01”S, 52°07’02”W, C.H. Zawadzki, 6 May 2003 . NUP 7062, 1, 89.4 mm SL: Brazil, Paraná, Campo Mourão, rio Mourão, rio Ivaí basin, upper rio Paraná basin, 24°02’23”S, 52°16’22”W, C.H. Zawadzki, R. Ota, H. Message & L. Mommenshon, 7 Apr 2009 . NUP 8535, 1, 172.5 mm SL: Brazil, Paraná, Turvo, rio Pedrinho, rio Ivaí basin, upper rio Paraná basin, 25°46’44”S, 51°25’35”W, D. Viana, 28 Feb 2009 . NUP 8536, 3, 139.3– 156.9 mm SL: Brazil, Paraná, Turvo, rio Bonito, rio Ivaí basin, upper rio Paraná basin, 24°45’30”S, 51°24’49”W, D. Viana, 23 Feb 2009 .

Remarks: The coordinates from the lot NUP 2597 were incorrectly stated as being 23°38’28”S, 51°31’31”W in the original description.