Fig. 1
Hypostomus cochliodon, lectotype, NMW 44101, 182.5 mm SL, rio Cuiabá, in lateral view.
Fig. 2
Hypostomus cochliodon, NUP 10807, 208.0 mm SL; dorsal (top), lateral (middle), and ventral (bottom) views.
Fig. 3
Opercle morphology of (a) Hypostomus cochliodon, NUP 10809, 215.8 mm SL, showing indistinct opercle without odontodes; (b) Hypostomus basilisko, holotype, MZUSP 111110, 182.5 mm SL and (c) Hypostomus khimaera, holotype, MZUSP 111129, 139.1 mm SL, showing layer of skin surrounding opercle that supports odontodes.
Fig. 4
Lateral view of juvenile in (a) Hypostomus cochliodon, NUP 11956, 92.8 mm SL, (b) Hypostomus basilisko, paratype, ZUFMS-PIS 3083, 64.2 mm SL and (c) Hypostomus khimaera, NUP 13494, 68.8 mm SL.
Fig. 5
Mouth and teeth of (a) Hypostomus cochliodon, NUP 10807, 208.0 mm SL, showing one series of papillae in inner face of upper and lower jaws; (b) Hypostomus basilisko, holotype, MZUSP 111110, 182.5 mm SL, showing the agglomerated papillae on inner face of upper and lower jaws; and (c) Hypostomus khimaera, MZUSP 111129, holotype, 139.1 mm SL, showing weakly developed papillae not forming series.
Fig. 6
Keels, ridges and odontodes of (a) Hypostomus cochliodon, NUP 10807, 208.0 mm SL, showing two weakly developed ridges in compound pterotic, weakly developed keels, few and weakly developed odontodes and predorsal keels weakly developed; (b) Hypostomus basilisko, holotype, MZUSP 111110, 182.5 mm SL, showing the three ridges on top of head, strongly developed keels, numerous welldeveloped odontodes on plates covering body and head and strong V-shaped predorsal keels; (c) Hypostomus khimaera, holotype, MZUSP 111129, 139.1 mm SL, showing moderately developed keels and dermal plates supporting moderately developed odontodes.
Fig. 7
Spots and color pattern of fins in Hypostomus cochliodon; (a) NUP 12071, 151.1 mm SL, showing spots smaller and closely spaced on head and larger and widely spaced on the body; (b) NUP 12768, 241.1 mm SL, the base of fin with same color of body, becoming dark brown in tip; and uniform spot pattern in ventral portion of body.
Fig. 8
Color pattern of live specimen of Hypostomus cochliodon (uncatalogued specimen) from córrego da Onça, Mato Grosso, rio Paraguay basin.
Fig. 9
Type locality of Hypostomus basilisko (yellow star), Hypostomus cochliodon (dark star) and Hypostomus khimaera (red star). The dark triangles represent areas of co-occurrence of Hypostomus cochliodon and Hypostomus khimaera; dark diamonds represent area of occurrence of Hypostomus cochliodon in the upper rio Paraná basin.
Fig. 10
Hypostomus basilisko, holotype, MZUSP 111110, 182.5 mm SL, córrego Salobrinha, rio Paraguay basin, Mato Grosso do Sul, Brazil; dorsal (top), lateral (middle), and ventral (bottom) views.
Fig. 11
Color pattern of live specimens of Hypostomus basilisko, paratypes (a) ZUFMS-PIS 3086, 150.5 mm SL, showing reddish-brown pattern; (b) ZUFMS-PIS 3086, 150.0 mm SL, showing yellowish-brown pattern.
Fig. 12
Sexual dimorphism of Hypostomus basilisko; (a) MNRJ 40184, paratype, 162.3 mm SL, showing pelvic-fin spine with no tumescence in adult female; (b) MNRJ 40184, paratype, 149.1 mm SL, showing a weakly developed tumescence (indicated by arrow) in juvenile male; (c) MZUSP 111110, holotype, 182.5 mm SL, showing well-developed tumescence (indicated by arrow) in adult male.
Fig. 13
Hypostomus khimaera, holotype, MZUSP 111129, 139.1 mm SL, from córrego Salobo, rio Paraguay basin, Mato Grosso State, Brazil; dorsal (top), lateral (middle), and ventral (bottom) views.
Fig. 14
Color pattern of live specimen of Hypostomus khimaera, ZUFMS-PIS 3738, 10.6 mm SL, rio Aquidauana, Mato Grosso do Sul, Brazil, showing the dark tan stripe along midline of flank and diffuse spots on the body.
