Hypostomus commersoni Valenciennes, 1836

Ota, Renata Rúbia, Deprá, Gabriel de Carvalho, Graça, Weferson Júnio da & Pavanelli, Carla Simone, 2018, Peixes da planície de inundação do alto rio Paraná e áreas adjacentes: revised, annotated and updated, Neotropical Ichthyology 16 (2), pp. 1-111 : 73

Hypostomus commersoni Valenciennes, 1836

Fig. 23

Body deep; greatest body depth contained 4.0 to 4.4 and caudal peduncle depth 9.0 to 10.5 times in SL; head length 3.0 to 3.3, predorsal distance 2.4 to 2.8, dorsal-fin spine length 2.6 to 3.4, pectoral-fin spine length 3.1 to 3.6, adipose-fin spine length 13.5 to 19.0 and caudal peduncle length 3.0 to 3.5 in SL; snout length 1.6 to 1.8, horizontal orbital diameter 6.7 to 9.5 and least interorbital width 2.4 to 2.8 in HL. Mouth inferior; premaxilla with 22-45 and dentary with 22-48 teeth. Mid-lateral series with 28-0, predorsal series with 3, and dorsal-fin base series with 8-10 plates. Dorsal fin with I,7, pectoral fin with I,6, pelvic fin with i,5 and anal fin with 6 rays. Ground color brown; black spots on body, smaller on head. Brown fins with black spots.

Maximum standard length. 270.0 mm ( Graça, Pavanelli, 2007).

Distribution. Río Paraná basin and Laguna dos Patos drainage.

Remarks. Hypostomus commersoni is a non-native species from the upper rio Paraná, and its occurrence can be associated with the filling of the Itaipu Reservoir and the consequent inundation of the Sete Quedas Falls.

Figures

Fig. 23. a. Ancistrus sp., 110.0 mm SL, uncat. b. Hypostomus albopunctatus, NUP 1761, 210.0 mm SL, Itaipu Reservoir, Santa Helena, State of Paraná. c. Hypostomus ancistroides, 140.0 mm SL, uncat. d. Hypostomus cochliodon, NUP 2556, 230.0 mm SL, Itaipu Reservoir, Santa Helena, State of Paraná. e. Hypostomus commersoni, NUP 856, 255.0 mm SL, Mourão Reservoir (rio Mourão, Campo Mourão, State of Paraná. f. Hypostomus hermanni, NUP 4927, 142.8 mm SL, rio Piquiri, tributary of the rio Paraná, Nova Laranjeiras, State of Paraná.