Hypostomus microstomus Weber, 1987

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 : 74

Hypostomus microstomus Weber, 1987

Fig. 24

Body deep; greatest body depth contained 4.0 to 4.7 and caudal peduncle depth 8.4 to 9.4 times in SL; head length 2.8 to 3.2, predorsal distance 2.4 to 2.5, dorsal-fin spine length 2.6 to 3.2, pectoral-fin spine length 2.8 to 3.1, adipose-fin spine length 13.5 to 6.0 and caudal peduncle length 3.0 to 3.5 in SL; snout length 1.4 to 1.6, horizontal orbital diameter 4.6 to 5.8 and least interorbital width 1.6 to 2.1 in HL. Mouth inferior; premaxilla with 8-14 and dentary with 10-16 teeth. Mid-lateral series with 24-27, predorsal series with 3, and dorsal-fin base series with 7 plates. Dorsal fin with I,7, pectoral fin with I,6, pelvic fin with i,5 and anal fin with 6 rays ( Weber, 1987). Ground color brown; scattered light-beige spot on body. Brown fins with light-beige spots, sometimes inconspicuous.

Maximum standard length. 300.0 mm ( Graça, Pavanelli, 2007).

Distribution. Río Paraná basin.

Remarks. Hypostomus microstomus 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. 24. a. Hypostomus iheringii, NUP 2577, 190.0 mm SL, rio Paraná, Porto Rico, State of Paraná.b. Hypostomus margaritifer, 235.0 mm SL, uncat. c. Hypostomus microstomus, NUP 1725, 165.0 mm SL, riacho Caracu, Porto Rico, State of Paraná. d. Hypostomus regani, NUP 2286, 170.0 mm SL, Corumbá Reservoir, Caldas Novas, State of Goiás. e. Hypostomus cf. strigaticeps, NUP 3190, 150.0 mm SL, rio Paraná, Porto Rico, State of Paraná. f. Hypostomus ternetzi, 210.0 mm SL, uncat.