Roeboides descalvadensis Fowler, 1932

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 : 35-36

Roeboides descalvadensis Fowler, 1932

Fig. 9

Body deep; greatest depth contained 2.2 to 2.7 and caudal peduncle depth 12.3 to 13.1 times in SL; head length 4.0 to 4.2, predorsal distance 1.9 to 2.0 and caudal peduncle length 12.8 to 13.5 in SL; snout length 3.6 to 4.4, horizontal orbital diameter 2.6 to 3.7 and least interorbital width 3.1 to 4.0 in HL. Mouth terminal; inner row of premaxilla with 6 teeth, outer with 4-6, inner row of dentary with 12-14, outer with 4-6 and maxilla with 9-11 teeth. Lateral line complete, with 66-71 pored scales; transverse series above lateral line with 13-16 scale rows and below with 8-10 scale rows. Dorsal fin with 10 or 11, pectoral fin with 11 or 12, pelvic fin with 9 or 10, anal fin with 50-55, and caudal fin with 19 rays. Ground color whitish; silvery longitudinal band on flank (brown or grey in preserved specimens), from humeral spot to caudal peduncle; black diffuse and oval, vertically elongated, humeral spot; one black spot on caudal peduncle, slightly forwarded prolonged. Yellowish fins ( Graça, Pavanelli, 2007).

Maximum standard length. 100.0 mm ( Graça, Pavanelli, 2007).

Distribution. Paraná-Paraguay system and Amazon basin.

Remarks. Roeboides descalvadensis was identified as R. paranensis by Graça, Pavanelli (2007). Lucena (2007) in a revisionary study of the Roeboides affinis (Günther, 1868) species-group, proposed the new synonym. Roeboides descalvadensis 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 ( Júlio Júnior et al., 2009).

Figures

Fig. 9. a. Oligosarcus paranensis, NUP 303, 82.0 mm SL, Fiú Reservoir (rio Apucaraninha), Tamarana, State of Paraná. b. Oligosarcus pintoi, NUP 1772, 68.4 mm SL, rio Piquiri, Mariluz, State of Paraná. c. Psellogrammus kennedyi, 30.5 mm SL, fresh specimen, uncat. d. Aphyocharax anisitsi, 38.6 mm SL, fresh specimen, uncat. e. Aphyocharax dentatus, 48.0 mm SL, fresh specimen, uncat. f. Aphyocharax sp., NUP 3225, 33.4 mm SL, lagoa do Bilunga, Taquarussu, State of Mato Grosso do Sul. g. Galeocharax gulo, NUP 263, 200.0 mm SL, rio Paraná, Porto Rico, State of Paraná. h. Roeboides descalvadensis, NUP 3286, 88.8 mm SL, lagoa do Bilunga, Taquarussu, State of Mato Grosso do Sul.