Phenacorhamdia tenebrosa (Schubart, 1964)

Fig. 21

Body elongated; greatest body depth contained 11.3 to 11.7, head depth 11.9 to 12.8 and caudal peduncle depth 15.6 to 17.1 times in SL; head length 5.0 to 5.6, anal-fin base length 6.3 to 7.3, adipose-fin base length 5.3 to 5.4 and maxillary-barbel length 6.6 to 7.3 times in SL; snout length 2.8 to 3.0, horizontal orbital diameter 9.1 to 12.2 and least interorbital width 4.4 to -6.1 times in HL. Mouth slightly prognathous; premaxilla and dentary with several diminute teeth. Dorsal fin with 7, pectoral fin with 8, pelvic fin with 6 and anal fin with 8 rays. Ground color pale yellow to pale brown; dark-brown transverse bars on dorsal region; darkbrown longitudinal, inconspicuous stripe along lateral line.

Maximum standard length. 86.4 mm (Graça, Pavanelli, 2007).

Distribution. Upper rio Paraná and rio São Francisco basins.