Cetopsis gobioides Kner, 1858

Fig. 19

Body elongated; greatest depth contained 3.7 to 3.9, head depth 4.9 to 5.0 and caudal peduncle depth 8.4 to 9.6 times in SL; head length 4.1 to 4.4, anal-fin base length 3.6 to 3.8, maxillary-barbel length 11.1 to 11.4 in SL; snout length 3.1 to 3.5, horizontal orbital diameter 7.8 to 8.6 and least interorbital width 2.4 to 2.8 in HL. Mouth terminal; premaxilla and dentary with viliform teeth, maxilla with no teeth and vomer with one row of conical teeth. Dorsal fin with 7, pectoral fin with 10 or 11, pelvic fin with 10 and anal fin with 21-24 rays. Ground color darker dorsally, lighter ventrally; dorsum with few scattered dark-grey chromatophores. Hyaline fins (Graça, Pavanelli, 2007).

Maximum standard length. 112.4 mm (Graça, Pavanelli, 2007).

Distribution. Upper rio São Francisco, río Paraná and río Uruguay basins.