Tatia neivai (Ihering, 1930)

Fig. 18

Body elongated; greatest body depth contained 4.5 to 5.2 times in SL; head length 3.6 to 4.4 in SL; snout length 2.5 to 2.9, horizontal orbital diameter 4.8 to 5.2 and least interorbital width 1.7 to 2.0 in HL. Mouth terminal with dentigerous tooth plates in both premaxilla and dentary. Dorsal and pectoral fins with I,4 or 5, pelvic fin with 7 or 8 and anal fin with 7-11 rays. Ground color dark-brown with several light-beige horizontally elongated spots, as well as fins, especially unpaired fins (Graça, Pavanelli, 2007).

Maximum standard length. 68.0 mm (Graça, Pavanelli, 2007).

Distribution. Upper río Paraguay and upper rio Paraná basins.