Trachelyopterus sp.

Fig. 18

Body deep; greatest body depth contained 4.0 to 4.3 times in SL; head length 4.2 to 4.5, anal-fin base length 2.9 to 3.1 in SL; snout length 3.6 to 3.7, horizontal orbital diameter 6.2 to 6.4 and least interorbital width 1.6 to 1.8 in HL. Mouth terminal with dentigerous tooth plates in both premaxilla and dentary. Dorsal fin with I,6, pectoral fin with I,7, pelvic fin with 8 and anal fin with 21-25 rays. Adipose fin absent. Ground color pale yellow to orange with several dark-brown irregular blotches as well as fins. Adipose fin absent (Graça, Pavanelli, 2007).

Maximum standard length. 128.0 mm (Graça, Pavanelli, 2007).

Distribution. Upper rio Paraná floodplain.