Steindachneridion scriptum (Miranda-Ribeiro, 1918)

Fig. 30

Body deep; greatest depth contained 5.8 to 6.3 times in SL; head length 2.4 to 3.2, anal-fin base length 8.4 to 8.8, adiposefin base length 8.0 to 10.0, maxillary-barbel length 2.4 to 2.9 in SL; snout length 2.0 to 2.2, horizontal orbital diameter 9.5 to 10.8, least interorbital width 4.4 to 4.8 in HL; orbital diameter 1.9 to 2.4 in interorbital width. Mouth terminal; dentigerous tooth plates in both premaxilla and dentary. Dorsal fin with 7, pectoral fin with I,9, pelvic fin with 7 and anal fin with 12-15 rays. Ground color greyish; dark-brown spots and irregular stripes on body. Dark-grey fins (Graça, Pavanelli, 2007).

Maximum standard length. 640.0 mm (Graça, Pavanelli, 2007).

Distribution. Río Uruguay and upper rio Paraná basins.