Catathyridium jenynsii (Günther, 1862)

Fig. 32

Body deep; greatest body depth contained 1.5 to 1.8, caudal peduncle depth 4.1 to 6.0 and head depth 2.8 to 3.4 times in SL; caudal peduncle depth 2.7 to 4.0 in body depth; snout length 2.8 to 4.0, horizontal orbital diameter 8.7 to 15.9 and least interorbital width 6.1 to 11.8 in HL. Mouth terminal; premaxilla and dentary with several small conical teeth. Lateral line with 70-85 pored scales. Dorsal fin with 55-60, pelvic fin with 5 and anal fin with 40-44 rays. Ground color brownish; right side of body with dark-brown irregular spots; five or six dark-brown transverse stripes; left side of body with no pigmentation. Brown fins with dark-brown spots (Graça, Pavanelli, 2007).

Maximum standard length. 256.0 mm (Graça, Pavanelli, 2007).

Distribution. Rio Paraná and rio Uruguay basins.

Remarks. Catathyridium jenynsii is a non-native species from the upper rio Paraná and its occurrence can be associated with the filling of the Itaipu Reservoir and the consequent inundation of the Sete Quedas Falls.