Corydoras aeneus (Gill, 1858)

Fig. 19

Body deep and elliptical; greatest depth contained 2.0 to 2.5 and caudal peduncle depth 7.8 to 8.4 times in SL; head length 3.1 to 3.8, predorsal distance 2.1 to 2.3 and maxillary-barbel length 5.3 to 5.5 in SL; snout length 1.8 to 1.9, horizontal orbital diameter 3.6 to 4.2 and least interorbital width 1.6 to 2.3 in HL. Mouth inferior. Lateral line with 4-6 pores on upper series of plates. Dorsolateral series with 20-23 and ventrolateral series with 19-22 plates. Dorsal fin with I,7 or 8, pectoral with I,8-10, pelvic fin with 6 and anal fin with 6-8 rays. Ground color dark-grey dorsally and yellowish ventrally; large black or dargrey regular spot in anterior region of flank. Grey fins, without spots (Graça, Pavanelli, 2007).

Maximum standard length. 52.0 mm (Graça, Pavanelli, 2007).

Distribution. Drainages from Colombia to the río de la Plata basin.