Peixes da planície de inundação do alto rio Paraná e áreas adjacentes: revised, annotated and updated Author Ota, Renata Rúbia Author Deprá, Gabriel de Carvalho Author Graça, Weferson Júnio da Author Pavanelli, Carla Simone text Neotropical Ichthyology 2018 2018-06-11 16 2 1 111 journal article 10.1590/1982-0224-20170094 f68fe85c-2a4c-4625-b684-74f61398d6c2 1982-0224 3678395 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.