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 Characidium sp. Fig. 12 Body moderately deep; greatest body depth contained 3.4 to 4.0 and caudal peduncle depth 8.0 to 10.4 times in SL; head length 3.1 to 3.7, predorsal distance 1.9 to 2.1 and caudal peduncle length 6.3 to 7.5 in SL; snout length 3.6 to 4.5, horizontal orbital diameter 2.3 to 3.2 and least interorbital width 2.8 to 4.0 in HL. Mouth terminal; isthmus covered by scales; premaxilla with 7-9, dentary with 8-11 and maxilla toothless. Lateral line incomplete, with 9-12 pored scales; longitudinal series with 29-34 scales; transverse series above lateral line with 4-4½ scale rows and below with 3-3½ scale rows. Dorsal fin with 10-12, pectoral fin with 14, pelvic fin and anal fins with 7-9 rays, and caudal fin with 18-19 rays. Ground color pale yellow; dark-brown longitudinal stripe, occasionally inconspicuous, from humeral spot to caudal peduncle; nine to 10 dark-brown transverse bars; black spot on the base of median caudal-fin rays. Hyaline fins ( Graça, Pavanelli, 2007 ). Maximum standard length. 32.0 mm ( Graça, Pavanelli, 2007 ). Distribution. Upper rio Paraná floodplain and left-bank tributaries of the rio Paraná in the State of Paraná .