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 Tatia neivai (Ihering, 1930) Fig. 18 Body elongated; greatest body depth contained 4.5 to 5.2 times in SL; head length 3.6 to 4.4 in SL; snout length 2.5 to 2.9, horizontal orbital diameter 4.8 to 5.2 and least interorbital width 1.7 to 2.0 in HL. Mouth terminal with dentigerous tooth plates in both premaxilla and dentary. Dorsal and pectoral fins with I,4 or 5, pelvic fin with 7 or 8 and anal fin with 7-11 rays. Ground color dark-brown with several light-beige horizontally elongated spots, as well as fins, especially unpaired fins ( Graça, Pavanelli, 2007 ). Maximum standard length. 68.0 mm ( Graça, Pavanelli, 2007 ). Distribution. Upper río Paraguay and upper rio Paraná basins.