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 Hypostomus ancistroides (Ihering, 1911) Fig. 23 Body deep; greatest body depth contained 4.2 to 4.7 and caudal peduncle depth 9.8 to 10.0 times in SL; head length 2.9 to 3.3, predorsal distance 2.3 to 2.6, dorsal-fin spine length 3.9 to 4.3, pectoral-fin spine length 3.7 to 3.9, adiposefin spine length 9.9 to 9.9 to 10.9 and caudal peduncle length 2.9 to 3.3 in SL; snout length 1.5 to 1.8, horizontal orbital diameter 6.5 to 7.3 and least interorbital width 2.4 to 2.7 in HL. Mouth inferior; premaxilla with 24-33 and dentary with 23-35 teeth. Mid-lateral series with 27 or 28, predorsal series with 3, and dorsal-fin base series with 8 or 9 plates. Dorsal fin with I,7, pectoral fin with I,6, pelvic fin with i,5 and anal fin with 6 rays. Ground color brown; dark-brown blotches on body, especially on dorsal region. Dark-brown fins with black spots. Maximum standard length. 276.0 mm ( Graça, Pavanelli, 2007 ). Distribution. Upper rio Paraná basin.