Megalonema platanum (Günther, 1880) Fig. 28 Body elongate; greatest body depth contained 5.3 to 5.7, head depth 6.9 to 7.9, caudal peduncle depth 12.9 to 13.2 times in SL; head length 3.7 to 3.9, anal-fin base length 10.6 to 11.5, adipose-fin base length 4.3 to 4.5, and maxillarybarbel 1.3 to 1.8 in SL; snout length 2.0 to 2.2, horizontal orbital diameter 4.5 to 5.0 and least interorbital width 4.5 to 4.7 in HL. Mouth terminal; dentigerous tooth plates present in both premaxilla and dentary. Dorsal fin with 7, pectoral fin with 14 or 15, pelvic fin with 7, and anal fin with 9 or 10 rays. Ground color light-grey. Yellowish or hyaline fins (Graça, Pavanelli, 2007). Maximum standard length. 400.0 mm (Graça, Pavanelli, 2007). Distribution. Paraná-Paraguay system.

Published as part of Ota, Renata Rúbia, Deprá, Gabriel de Carvalho, Graça, Weferson Júnio da & Pavanelli, Carla Simone, 2018, Peixes da planície de inundação do alto rio Paraná e áreas adjacentes: revised, annotated and updated, pp. 1-111 in Neotropical Ichthyology 16 (2) on page 82, DOI: 10.1590/1982-0224-20170094, http://zenodo.org/record/3678395

{"references": ["Pavanelli CS, Graca WJ, Zawadzki CH, Britski HA, Vidotti AP, Avelino GS, Verissimo S. Fishes from the Corumba Reservoir, Paranaiba River drainage, upper rio Parana basin, State of Goias, Brazil. Check List. 2007; 3 (1): 58 - 64."]}