Otothyropsis polyodon Calegari, Lehmann A., Reis, 2013 Fig. 27 Body elongated; greatest depth contained 6.8 to 8.1 times in SL; head length 2.6 to 3.0, pectoral-fin length 3.7 to 4.7 and pelvic-fin length 4.9 to 6.9 in SL; snout length 1.9 to 2.1, horizontal orbital diameter 6.1 to 7.5 and least interorbital width 2.6 to 3.1 in HL. Mouth inferior; premaxilla and dentary with 14-21 teeth. Longitudinal series with 24 or 25 plates. Dorsal fin with I,7, rarely 8, pectoral fin with I,6, pelvic fin with 6 and anal fin with 6 rays (Calegari et al., 2013). Ground color brown; dark-brown longitudinal stripe from snout to caudal fin. Hyaline fins, with dark-brown spots; upper caudal-fin lobe with dark-brown spot close to its tip; lower caudal-fin lobe dark, with hyaline portion on its lower portion, frequently with small dark-brown spots. Maximum standard length. 37.9 mm. Biological data. Males of O. polyodon have a conical urogenital papilla immediately posterior to the anus opening, longer pelvic-fin spine, shorter internarial distance, and shorter prenasal length (Calegari et al., 2013). Distribution. Rio Ocoí, tributaries of the rio Verde and the rio Iguatemi drainage, right bank of the upper rio Paraná. Remarks. Otothyropsis polyodon was identified as Hisonotus sp. by Graça, Pavanelli (2007). Besides, it has been captured in the rio Iguatemi drainage, tributary of the right bank of the upper rio Paraná, since 2008 by V. F. B. Silva and collaborators, with its first cytogenetic record provided by Fernandes et al. (2016).

{"references": ["Calegari BB, Lehmann-Albornoz P, Reis RE. Two new species of cascudinhos of the genus Otothyropsis (Siluriformes: Hypoptopomatinae) from the rio Parana basin, Brazil. Zootaxa. 2013; 3619 (2): 130 - 44.", "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.", "Fernandes CA, Bailly D, Sant'Ana DRA, Alves DS. First cytogenetic record for a species of Otothyropsis Ribeiro, Carvalho & Melo, 2005 (Loricariidae, Hypoptopomatinae). Neotrop Ichthyol [serial in the internet]. 2016 Apr 14 [cited 2016 Dec 08]; 14 (1): e 150123. Available from: http: // dx. doi. org / 10.1590 / 1982 - 0224 - 20150123"]}

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 81, DOI: 10.1590/1982-0224-20170094, http://zenodo.org/record/3678395