Peixes da planície de inundação do alto rio Paraná e áreas adjacentes: revised, annotated and updated
Ota, Renata Rúbia
Deprá, Gabriel de Carvalho
Graça, Weferson Júnio da
Pavanelli, Carla Simone
Neotropical Ichthyology
2018
2018-06-11
16
2
1
111
(Valenciennes, 1836)
Valenciennes
1836
[876,1403,1329,1353]
Actinopterygii
Anostomidae
Megaleporinus
GBIF
Animalia
Characiformes
20
21
Chordata
species
obtusidens
Fig. 5
Body elongated; greatest depth contained 3.2 to 3.5, caudal peduncle depth 8.6 to 8.9 times in SL; head length 3.2 to 3.8, predorsal distance 2.0 to 2.1, caudal peduncle length 7.0 to 7.9 inSL; snout length 2.0 to 2.2, horizontal orbital diameter 2.9 to 3.8 and least interorbital width 6.7 to 8.4 inHL. Mouth subterminal; premaxilla and dentary with 3 teeth, no maxillary teeth. Lateral line with 41-44 pored scales; transverse series above lateral line with 6 or 7 scale rows and below with 6 scale rows. Dorsal fin with 12, pectoral fin with 17, pelvic fin with 9, anal fin with 9 or 10 and caudal fin with 19 rays ( Britski et al., 2012). Ground color silvery; three dark-brown rounded blotches over lateral line. Dorsal fin whitish, pectoral, pelvic, anal and caudal fins yellowish ( Graça, Pavanelli, 2007). Maximum standard length. 350 mm( Graça, Pavanelli, 2007).
Distribution.Río de la Plata basin, Laguna dos Patos drainage, rio Parnaíba and rio São Francisco basins.
Remarks. Megaleporinus obtusidenswas identified as Leporinus elongatusby Graça, Pavanelli (2007). Ramirez et al.(2016) described the new genus, Megaleporinus, and proposed the new combination. Britski et al.(2012)redescribed Megaleporinus elongatusand M. obtusidens(under Leporinus), distinguishing them by the number of circumpeduncular scale rows ( 12 in M. elongatus; 16 in M. obtusidens), and restricting the distribution of M. elongatusto the rio Jequitinhonha and rio Pardo. In turn, the specimens identified as Leporinus obtusidensby Graça, Pavanelli (2007)belong to Megaleporinus piavussu, a species endemic to the upper rio Paranábasin.