Par Heraldo A. Britski1 José Luís o. Birindelli1 Julio ces ArgaraVello
Leporinus obtusidens Valenciennes, 1837 and L. elongatus Valenciennes, 1850 are rede- scribed based on the type specimens, including those of their junior synonyms, and recently collected specimens. Leporinus obtusidens is considered to be widespread, occuring in the river drainages of La Plata, São Francisco, and Parnaíba. Leporinus aguapeiensis Campos, 1945, described from the upper Rio Paraná, and L. silvestrii Boulenger, 1902, described from the Rio Paraguay, are considered junior synonyms of L. obtusidens. Leporinus elongatus is endemic to the Rio Jequitinhonha and Rio Pardo, two eastern Brazilian river basins, and the locality cited for the lectotype, Rio São Fransico, likely to be erroneous. Leporinus crassilabris Borodin, 1929, and L. crassilabris breviceps Borodin, 1929, both described from the Rio Jequitin- honha, are considered junior synynoms of L. elongatus. A new species of Leporinus, endemic to the upper Rio Paraná, very similar and sometimes mistaken with L. obtusidens, is formally described. In addition, comments on Leporinus pachyurus Valenciennes, 1850 and on L. bi- maculatus Castelnau, 1855 are provided, and a lectotype for L. bimaculatus is selected.
Nouvelle espèce décrite : Leporinus piavussu du Rio Mogi Guaçu, at Cachoeira de Emas (21°55’35”S, 47°21’59”W), Pirassununga, São Paulo, 01-06 May 1963, Excursão do Departamento de Zoologia da Secretaria de Agricultura do Estado de São Paulo et du bassin du Rio Parana, Brésil.
Papéis Avulsos de Zoologia, 52(37), 2012