title: Two new species of cascudinhos of the genus Otothyropsis (Siluriformes: Hypoptopomatinae) from the rio Paraná basin, Brazil.
abstract: Otothyropsis polyodon, sp. n., and O. biamnicus, sp. n., two new species of loricariid catfishes are described from the rio Paraná basin. Otothyropsis biamnicus and O. polyodon differ from two other Otothyropsis by having a longer caudal peduncle, middle series of lateral plates complete and with higher number of plates, and the anterior margin of the mesethmoid not covered by median rostral plate ventrally. The new species differ from each other in that O. polyodon have a longer pectoral-fin spine and a greater number of premaxillary and dentary teeth. Otothyropsis polyodon was collected in the rio Verde, tributary to the upper rio Paraná basin, and O. biamnicus is found in both the rio Iguaçu and rio Tibagi basins. A key for the species of Otothyropsis is presented and their relationships and geographical distributions are discussed.
authors.affiliation: Laboratório de Sistemática de Vertebrados, Pontifícia Universidade Católica do Rio Grande do Sul, Av. ipiranga 6681, P. O. Box 1429, 90619-900 Porto Alegre, RS, Brazil. barbara.calegari@gmail.com
authors.forename: Bárbara B
authors.initials: BB
authors.lastname: Calegari
authors.forename: Pablo A
authors.initials: PA
authors.lastname: Lehmann
authors.forename: Roberto E
authors.initials: RE
authors.lastname: Reis
mesh_terms: D000818:Animals; D001938:Brazil; D002397:Catfishes / Q000033:anatomy & histology* / Q000145:classification* / Q000235:genetics; D003576:Electron Transport Complex IV / Q000235:genetics; D005260:Female; D029941:Fish Proteins / Q000235:genetics; D008297:Male; D008969:Molecular Sequence Data; D017422:Sequence Analysis, DNA; D013045:Species Specificity
chemical_list: D029941:Fish Proteins; D003576:Electron Transport Complex IV