title: Review of the species of the genus Serrapinnus Malabarba, 1998 (Teleostei: Characidae: Cheirodontinae) from the rio Tocantins-Araguaia basin, with description of three new species.
abstract: Species of the genus Serrapinnus from the rio Tocantins-Araguaia basin are revised and three new species are described. Serrapinnus aster new species is diagnosed by the presence of scimitar-shaped ventral procurrent caudal-fin rays of mature males forming a semicircle and by the presence of 7-9 cusps on the premaxillary teeth; S. lucindai new species is distinguished from its congeners by the presence of a higher number of ventral procurrent caudal-fin rays (17 to 19); and S. tocantinensis new species differs from the remaining species of the genus by the elongation of the unbranched dorsal and pelvic-fin rays into filaments in mature males. Serrapinnus sterbai is recognized as broadly distributed in the Tocantins-Araguaia basin and is redescribed based on specimens from across its entire distribution. A key for the cheirodontines occurring in the Atlantic drainages of northeastern Brazil, from the rio Tocantins-Araguaia to the rio Paraguaçú is provided.
authors.affiliation: Departamento de Zoologia, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500. 91501-970 Porto Alegre, RS, Brazil.; Email: malabarb@ufrgs.br.
authors.forename: Luiz R
authors.initials: LR
authors.lastname: Malabarba
authors.affiliation: Universidade Estadual de Londrina, Programa de Pós-Graduação em Ciências Biológicas, Departamento de Biologia Animal e Vegetal, Centro de Ciências Biológicas, 86057-970 Londrina, PR, Brazil.; Email: fjerep@gmail.com.
authors.forename: Fernando C
authors.initials: FC
authors.lastname: Jerep
mesh_terms: D058500:Animal Fins / Q000033:anatomy & histology; D000818:Animals; D001938:Brazil; D060126:Characidae / Q000033:anatomy & histology* / Q000145:classification*; D005260:Female; D008297:Male; D013045:Species Specificity; D014070:Tooth / Q000033:anatomy & histology