title: Tometes kranponhah and Tometes ancylorhynchus (Characiformes: Serrasalmidae), two new phytophagous serrasalmids, and the first Tometes species described from the Brazilian Shield.
abstract: Two new species of Tometes from the Brazilian Shield rapids are described. Tometes kranponhah is endemic to the Xingu River basin, whereas Tometes ancylorhynchus occurs both in the Xingu and the Tocantins-Araguaia River basins. The two species are sympatric in the Xingu drainages and have many similarities in morphology and colouration. Major diagnostic differences are the dark pigmentation on the opercle of T. kranponhah and its distinct snout shape and arrangement of premaxillary teeth. In addition, T. kranponhah is a large fish that is abundant in the Xingu River, whereas T. ancylorhynchus is a medium-sized fish for which there are few records.
authors.affiliation: Universidade Federal do Pará, Laboratório de Biologia Pesqueira e Manejo dos Recursos Aquáticos, Av. Perimetral 2651, 66040-830, Belém, PA, Brazil.|Programa de Pós-Graduação em Ecologia Aquática e Pesca, Universidade Federal do Pará, Av. Augusto Corrêa 1, 66075-110, Belém, PA, Brazil.
authors.forename: M C
authors.initials: MC
authors.lastname: Andrade
authors.affiliation: Institut de Recherche pour le Développement, Biologie des Organismes et Ecosystèmes Aquatiques, Laboratoire d'Icthyologie, Muséum national d'Histoire naturelle, CP26, 43 rue Cuvier, 75231, Paris Cedex 05, France.
authors.forename: M
authors.initials: M
authors.lastname: Jégu
authors.affiliation: Universidade Federal do Pará, Laboratório de Biologia Pesqueira e Manejo dos Recursos Aquáticos, Av. Perimetral 2651, 66040-830, Belém, PA, Brazil.|Programa de Pós-Graduação em Ecologia Aquática e Pesca, Universidade Federal do Pará, Av. Augusto Corrêa 1, 66075-110, Belém, PA, Brazil.|Programa de Pós-Graduação em Biodiversidade e Conservação, Universidade Federal do Pará, Av. Cel. José Porfírio 2515, 68372-010, Altamira, PA, Brazil.
authors.forename: T
authors.initials: T
authors.lastname: Giarrizzo
mesh_terms: D063147:Animal Distribution; D000818:Animals; D049628:Body Size; D001938:Brazil; D060125:Characiformes / Q000033:anatomy & histology / Q000145:classification* / Q000502:physiology; D045483:Rivers; D013045:Species Specificity
keywords: Myleus; Tocantins; Xingu; new species; rheophilic fishes; taxonomy