title: Morphological and molecular evidence for two new species of Tetragonopterus (Characiformes: Characidae) from central Brazil.
abstract: The combination of morphological and molecular data of Tetragonopterus species collected in the Rio Araguaia basin allows the recognition of two undescribed species that are presented in this article. These species are distinguished from their congeners (Tetragonopterus anostomus, Tetragonopterus argenteus, Tetragonopterus carvalhoi, Tetragonopterus chalceus and Tetragonopterus rarus) by characters related to the number and morphology of the teeth, the numbers of gill rakers on the upper and lower limbs of the first gill arch, the number of predorsal scales and the overall colour pattern. In addition, the analysis of mitochondrial DNA sequences identified an accentuated genetic distance between these two new species and their congeners. A discussion of the phylogenetic relationships within Tetragonopterus is provided.
authors: Laboratório de Biologia e Genética de Peixes, Departamento de Morfologia, Instituto de Biociências, Universidade Estadual Paulista-UNESP, Rubião Jr., s/n, 18618-970 Botucatu, SP, Brazil.
authors: G S C
authors: GS
authors: Silva
authors: B F
authors: BF
authors: Melo
authors: C
authors: C
authors: Oliveira
authors: R C
authors: RC
authors: Benine
mesh_terms: D058500:Animal Fins / Q000033:anatomy & histology; D000818:Animals; D001938:Brazil; D060126:Characidae / Q000033:anatomy & histology* / Q000235:genetics*; D003710:Demography; D005260:Female; D049810:Genetic Speciation; D008297:Male; D008969:Molecular Sequence Data; D010860:Pigments, Biological; D045483:Rivers; D012737:Sex Factors; D013045:Species Specificity; D014070:Tooth / Q000033:anatomy & histology
chemical_list: D010860:Pigments, Biological