Orientador: Francisco Langeani / Banca: Luiz Roberto Malabarba / Banca: Oscar Akio Shibatta / Abstract: A taxonomic revision of Hyphessobrycon boulengeri (Eigenmann, 1907) and H. reticulatus Ellis, 1911 populations is presented with the description of a new species. A total of 600 specimens from southeastern and south Brazil were examined, ranging from Espírito Santo to Rio Grande do Sul. Morphometric multivariate analysis, osteologic characters, and color pattern allowed to recognition of H. boulengeri as valid species, occurring in coastal drainages from Rio de Janeiro to Rio Grande do Sul, and upper Paraná, Iguaçu, and Uruguay rivers, and a new species was found from rio Doce and rio da Prata in Espírito Santo State. H. boulengeri is diagnosed by presenting a humeral spot vertically elongate and relatively rounded; a narrow midlateral dark stripe in flank, weakly joined to caudal-peduncle blotch; caudal peduncle spot usually diamond shaped, with rounded edges; body with reticulated pattern formed by cromatophores concentration on posterior margin of scales; a narrow stripe on anal fin base and bony hooks strongly curved and very conspicuous on anal fin of males larger than 32.1 mm. Hyphessobrycon sp1. n. differs from the majority of congeners by the following combination of characters: a rounded humeral spot, sometimes with diffuse vertical tips; caudal peduncule blotch slightly rounded, extending onto middle caudal fin rays in few specimens; midlateral dark stripe absent in flank; body scales with intense pigmentation on their margins, forming a reticulated pattern; narrow lateral stripe along anal fin base, and 3rd and 4th infraorbitals coossified. Furthermore Hyphessobrycon sp1. n. is separated from H. boulengeri by the absence of midlateral dark stripe on flank and the co-ossification of infraorbitals 3rd and 4th. A short comment about biogeographic distribution of species in coastal and continental drainages of southeast and south Brazil is made / Mestre

Orientador: Francisco Langeani / Banca: Luiz Roberto Malabarba / Banca: Oscar Akio Shibatta / Resumo: Bryconamericus iheringii (Boulenger, 1887) é amplamente distribuída na bacia do rio da Prata e Sistema da Laguna dos Patos. Entretanto, há evidências de que a população de Bryconamericus do Alto rio Paraná, anteriormente identificada como B.iheringii seja diferente de B. iheringii descrita do Sistema da Laguna dos Patos, localidade-tipo da espécie, pelo menos na altura do corpo. Neste trabalho foram analisadas populações atribuídas a B. iheringii usando dados morfométricos, merísticos e osteológicos. Populações de B. iheringii do Sistema da Laguna dos Patos, rios Uruguai e Iguaçu, apresentaram diferenças significativas com as populações do Alto rio Paraná em diversos caracteres incluindo a altura do corpo, mas principalmente no diâmetro do olho e na presença de ganchos ósseos nos ramos anteriores dos raios ramificados da nadadeira anal. A redescrição de B. iheringii é apresentada, bem como a descrição da nova espécie da bacia do Alto rio Paraná e ambas são diagnosticadas de outras espécies do rio da Prata, rio São Francisco, drenagens litorâneas brasileiras e Sistema da Laguna dos Patos / Abstract: Bryconamericus iheringii (Boulenger, 1887) is widespread in the La Plata river basin and Laguna dos Patos System. There is evidence however that Bryconamericus population from Upper rio Paraná basin previously identified as B. iheringii is different from B. iheringii described from Laguna dos Patos System, type-locality of the species, at least at the body depth. In this work we have analyzed the populations assigned to B. iheringii using morphometric, meristic and osteological data. Populations of B. iheringii from Laguna dos Patos System, Uruguay and Iguaçu rivers have presented significant differences with the population from Upper rio Paraná basin in several characters including body depth, but mainly in the eye diameter and in the presence of bony hooks on anterior branches of branched rays of anal fin. A redescription for B. iheringii is presented as well as a description of a new species from Upper rio Paraná basin and both are diagnosed from other congeneric species from La Plata river, rio São Francisco, Brazilian coastal drainages, and Laguna dos Patos System / Mestre

Made available in DSpace on 2014-06-11T19:22:56Z (GMT). No. of bitstreams: 0 Previous issue date: 2006-02-24Bitstream added on 2014-06-13T19:28:29Z : No. of bitstreams: 1 tatsumi_fl_me_sjrp.pdf: 3972558 bytes, checksum: a2b978228f7cd32fa1e1bf09d421770d (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Bryconamericus iheringii (Boulenger, 1887) é amplamente distribuída na bacia do rio da Prata e Sistema da Laguna dos Patos. Entretanto, há evidências de que a população de Bryconamericus do Alto rio Paraná, anteriormente identificada como B.iheringii seja diferente de B. iheringii descrita do Sistema da Laguna dos Patos, localidade-tipo da espécie, pelo menos na altura do corpo. Neste trabalho foram analisadas populações atribuídas a B. iheringii usando dados morfométricos, merísticos e osteológicos. Populações de B. iheringii do Sistema da Laguna dos Patos, rios Uruguai e Iguaçu, apresentaram diferenças significativas com as populações do Alto rio Paraná em diversos caracteres incluindo a altura do corpo, mas principalmente no diâmetro do olho e na presença de ganchos ósseos nos ramos anteriores dos raios ramificados da nadadeira anal. A redescrição de B. iheringii é apresentada, bem como a descrição da nova espécie da bacia do Alto rio Paraná e ambas são diagnosticadas de outras espécies do rio da Prata, rio São Francisco, drenagens litorâneas brasileiras e Sistema da Laguna dos Patos / Bryconamericus iheringii (Boulenger, 1887) is widespread in the La Plata river basin and Laguna dos Patos System. There is evidence however that Bryconamericus population from Upper rio Paraná basin previously identified as B. iheringii is different from B. iheringii described from Laguna dos Patos System, type-locality of the species, at least at the body depth. In this work we have analyzed the populations assigned to B. iheringii using morphometric, meristic and osteological data. Populations of B. iheringii from Laguna dos Patos System, Uruguay and Iguaçu rivers have presented significant differences with the population from Upper rio Paraná basin in several characters including body depth, but mainly in the eye diameter and in the presence of bony hooks on anterior branches of branched rays of anal fin. A redescription for B. iheringii is presented as well as a description of a new species from Upper rio Paraná basin and both are diagnosed from other congeneric species from La Plata river, rio São Francisco, Brazilian coastal drainages, and Laguna dos Patos System

Made available in DSpace on 2014-06-11T19:22:56Z (GMT). No. of bitstreams: 0 Previous issue date: 2006-02-24Bitstream added on 2014-06-13T19:08:31Z : No. of bitstreams: 1 carvalho_fr_me_sjrp.pdf: 938139 bytes, checksum: 92c2bda2d3dd60cb989194d2188a08f4 (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / A taxonomic revision of Hyphessobrycon boulengeri (Eigenmann, 1907) and H. reticulatus Ellis, 1911 populations is presented with the description of a new species. A total of 600 specimens from southeastern and south Brazil were examined, ranging from Espírito Santo to Rio Grande do Sul. Morphometric multivariate analysis, osteologic characters, and color pattern allowed to recognition of H. boulengeri as valid species, occurring in coastal drainages from Rio de Janeiro to Rio Grande do Sul, and upper Paraná, Iguaçu, and Uruguay rivers, and a new species was found from rio Doce and rio da Prata in Espírito Santo State. H. boulengeri is diagnosed by presenting a humeral spot vertically elongate and relatively rounded; a narrow midlateral dark stripe in flank, weakly joined to caudal-peduncle blotch; caudal peduncle spot usually diamond shaped, with rounded edges; body with reticulated pattern formed by cromatophores concentration on posterior margin of scales; a narrow stripe on anal fin base and bony hooks strongly curved and very conspicuous on anal fin of males larger than 32.1 mm. Hyphessobrycon sp1. n. differs from the majority of congeners by the following combination of characters: a rounded humeral spot, sometimes with diffuse vertical tips; caudal peduncule blotch slightly rounded, extending onto middle caudal fin rays in few specimens; midlateral dark stripe absent in flank; body scales with intense pigmentation on their margins, forming a reticulated pattern; narrow lateral stripe along anal fin base, and 3rd and 4th infraorbitals coossified. Furthermore Hyphessobrycon sp1. n. is separated from H. boulengeri by the absence of midlateral dark stripe on flank and the co-ossification of infraorbitals 3rd and 4th. A short comment about biogeographic distribution of species in coastal and continental drainages of southeast and south Brazil is made