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| Ota,Rafaela Priscila; Py-Daniel,Lúcia Helena Rapp; Jégu,Michel. |
| ABSTRACT A new Metynnis is described from the rio Negro in Brazil and Venezuela, and from black- or clearwater tributaries in Brazil including the rios Parauari, Uatumã, Trombetas, and Sucunduri (the latter belonging to the rio Madeira basin). The new species can be distinguished readily from all congeners by having a high concentration of dark chromatophores on the lateral line scales. It can be further distinguished by the combination of head length 24.3-27.5% of SL, 13-18 gill-rakers on upper limb and 16-24 gill-rakers on lower limb. The new species is most similar to and likely most closely related to Metynnis hypsauchen . These two species share a similar color pattern, body shape and sexual dimorphism of the anal fin. However, they differ in that M.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biogeography; Metynnis hypsauchen; Osteological description; Phylogeny; Taxonomy. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252016000400205 |
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| Santos,Geraldo Mendes dos; Jégu,Michel. |
| RESUMOComo parte dos estudos ambientais que foram desenvolvidos pelo INPA, de 1980 a 1986, em convênio com a ELETRONORTE, na área de influência da UHE Tucuruí. são redescritas e ilustradas 20 espécies da damília Anostomidae do baixo rio Tocantins, entre Cametá e Itupiranga, PA: Leporinus affins, L. tigrinus, L. desmotes, L. sp. 4, L. trifasciatus, L. friderici, L. sp. 1, L. sp. 2, L. sp. 3, L. granti, L. pachiycheilus, Laemolyta petiti, L. taeniata, Anostomoides laticeps, A. sp. 1, Anostomus ternetzi, Leporellus vittatus, Schizodon vittatus, Sartor tucuruiense e Abramites hypselenotus. Cinco espécies (Laemolyta petiti, Leporinus affinis, L. sp. 2, Anostomoides sp. 1 e Sartor tucuruiense) somente foram assiladas até agora para a bacia do Tocantins-Araguaia.... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 1989 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59671989000100159 |
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| Ortí,Guillermo; Sivasundar,Arjun; Dietz,Kelly; Jégu,Michel. |
| Previous studies based on DNA sequences of mitochondrial (mt) rRNA genes showed three main groups within the subfamily Serrasalminae: (1) a "pacu" clade of herbivores (Colossoma, Mylossoma, Piaractus); (2) the "Myleus" clade (Myleus, Mylesinus, Tometes, Ossubtus); and (3) the "piranha" clade (Serrasalmus, Pygocentrus, Pygopristis, Pristobrycon, Catoprion, Metynnis). The genus Acnodon was placed as the sister taxon of clade (2+3). However, poor resolution within each clade was obtained due to low levels of variation among rRNA gene sequences. Complete sequences of the hypervariable mtDNA control region for a total of 45 taxa, and additional sequences of 12S and 16S rRNA from a total of 74 taxa representing all genera in the family are now presented to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Piranhas; Pacus; D-loop; Phylogeny; Bayesian inference. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000200030 |
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| Andrade,Marcelo C.; Giarrizzo,Tommaso; Jégu,Michel. |
| A new species of Serrasalmidae, Tometes camunani, is described from the upper drainages of the rio Trombetas basin, Pará State, Brazil. The new species is distinguished from its congeners by having neurocranium with a slight concavity at the level of the frontal bone (vs. concavity absent, dorsal profile of neurocranium straight). It can be further distinguished from its congeners by having teeth with central cusp taller and acute (vs. central cusp shorter and with rounded edge in T. trilobatus), a terminal mouth (vs. upturned mouth in T. lebaili), and 12-26 prepelvic spines (vs. 0-9 in T. makue). The new species is strictly rheophilic like other species of Tometes, and occurs exclusively in the rapids of shield rivers, complex and fragile biotopes that... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Amazon basin; Herbivorous fishes; Rapids; Rheophily; Taxonomy. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000200297 |
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