Revisão taxonômica das espécies de Hyphessobrycon Durbin do grupo rosacéo pingo-de-sangue (Ostariophysi; characiformes; Characidae): comentários sobre a biologia reprodutiva do grupo
The main objective of the present work was to revise taxonomically the species included in the bleeding-heart tetras group, Hyphessobrycon erythrostigma (Fowler, 1943), H. socolofi Weitzman, 1977 and H. pyrrhonotus Burgess, 1993, and redescribe the three species based on a larger number of specime...
| Autor principal: | Teixeira, Túlio Franco |
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| Grau: | Dissertação |
| Idioma: | por |
| Publicado em: |
Instituto Nacional de Pesquisas da Amazônia - INPA
2020
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https://repositorio.inpa.gov.br/handle/1/11314 http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4253516E3 |
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The main objective of the present work was to revise taxonomically the species included in the bleeding-heart tetras group, Hyphessobrycon erythrostigma (Fowler, 1943), H. socolofi Weitzman, 1977 and H. pyrrhonotus Burgess, 1993, and redescribe the three species based on a larger number of specimens, description of the sexual dimorphism, informations about the geographic distribution and morphologic variation, and about the reproductive biology of the three species. A total of 151 specimens of H. erythrostigma, 144 specimens of H. socolofi and 32 specimens of H. pyrrhonotus were examined. Based on morphometry, meristics, osteology and color pattern analysis of relatively large number of specimens, it was possible to recognize only three species of bleeding-heart tetras . The bleeding-heart tetras is diagnosed by the presence of a conspicuously bright red spot in the humeral region in the living specimens, presence of 6-14 maxillary teeth, 7-9 scales row above lateral line, 5-7 scales row below lateral line and 26-33 branched anal-fin rays. The characters that definitely diagnosed the three species inside the group, in this work, are: presence and distribution of bony hooks on fins of mature males, presence or absence of scales with cirra‟, body and fins color patterns, the extension of the white stripe on the anal fin, and the metapterygoid shape. Among the characters that better diagnose the three species in this study, the presence or absence of scales with cirros and the metapterygoid shape are new for these species. Among the diagnostic characters, the number of scales below lateral line, the number of vertebrae, the metapterygoid shape and the presence or absence of scales with cirros were related to sexual dimorphism. H. erythrostigma was found in Moronacocha lake in Amazonas river basin, Peru, in Baré and Ubim streams in Amanã lake, Japurá river basin and in Ressaca da Gata in lake Ayapuá, in Purus river basin. H. socolofi was found in island Tamaquaré and in Marauiá river in upper Negro river, in Padauari river, middle Negro river, in Ano Bom stream in Viruá Naciona Park, upper Branco river and in Agua Boa stream, down Branco river, and in Nhamundá river. The presence of H. pyrrhonotus in Ereré river was confirmed. Analysis of the gonads of some specimens of the three species indicated that the group performs fractional spawning as reproductive strategy. The main conclusions of the present work are that the three species of the bleeding-heart tetras‟ are valid and their area of occurrence is much larger than initially suggested. |