Journal
NEOTROPICAL ICHTHYOLOGY
Volume 11, Issue 1, Pages 33-44Publisher
SOC BRASILEIRA ICTIOLOGIA
DOI: 10.1590/S1679-62252013000100004
Keywords
Filamentous dorsal-fin; Hyphessobrycon elachys; Hyphessobrycon heliacus; Rio Tapajos basin; Rio Tocantins basin; Sexual dimorphism
Categories
Funding
- Office National des Forets Brasil (ONF Brasil)
- PSA Peugeot/Citroen as part of the Peugeot/ONF Carbon Sink project
- Pronex (FINEP)
- Pronex (CNPq) [proc. 601058/1997-2]
- All Catfishes Species Inventory [NSF DEB-0315663]
- Atiaia Energia S/A
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) [proc. 474788/2006-7, 502975/2005-9, proc. 350672/2011-3]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
- Fundacao Estadual de Amparo a Pesquisa do Estado do Espirito Santo (FAPES) [proc. 53132203/2011]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [proc. 07/02978-7]
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A new species of Hyphessobrycon, H. peugeoti, is described from the middle portions of the rio Juruena drainage, upper rio Tapajos basin, Mato Grosso State, Brazil. It can be distinguished from all congeners, with the exception of H. loweae and H. heliacus, by a filamentous elongation of the dorsal fin and the approximately straight margin of the anal fin in adult males. It can be distinguished from both H. loweae and H. heliacus by an overall red coloration in life (vs. a golden coloration in life in the latter). Additionally, it can be distinguished from H. heliacus by the lack of chevron-like dark markings along the midline (vs. presence of chevron-like dark-markings in H. heliacus), and from H. loweae by the presence of only five horizontal scale rows between the dorsal-fin origin and the lateral line (vs. 6-7 in H. loweae), and the higher number of branched anal-fin rays (21-24, modally 22, vs. 17-21, modally 20, in H. loweae). Additional meristic, morphometric, and distributional data are provided for Hyphessobrycon loweae, including its first record in the rio Araguaia/Tocantins basin. Comments on a putative monophyletic group including H. peugeoti, H. loweae, H. heliacus, H. elachys, and H. moniliger are presented.
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