2016
DOI: 10.1590/1982-0224-20160023
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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-rake… Show more

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Cited by 12 publications
(8 citation statements)
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“…Sharing of species and lineages between the Aripuanã and Guiana Shield rivers is not restricted to the serrasalmids, but has also been observed in cichlids of the genus Symphysodon 70 , 71 and loricariid catfishes 72 . Aside from the three potential lineages of Metynnis luna , there were few new lineages of silver dollars, likely reflecting the recent taxonomic work 22 and ongoing studies being carried out on the group (Ota, studies in progress).…”
Section: Discussionmentioning
confidence: 99%
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“…Sharing of species and lineages between the Aripuanã and Guiana Shield rivers is not restricted to the serrasalmids, but has also been observed in cichlids of the genus Symphysodon 70 , 71 and loricariid catfishes 72 . Aside from the three potential lineages of Metynnis luna , there were few new lineages of silver dollars, likely reflecting the recent taxonomic work 22 and ongoing studies being carried out on the group (Ota, studies in progress).…”
Section: Discussionmentioning
confidence: 99%
“…While the 38 species of piscivorous true piranhas of the genera Serrasalmus , Pygocentrus , Pygopristis and Pristobrycon can be easily diagnosed by their single row of sharp interlocking teeth, the remaining genera–a non-monophyletic group of 56 species commonly known as “pacus” (e.g. Myleus , Myloplus , Piaractus ) or “silver dollars” ( Metynnis )–possess two rows of molariform or incisiform premaxillary teeth 5 , 8 , 19 – 22 . Phylogenetic hypotheses based either on morphological 23 , 24 or molecular 25 , 26 characters have been published.…”
Section: Introductionmentioning
confidence: 99%
“…The taxonomy and systematics of Serrasalmidae have a long-checkered past “fraught with confusion and instability” (Nico et al, 2018:172). Recent morphological studies have helped distinguish and diagnose a variety of valid genera and species (e.g., Pereira and Castro, 2014; Andrade et al, 2016a; 2016b; 2016c; 2017; 2018; 2019b; Ota et al, 2016; Mateussi et al, 2018; Nico et al, 2018; Escobar et al, 2019). The current study provides robust molecular support for recognizing three major lineages of Serrasalmidae at the subfamilial rank: Colossominae (pacus common to lowland, white water habitats), Myleinae (pacus common to upland clear- and black water habitats), and Serrasalminae (Metynnis and piranhas, cosmopolitan).…”
Section: Discussionmentioning
confidence: 99%
“…According to Rapp Py‐Daniel & Fernandes (), fishes are particularly interesting and informative organisms in studies of sexual dimorphism due to many specializations found between the sexes. Characiformes is one of the largest components of the freshwater fish fauna world‐wide, spanning numerous examples of sexual dimorphism (Weitzman & Cobb, ; Vari, ; Weitzman & Palmer, ; Zanata & Vari, ; Menezes & Weitzman, ; Gama, ; Malabarba & Jerep, ; Zanata & Camelier, ; Ota et al, ). Such cases are particularly profuse in Characidae, the most diverse family of the order (Mirande, ; Oliveira et al, ).…”
Section: Introductionmentioning
confidence: 99%