The Experts below are selected from a list of 4296 Experts worldwide ranked by ideXlab platform
Claudio Oliveira - One of the best experts on this subject based on the ideXlab platform.
-
Protocheirodon, a new genus of Characidae (Teleostei: Characiformes) with the redescription of the poorly known Protocheirodon pi
Neotropical Ichthyology, 2020Co-Authors: Richard P Vari, Bruno F. Melo, Claudio OliveiraAbstract:Protocheirodon, a new genus of the Characidae, is proposed to include a species previously assigned to Leptagoniates . This action is supported by molecular and morphological phylogenetic hypotheses that place Protocheirodon pi as the sister group of the remaining tribes in the Cheirodontinae versus the traditional assignment of the species to the Aphyocharacinae. The phylogenetic position of Protocheirodon is recognized as a new tribe, the Protocheirodontini. Protocheirodon pi , originally described based on a small number of specimens from a single location in the rio Mamore basin in the southwestern Amazon, is redescribed on the basis of larger series of specimens from the western and central portions of the Amazon basin.
-
molecular phylogeny of planaltina bohlke Characidae stevardiinae and comments on the definition and geographic distribution of the genus with description of a new species
PLOS ONE, 2018Co-Authors: Gabriel De Carvalho Depra, Gleisy S. Avelino, Carla Simone Pavanelli, Weferson Junio Da Graca, Claudio OliveiraAbstract:A molecular phylogeny of Planaltina, including the three previously described species and an undescribed species, is presented. The monophyly of the genus, included in Diapomini, is strongly supported. Its sister group, the remaining Diapomini, includes only species without modified caudal-fin squamation in the present analysis (species of Diapoma with caudal organs were not sampled). Creagrutus is sister to Planaltina plus remaining Diapomini instead of Planaltina being sister to Creagrutus plus Diapomini, as a previous analysis had suggested. Species of Planaltina form two clades: P. britskii plus the new species, with low support (< 50%); and P. myersi plus P. glandipedis, with higher support. Planaltina is rediagnosed from all Characidae based on the morphology of the caudal organ, the absence of a humeral spot and the presence of a complete lateral line. Comments on the caudal-fin squamation of Diapoma and Lepidocharax burnsi, on the type-series of L. burnsi and on the geographic distribution of Planaltina and Lepidocharax species are provided. Finally, a formal description of the aforementioned new species and a novel identification key to Planaltina are presented.
-
Molecular phylogeny of the Neotropical fish genus Tetragonopterus (Teleostei: Characiformes: Characidae)
Molecular Phylogenetics and Evolution, 2015Co-Authors: Bruno F. Melo, Ricardo C. Benine, Gabriel S. C. Silva, Gleisy S. Avelino, Claudio OliveiraAbstract:Abstract Tetragonopterinae encompasses characid species of the genus Tetragonopterus , which are widely distributed throughout east of the Andes in South America. While taxonomy has recently clarified the species diversity and molecular evidence strongly supports the monophyly of Tetragonopterus , no interspecific relationship studies are currently available. Here we used a large molecular dataset composed of two mitochondrial and three nuclear loci containing an extensive taxon sampling within the family Characidae and included eleven species of Tetragonopterus to generate the first time-calibrated phylogeny for Tetragonopterinae. Our results support monophyly of the subfamily represented solely by Tetragonopterus and corroborate previous molecular hypothesis of close relationship with Exodon plus Roeboexodon and the subfamily Characinae . Internally, we found Moenkhausia georgiae as sister species to all remaining species followed by T. rarus , being both species endemic to the Guiana Shield drainages. Species-level relationships are first hypothesized and putative morphological apomorphies are discussed as support to monophyletic clades. Our time-calibrated phylogeny suggested an origin of the genus during the Late Oligocene–Early Miocene. We hypothesized that the Andean geological activity followed by transformations in the Amazonian hydrographic scenario during the Miocene may have promoted most of the lineage diversification within the Tetragonopterus .
-
taxonomic revision and molecular phylogeny of gymnocorymbus eigenmann 1908 teleostei characiformes Characidae
Zootaxa, 2015Co-Authors: Ricardo C. Benine, Bruno F. Melo, Ricardo M C Castro, Claudio OliveiraAbstract:Characidae, one of the most diverse families of Characiformes and one of the largest clades of fishes in the world, has a complex taxonomic background, with one issue being the placement of various genera, including Gymnocorymbus . Herein, we generate the first molecular phylogeny for the genus using three nuclear and two mitochondrial loci and review the systematics of Gymnocorymbus . This genus includes the black tetra, a well-known and popular species among aquarists. Molecular phylogeny strongly supports the monophyly of Gymnocorymbus , with this hypothesis corroborated by the presence of three morphological synapomorphies. Of the six previously known nominal species of Gymnocorymbus , three are considered valid herein: Gymnocorymbus bondi from the Rio Orinoco basin, Gymnocorymbus ternetzi from the Rio Paraguay basin, and Gymnocorymbus thayeri from the Corantijn and Amazon basin and rivers of northeastern Brazil. A fourth species, Gymnocorymbus flaviolimai sp. n., is described from the Rio Madeira, Amazon basin. Lectotypes are designated for G. ternetzi and G. thayeri . Our results support previous hypotheses of the alignment of Gymnocorymbus close to the subfamily Stethaprioninae and also support the sister relationship between G. ternetzi and G. thayeri , and of that clade as sister to G. bondi.
-
molecular phylogeny of moenkhausia Characidae inferred from mitochondrial and nuclear dna evidence
Journal of Zoological Systematics and Evolutionary Research, 2013Co-Authors: Tatiane C Mariguela, Ricardo C. Benine, Gleisy S. Avelino, Claudio OliveiraAbstract:Moenkhausia is one of the most speciose genera in Characidae, currently composed of 75 nominal species of small fishes distributed across South American hydrographic basins, primarily the Amazon and Guyanas. Despite the large number of described species, studies involving a substantial number of its species designed to better understand their relationships and putative monophyly are still lacking. In this study, we analysed a large number of species of Moenkhausia to test the monophyly of the genus based on the phylogenetic analysis of DNA sequences of two mitochondrial and three nuclear genes. The in-group included 29 species of Moenkhausia, and the out-group was composed of representatives of Characidae and other members of Characiformes. All species of Moenkhausia belong to the same clade (Clade C); however, they appear distributed in five monophyletic groups along with other different genera, which means that Moenkhausia is polyphyletic and indicates the necessity of an extensive revision of the group.
Manoela M. F. Marinho - One of the best experts on this subject based on the ideXlab platform.
-
New species of miniature fish from Marajó Island, Pará, Brazil, with comments on its relationships (Characiformes: Characidae)
Neotropical Ichthyology, 2020Co-Authors: Manoela M. F. Marinho, Douglas A. Bastos, Naércio A. MenezesAbstract:A new miniature species of the family Characidae from Marajo Island, Para State, Brazil is described and assigned to the genus Tyttobrycon. The new species can be distinguished from its congeners primarily by having multicuspid teeth on jaws, and additionally by having the combination of 5-7 premaxillary teeth, dorsal fin only with scattered melanophores and the presence of an adipose fin.
-
Cyanogaster noctivaga, a remarkable new genus and species of miniature fish from the Rio Negro, Amazon basin (Ostariophysi: Characidae)
Ichthyological Exploration of Freshwaters, 2020Co-Authors: George Mendes Taliaferro Mattox, Ralf Britz, Mônica Toledo-piza, Manoela M. F. MarinhoAbstract:Cyanogaster noctivaga, new genus, new species, is described from the Rio Negro, Brazil. It is a miniature fish of the Characidae belonging to the Stevardiinae based on the presence of ii + 8 dorsal-fin rays and four teeth in the inner premaxillary tooth series. The new taxon can be distinguished from all other members of the Stevardiinae by having the reduced number of i + 5 pelvic-fin rays and the presence of a single conical tooth in the outer premaxillary tooth series. Other non-exclusive diagnostic features of Cyanogaster within the Stevardiinae are the lack of maxillary teeth, the incomplete lateral line, transparency of the body and conspicuous blue abdominal region. Mature males have hooks on the pelvicand anal-fin rays. A detailed osteological description of the new genus and species is is presented with comments on its putative relationships.
-
on a remarkable sexual dimorphic trait in the characiformes related to the olfactory organ and description of a new miniature species of tyttobrycon gery characiformes Characidae
PLOS ONE, 2019Co-Authors: Manoela M. F. Marinho, Vitor Pimenta Abrahao, Murilo N L PastanaAbstract:Among the order Characiformes, secondary sexual dimorphism is commonly associated to the occurrence of bony hooks on fins, shape and length of the dorsal and anal fins, and sexual dichromatism. The analysis of a new miniature Characidae species of the genus Tyttobrycon, described herein, yielded to the discovery of a sexually dimorphic trait related to nostril aperture and number of olfactory lamellae. In this type of dimorphism, mature males present larger nostril aperture and higher number of olfactory lamella than females. A dimorphic olfactory organ is for the first time recorded and described for a member of the Characiformes. Gross morphology and development of brain and peripheral olfactory organ of Tyttobrycon sp. n. are described and compared to other species of Characidae. It is hypothesized that such dimorphic trait is related to male-male detection during cohort competition in small characids. The new species of Tyttobrycon is diagnosed from its congeners by the number of branched anal-fin rays (19–21) and the absence of a caudal-peduncle blotch. It occurs in a small tributary of Rio Madeira basin, near to the limit between Brazil and Bolivia, Acre State, Brazil.
-
A new species of Knodus Eigenmann (Characiformes: Characidae: Stevardiinae) with comments on nuptial tubercles and gill gland in characiform fishes
PLOS ONE, 2019Co-Authors: Naércio A. Menezes, Manoela M. F. MarinhoAbstract:Knodus nuptialis n. sp. is described from the Rio Curuá drainage, Rio Xingu basin, Brazil. It can be diagnosed from its congeners by having dentary teeth decreasing gradually in size posteriorly, outer premaxillary teeth row with five cusps, 12-15 branched anal-fin rays and a single humeral spot. The species presents notable sexual dimorphism consisting of densely concentrated nuptial tubercles on head, body, and fins, gill-gland, and bony hooks in the anal fin of mature males. It was found that these sexually dimorphic features are useful and functional in males of the new species only during the reproductive season and after this period, they become atrophied, and eventually disappear. The list of characiform species presenting breeding tubercles is updated and nine species and two genera of the Characidae, Deuterodon and Bryconacidnus, are for the first time reported to have breeding tubercles.
-
Moenkhausia lepidura (Kner, 1858) (Characiformes, Characidae): osteology and relationships
Biota Neotropica, 2018Co-Authors: Gustavo Darlim, Manoela M. F. MarinhoAbstract:Abstract Cladistic analysis of fishes are mostly based on osteological studies. Phylogenetic relationships within the family Characidae are poorly known in part due to the lack of anatomical studies of its members, including osteology. The present contribution aims to offer a detailed description of all bony complexes of Moenkhausia lepidura. Two remarkable morphological conditions present in the species are discussed: a bony lamella on the proximal portion of the ribs and a basal expansion of the gill rakers. A morphological survey of several species of Characidae along with available phylogenetic information of the family indicates the putative relationships of Moenkhausia lepidura with other small characids presenting bony lamella on ribs and a dark mark on the caudal fin.
Ricardo M C Castro - One of the best experts on this subject based on the ideXlab platform.
-
taxonomic revision and molecular phylogeny of gymnocorymbus eigenmann 1908 teleostei characiformes Characidae
Zootaxa, 2015Co-Authors: Ricardo C. Benine, Bruno F. Melo, Ricardo M C Castro, Claudio OliveiraAbstract:Characidae, one of the most diverse families of Characiformes and one of the largest clades of fishes in the world, has a complex taxonomic background, with one issue being the placement of various genera, including Gymnocorymbus . Herein, we generate the first molecular phylogeny for the genus using three nuclear and two mitochondrial loci and review the systematics of Gymnocorymbus . This genus includes the black tetra, a well-known and popular species among aquarists. Molecular phylogeny strongly supports the monophyly of Gymnocorymbus , with this hypothesis corroborated by the presence of three morphological synapomorphies. Of the six previously known nominal species of Gymnocorymbus , three are considered valid herein: Gymnocorymbus bondi from the Rio Orinoco basin, Gymnocorymbus ternetzi from the Rio Paraguay basin, and Gymnocorymbus thayeri from the Corantijn and Amazon basin and rivers of northeastern Brazil. A fourth species, Gymnocorymbus flaviolimai sp. n., is described from the Rio Madeira, Amazon basin. Lectotypes are designated for G. ternetzi and G. thayeri . Our results support previous hypotheses of the alignment of Gymnocorymbus close to the subfamily Stethaprioninae and also support the sister relationship between G. ternetzi and G. thayeri , and of that clade as sister to G. bondi.
-
phylogenetic relationships within the speciose family Characidae teleostei ostariophysi characiformes based on multilocus analysis and extensive ingroup sampling
BMC Evolutionary Biology, 2011Co-Authors: Claudio Oliveira, Ricardo C. Benine, Gleisy S. Avelino, Guillermo Orti, Tatiane C Mariguela, Richard P Vari, Ricardo M C CastroAbstract:Background With nearly 1,100 species, the fish family Characidae represents more than half of the species of Characiformes, and is a key component of Neotropical freshwater ecosystems. The composition, phylogeny, and classification of Characidae is currently uncertain, despite significant efforts based on analysis of morphological and molecular data. No consensus about the monophyly of this group or its position within the order Characiformes has been reached, challenged by the fact that many key studies to date have non-overlapping taxonomic representation and focus only on subsets of this diversity.
-
New Species of Astyanax (Ostariophysi: Characiformes: Characidae) from the Upper Rio Paraná System, Brazil
Copeia, 2007Co-Authors: Richard P Vari, Ricardo M C CastroAbstract:Abstract Astyanax bockmanni, a new species of characid, is widespread in streams in the upper Rio Parana system of central, southeastern, and southern Brazil. Samples of the species were identified by previous authors as A. eigenmanniorum, a species originally described from far southern Brazil. Astyanax bockmanni differs from A. eigenmanniorum and all congeners in the combination of morphometric, meristic, and pigmentary features and details of oral dentition. Uncertainties concerning the generic placement of Astyanax paranahybae are discussed, and it is proposed that the species is a member of a clade within the Characidae that does not include Astyanax. Astyanax bockmanni, uma nova especie de caracideo, e amplamente distribuida em riachos do Alto Rio Parana, nas regioes centro-oeste, sudeste e sul do Brasil. Amostras dessa especie foram previamente identificadas por diversos autores como A. eigenmanniorum, uma especie originalmente descrita do extremo sul do Brasil. Astyanax bockmanni difere de A. eige...
Luiz Antonio Carlos Bertollo - One of the best experts on this subject based on the ideXlab platform.
-
Comparative cytogenetics between three Characidae fish species from the São Francisco River basin
Caryologia, 2020Co-Authors: Peres Wellington Adriano Moreira, Luiz Antonio Carlos Bertollo, Orlando Moreira-filhoAbstract:Abstract Characidae is one of the predominant fish groups in the Neotropical region with approximately 30 highly diversified subfamilies, probably not representing a monophyletic group. Three Characidae species from the Sao Francisco River basin (Tres Marias, MG, Brazil) were analyzed: Hasemania nana with 2n=50 chromosomes (8m+42sm), Orthospinus franciscencis with 2n=50 chromosomes (22m+20sm+2st+6a) and Piabina argentea with 2n=52 chromosomes (8m+14sm+16st+14a), all the species showing no differences between male and female karyo-types. The heterochromatin was preferentially distributed in the centromeric region of the chromosomes and the Ag-NORs were located in only a single chromosome pair in the three species. The chromosomal data obtained may be useful for the taxonomy and phylogenetic studies in those fish groups.
-
Physical mapping of the 18S and 5S ribosomal genes in nine Characidae species (Teleostei, Characiformes)
Genetics and Molecular Biology, 2020Co-Authors: Wellington Adriano Moreira Peres, Luiz Antonio Carlos Bertollo, Orlando Moreira-filhoAbstract:Characidae is one of the largest fish families of the Neotropical region, and presenting a pronounced morphological variability, certainly does not constitute a monophyletic group. The cytogenetical data also show a large chromosomal variation and can provide important information for a better understanding of the relationships between the species of this group. 18S and 5S rDNA probes were used in the present study for the chromosomal mapping in different Characidae species from the São Francisco River (Astyanax lacustris, Astyanax scabripinnis, Hasemania nana, Piabina argentea, Orthospinus franciscensis, Serrapinnus heterodon, Serrapinnus piaba and Myleus micans) and Alto Paraná (Astyanax altiparanae) basins. Species with a single pair of chromosomes bearing the nucleolar organizing regions (NORs) were identified, as well as species with multiple NORs, up to a maximum of seven 18S rDNA sites. The number of 5S rDNA site was also not constant, varying from two to eight. The mapping of the ribosomal genes was useful for the characterization and differentiation of the analyzed species
-
Characterization of the constitutive heterochromatin of Astyanax sp. D [Characiformes: Characidae] from the Upper Iguacu River [PR]
Folia Biologica, 2008Co-Authors: Daniel Luis Zanella Kantek, Luiz Antonio Carlos Bertollo, Marta Margarete Cestari, Orlando Moreira-filhoAbstract:KANTEK D. L. Z., CESTARI M. M., BERTOLLO L. A. C., MOREIRA-FILHO O. 2009. Characterization of the constitutive heterochromatin of Astyanax sp. D (Characiformes: Characidae) from the Upper Iguacu River (PR). Folia biol. (Krakow) 57: 37-41. Chromosomal characterization of constitutive heterochromatin was performed in Astyanax sp. D, a species found in the Iguacu river, using C-banding, fluorescent in situ hybridization (FISH) of the repetitive DNA family As51, localization of the 18S rDNA sites and base-specific fluorochromes. The sites of the satellite DNA coincide with large heterochromatic blocks present in this species, namely CMA3and DAPI-. The many 18S rDNA sites are CMA3+. Similarity between the large heterochromatic blocks is suggested, as well as the identification of two types of heterochromatin, one related to the 18S rDNA domains and the other to the As51 regions.
-
an uncommon condition for a sex chromosome system in Characidae fish distribution and differentiation of the zz zw system in triportheus
Chromosome Research, 2001Co-Authors: Roberto Ferreira Artoni, Jose Das Neves Falcao, Orlando Moreirafilho, Luiz Antonio Carlos BertolloAbstract:Triportheus is a neotropical freshwater Characidae fish that has a well-differentiated ZZ/ZW sex chromosome system. The W chromosome of this genus contains a large amount of heterochromatin and is smaller than the Z chromosome. This contrasts with other ZW fish systems where the W chromosome is larger in size due to increased heterochromatin. All species of Triportheus that have been studied cytologically (about 50% of the known species for this genus, from some of the major South American hydrographic basins) share this sex chromosome system, indicating a probable synapomorphic condition not present in other genera of the large Characidae family. However, while the Z chromosome appears to be largely conserved, the W chromosome shows a differential evolution with morphological differentiations not only among species, but also among populations from the same hydrographic basin, and with some species presenting a greater homology between the W and the Z chromosomes than others.
-
A highly differentiated ZZ/ZW sex chromosome system in a Characidae fish, Triportheus guentheri
Cytogenetic and Genome Research, 1992Co-Authors: Luiz Antonio Carlos Bertollo, Z.i. CavallaroAbstract:Seventeen specimens of Triportheus guentheri , a fish of the family Characidae, were submitted to chromosomal analysis, with a highly differentiated heteromorphic ZW pair being detec
Guillermo Orti - One of the best experts on this subject based on the ideXlab platform.
-
molecular phylogeny of the subfamily stevardiinae gill 1858 characiformes Characidae classification and the evolution of reproductive traits
BMC Evolutionary Biology, 2015Co-Authors: Andrea T Thomaz, Dahiana Arcila, Guillermo Orti, Luiz Roberto MalabarbaAbstract:Background The subfamily Stevardiinae is a diverse and widely distributed clade of freshwater fishes from South and Central America, commonly known as “tetras” (Characidae). The group was named “clade A” when first proposed as a monophyletic unit of Characidae and later designated as a subfamily. Stevardiinae includes 48 genera and around 310 valid species with many species presenting inseminating reproductive strategy. No global hypothesis of relationships is available for this group and currently many genera are listed as incertae sedis or are suspected to be non-monophyletic.
-
composition and interrelationships of a large neotropical freshwater fish group the subfamily cheirodontinae characiformes Characidae a case study based on mitochondrial and nuclear dna sequences
Molecular Phylogenetics and Evolution, 2013Co-Authors: Tatiane C Mariguela, Gleisy S. Avelino, Guillermo Orti, Claudio OliveiraAbstract:Abstract Characidae is the most species-rich family of freshwater fishes in the order Characiformes, with more than 1000 valid species that correspond to approximately 55% of the order. Few hypotheses about the composition and internal relationships within this family are available and most fail to reach an agreement. Among Characidae, Cheirodontinae is an emblematic group that includes 18 genera (1 fossil) and approximately 60 described species distributed throughout the Neotropical region. The taxonomic and systematic history of Cheirodontinae is complex, and only two hypotheses about the internal relationships in this subfamily have been reported to date. In the present study, we test the composition and relationships of fishes assigned to Cheirodontinae based on a broad taxonomic sample that also includes some characid incertae sedis taxa that were previously considered to be part of Cheirodontinae. We present phylogenetic analyses of a large molecular dataset of mitochondrial and nuclear DNA sequences. Our results reject the monophyly of Cheirodontinae as previously conceived, as well as the tribes Cheirodontini and Compsurini, and the genera Cheirodon, Compsura, Leptagoniates, Macropsobrycon, Odontostilbe, and Serrapinnus. On the basis of these results we propose: (1) the exclusion of Amazonspinther and Spintherobolus from the subfamily Cheirodontinae since they are the sister-group of all remaining Characidae; (2) the removal of Macropsobrycon xinguensis of the genus Macropsobrycon; (3) the removal of Leptagoniates pi of the genus Leptagoniates; (4) the inclusion of Leptagoniates pi in the subfamily Cheirodontinae; (5) the removal of Cheirodon stenodon of the genus Cheirodon and its inclusion in the subfamily Cheirodontinae under a new genus name; (6) the need to revise the polyphyletic genera Compsura, Odontostilbe, and Serrapinnus; and (7) the division of Cheirodontinae in three newly defined monophyletic tribes: Cheirodontini, Compsurini, and Pseudocheirodontini. Our results suggest that our knowledge about the largest Neotropical fish family, Characidae, still is incipient.
-
phylogenetic relationships within the speciose family Characidae teleostei ostariophysi characiformes based on multilocus analysis and extensive ingroup sampling
BMC Evolutionary Biology, 2011Co-Authors: Claudio Oliveira, Ricardo C. Benine, Gleisy S. Avelino, Guillermo Orti, Tatiane C Mariguela, Richard P Vari, Ricardo M C CastroAbstract:Background With nearly 1,100 species, the fish family Characidae represents more than half of the species of Characiformes, and is a key component of Neotropical freshwater ecosystems. The composition, phylogeny, and classification of Characidae is currently uncertain, despite significant efforts based on analysis of morphological and molecular data. No consensus about the monophyly of this group or its position within the order Characiformes has been reached, challenged by the fact that many key studies to date have non-overlapping taxonomic representation and focus only on subsets of this diversity.