78 documents found, page 1 of 8
Cytogenetic and molecular characteristics of Potamotrygon motoro and Potamotryg...
Cruz,Vanessa Paes da; Nobile,Maria Ligia Oliveira; Paim,Fabilene Gomes; Adachi,Aisni Mayumi Correia de Lima; Ribeiro,Giovana da SilvaAbstract The chromosomes of two freshwater stingrays, Potamotrygon motoro and Potamotrygon sp., from the Amazon River basin in Brazil were investigated using integrated molecular (cytochrome c oxidase subunit 1) and cytogenetic analyses. Potamotrygon motoro presented intraspecific variation in the diploid number, with 2n=66 in the females and 2n=65 in the males, while Potamotrygon sp. had a karyotype with 66 ch...
Molecular cytogenetic analysis and the establishment of a cell culture in the f...
Soares,Letícia Batista; Paim,Fabilene Gomes; Ramos,Lucas Peres; Foresti,Fausto; Oliveira,ClaudioAbstract Hollandichthys is a fish genus of the family Characidae that was until recently considered to be monotypic, with cytogenetic, morphological, and molecular data being restricted to a few local populations. In the present study, the karyotype of a population of Hollandichthys multifasciatus was analyzed using classical and molecular cytogenetic approaches for the investigation of potential markers that c...
Meiotic self-pairing of the Psalidodon (Characiformes, Characidae) iso-B chromo...
Silva,Duílio Mazzoni Zerbinato de Andrade; Araya-Jaime,Cristian; Yamashita,Masakane; Vidal,Mateus Rossetto; Oliveira,Claudio; Porto-Foresti,FábioAbstract B chromosomes are non-essential additional genomic elements present in several animal and plant species. In fishes, species of the genus Psalidodon (Characiformes, Characidae) harbor great karyotype diversity, and multiple populations carry different types of non-essential B chromosomes. This study analyzed how the dispensable supernumerary B chromosome of Psalidodon paranae behaves during meiosis to o...
Chromosome analysis in Saccodon wagneri (Characiformes) and insights into the k...
Nirchio,Mauro; Masache,Maria Cecilia; Paim,Fabilene Gomes; Cioffi,Marcelo de Bello; Moreira Filho,Orlando; Barriga,Ramiro; Oliveira,ClaudioABSTRACT Parodontidae is a relatively small group of Neotropical characiform fishes consisting of three genera (Apareiodon, Parodon, and Saccodon) with 32 valid species. A vast cytogenetic literature is available on Apareiodon and Parodon, but to date, there is no cytogenetic data about Saccodon, a genus that contains only three species with a trans-Andean distribution. In the present study the karyotype of S. ...
A new Hyphessobrycon (Characiformes: Characidae) of the Hyphessobrycon heterorh...
Faria,Tiago C.; Guimarães,Karen L. A.; Rodrigues,Luís R. R.; Oliveira,Claudio; Lima,Flávio C.T.ABSTRACT A new species of Hyphessobrycon belonging to the Hyphessobrycon heterorhabdus species-group from the lower rio Tapajós, state of Pará, Brazil, is described. The new species is allocated into the Hyphessobrycon heterorhabdus species-group due to its color pattern, composed by an anteriorly well-defined, horizontally elongated humeral blotch that becomes diffuse and blurred posteriorly, where it overlaps...
Cytomolecular investigations using repetitive DNA probes contribute to the iden...
Oliveira,Maria Lígia Marques de; Paim,Fabilene Gomes; Freitas,Érica Alves Serrano de; Oliveira,Claudio; Foresti,FaustoAbstract Characidium sp. aff. C. vidali is a species found in coastal streams in southeastern Brazil, which has karyotypic explanatory elements as the occurrence of microstructural variations, keeping the chromosomal macrostructure of the genus. The objective of this study was to apply cytomolecular tools in the chromosomes of Characidium sp. aff. C. vidali to identify characteristics in their karyotype contrib...
Genetic diversity in two threatened species of guitarfish (Elasmobranchii: Rhin...
Cruz,Vanessa P.; Adachi,Aisni M.C. L.; Oliveira,Pablo H.; Ribeiro,Giovana S.; Paim,Fabilene G.; Souza,Bruno C.; Rodrigues,Alexandre S.F.; Vianna,MarceloAbstract The guitarfishes Pseudobatos horkelii and Pseudobatos percellens meet the criteria for threatened status as Critically Endangered (CR) and Endangered (EN), respectively. Both species occur in the Southern Atlantic Ocean. Considering the lack of data on the genetic structure of these species, the present study evaluated the genetic variability and population structure of the P. horkelii and P. percellen...
Molecular identification of Brachygenys and Haemulon species (Perciformes: Haem...
Cerqueira,Najila Nolie Catarine Dantas; Rotundo,Matheus Marcos; Marceniuk,Alexandre Pires; Cruz,Vanessa Paes da; Foresti,Fausto; Oliveira,ClaudioAbstract The fishes of the Haemulidae family are currently allocated to 19 genera with a worldwide distribution in the tropical and subtropical waters of the world’s oceans. Brachygenys and Haemulon are important genera of reef fish in Brazil, as they occur in large shoals, which are both ecologically and commercially valuable. This study identified the Brazilian species of the genera Brachygenys and Haemulon u...
A new miniature species of Priocharax (Characiformes: Characidae) from the uppe...
Mattox,George Mendes Taliaferro; Souza,Camila da Silva de; Toledo-Piza,Mônica; Oliveira,ClaudioAbstract A new species of miniature fish of the characid genus Priocharax is described from a small lake near the rio Ipixuna, rio Purus drainage, Amazonas State, Brazil. It is distinguished from all congeners except P. pygmaeus by the lower number of teeth on the maxilla and dentary. It differs from P. pygmaeus by the presence of two postcleithra and 22–27 branched anal-fin rays (vs absence and 19–22). The new...
Molecular species delimitation of the genera Anodus, Argonectes, Bivibranchia a...
Nogueira,Acácio Freitas; Oliveira,Claudio; Langeani,Francisco; Netto-Ferreira,Andre LuizABSTRACT A good taxonomic assessment of specimens is an essential task to many biological studies and DNA data have provided additional sources of information to assist in the disentanglement of taxonomic problems among living organisms, as has been the case of some taxa of the megadiverse Neotropical ichthyofauna. Here we assessed all valid species in the Neotropical freshwater fish genera Anodus, Argonectes, ...