Chromosomes of three freshwater stingrays (Rajiformes Potamotrygonidae) from the Rio Negro basin, Amazon, Brazil
Potamotrygonidae is the representative family of South American freshwater elasmobranchs. It is a monophyletic group containing 20 species grouped into three genera. Three species belonging to two genera of this family were collected from the middle Negro River, Amazonas, Brazil, and studied cytogen...
| Autor principal: | Valentim, Francisco Carlos Souza de |
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| Outros Autores: | Falcão, José das Neves, Porto, Jorge Ivan Rebelo, Feldberg, Eliana |
| Grau: | Artigo |
| Idioma: | English |
| Publicado em: |
Genetica
2020
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| Assuntos: | |
| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/18725 |
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oai:repositorio:1-18725 |
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oai:repositorio:1-18725 Chromosomes of three freshwater stingrays (Rajiformes Potamotrygonidae) from the Rio Negro basin, Amazon, Brazil Valentim, Francisco Carlos Souza de Falcão, José das Neves Porto, Jorge Ivan Rebelo Feldberg, Eliana Fresh Water Animals Brasil Chromosome Chromosome Nor Classification Diploidy Electric Fish Genetics Karyotyping Species Difference Animal Brasil Chromosomes Diploidy Fresh Water Karyotyping Nucleolus Organizer Region Skates (fish) Species Specificity Elasmobranchii Paratrygon Aiereba Potamotrygon Potamotrygon Motoro Potamotrygon Orbignyi Potamotrygonidae Rajiformes Potamotrygonidae is the representative family of South American freshwater elasmobranchs. It is a monophyletic group containing 20 species grouped into three genera. Three species belonging to two genera of this family were collected from the middle Negro River, Amazonas, Brazil, and studied cytogenetically: Paratrygon aiereba, Potamotrygon motoro and Potamotrygon orbignyi. Paratrygon aiereba presented 2n = 90 chromosomes and 4M+2SM+10ST+74A. Both species of Potamotrygon presented 2n = 66 chromosomes and differed in their chromosomal formulas: P. motoro had 18M+12SM+10ST+26A and P. orbignyi had 22M+10SM+8ST+26A. No sex heteromorphism was detected. The Fundamental Number (FN) was 106 for the three species. A system of multiple NORs was found in the three species, but with interspecific differences in terms of location and position of the active Ag-NORs sites. Paratrygon aiereba presented only four sites on the short arms of two chromosomal pairs, both in terminal regions. Potamotrygon motoro presented seven sites, on the long and short arms, all in terminal regions of non-homologous chromosomes; P. orbignyi presented eight sites on the long arms, all in terminal regions, of non-homologous chromosomes. The constitutive heterochromatin was in pericentromeric regions of all chromosomes, and no significant interspecific difference was found in relation to this marker. © 2006 Springer. 2020-06-15T22:02:44Z 2020-06-15T22:02:44Z 2006 Artigo https://repositorio.inpa.gov.br/handle/1/18725 10.1007/s10709-005-3816-y en Volume 128, Número 1-3, Pags. 33-39 Restrito Genetica |
| institution |
Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional |
| collection |
INPA-RI |
| language |
English |
| topic |
Fresh Water Animals Brasil Chromosome Chromosome Nor Classification Diploidy Electric Fish Genetics Karyotyping Species Difference Animal Brasil Chromosomes Diploidy Fresh Water Karyotyping Nucleolus Organizer Region Skates (fish) Species Specificity Elasmobranchii Paratrygon Aiereba Potamotrygon Potamotrygon Motoro Potamotrygon Orbignyi Potamotrygonidae Rajiformes |
| spellingShingle |
Fresh Water Animals Brasil Chromosome Chromosome Nor Classification Diploidy Electric Fish Genetics Karyotyping Species Difference Animal Brasil Chromosomes Diploidy Fresh Water Karyotyping Nucleolus Organizer Region Skates (fish) Species Specificity Elasmobranchii Paratrygon Aiereba Potamotrygon Potamotrygon Motoro Potamotrygon Orbignyi Potamotrygonidae Rajiformes Valentim, Francisco Carlos Souza de Chromosomes of three freshwater stingrays (Rajiformes Potamotrygonidae) from the Rio Negro basin, Amazon, Brazil |
| topic_facet |
Fresh Water Animals Brasil Chromosome Chromosome Nor Classification Diploidy Electric Fish Genetics Karyotyping Species Difference Animal Brasil Chromosomes Diploidy Fresh Water Karyotyping Nucleolus Organizer Region Skates (fish) Species Specificity Elasmobranchii Paratrygon Aiereba Potamotrygon Potamotrygon Motoro Potamotrygon Orbignyi Potamotrygonidae Rajiformes |
| description |
Potamotrygonidae is the representative family of South American freshwater elasmobranchs. It is a monophyletic group containing 20 species grouped into three genera. Three species belonging to two genera of this family were collected from the middle Negro River, Amazonas, Brazil, and studied cytogenetically: Paratrygon aiereba, Potamotrygon motoro and Potamotrygon orbignyi. Paratrygon aiereba presented 2n = 90 chromosomes and 4M+2SM+10ST+74A. Both species of Potamotrygon presented 2n = 66 chromosomes and differed in their chromosomal formulas: P. motoro had 18M+12SM+10ST+26A and P. orbignyi had 22M+10SM+8ST+26A. No sex heteromorphism was detected. The Fundamental Number (FN) was 106 for the three species. A system of multiple NORs was found in the three species, but with interspecific differences in terms of location and position of the active Ag-NORs sites. Paratrygon aiereba presented only four sites on the short arms of two chromosomal pairs, both in terminal regions. Potamotrygon motoro presented seven sites, on the long and short arms, all in terminal regions of non-homologous chromosomes; P. orbignyi presented eight sites on the long arms, all in terminal regions, of non-homologous chromosomes. The constitutive heterochromatin was in pericentromeric regions of all chromosomes, and no significant interspecific difference was found in relation to this marker. © 2006 Springer. |
| format |
Artigo |
| author |
Valentim, Francisco Carlos Souza de |
| author2 |
Falcão, José das Neves Porto, Jorge Ivan Rebelo Feldberg, Eliana |
| author2Str |
Falcão, José das Neves Porto, Jorge Ivan Rebelo Feldberg, Eliana |
| title |
Chromosomes of three freshwater stingrays (Rajiformes Potamotrygonidae) from the Rio Negro basin, Amazon, Brazil |
| title_short |
Chromosomes of three freshwater stingrays (Rajiformes Potamotrygonidae) from the Rio Negro basin, Amazon, Brazil |
| title_full |
Chromosomes of three freshwater stingrays (Rajiformes Potamotrygonidae) from the Rio Negro basin, Amazon, Brazil |
| title_fullStr |
Chromosomes of three freshwater stingrays (Rajiformes Potamotrygonidae) from the Rio Negro basin, Amazon, Brazil |
| title_full_unstemmed |
Chromosomes of three freshwater stingrays (Rajiformes Potamotrygonidae) from the Rio Negro basin, Amazon, Brazil |
| title_sort |
chromosomes of three freshwater stingrays (rajiformes potamotrygonidae) from the rio negro basin, amazon, brazil |
| publisher |
Genetica |
| publishDate |
2020 |
| url |
https://repositorio.inpa.gov.br/handle/1/18725 |
| _version_ |
1787144557307101184 |
| score |
11.755432 |