A new Xenacanthiformes shark (Chondrichthyes, Elasmobranchii) from the Late Paleozoic Rio do Rasto Formation (Paraná Basin), Southern Brazil
The Brazilian records on Xenacanthiformes include teeth and cephalic spines from the Parnaíba, Amazonas and Paraná basins. This work describes a new species of Xenacanthidae, collected in an outcrop of Serrinha Member of Rio do Rasto Formation (Wordian to Wuchiapingian), Paraná Basin, municipality o...
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| Format: | Article |
| Language: | English |
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Academia Brasileira de Ciências
2014-03-01
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| Series: | Anais da Academia Brasileira de Ciências |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100135&lng=en&tlng=en |
| _version_ | 1819094857782657024 |
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| author | VICTOR E. PAULIV ELISEU V. DIAS FERNANDO A. SEDOR ANA MARIA RIBEIRO |
| author_facet | VICTOR E. PAULIV ELISEU V. DIAS FERNANDO A. SEDOR ANA MARIA RIBEIRO |
| author_sort | VICTOR E. PAULIV |
| collection | DOAJ |
| description | The Brazilian records on Xenacanthiformes include teeth and cephalic spines from the Parnaíba, Amazonas and Paraná basins. This work describes a new species of Xenacanthidae, collected in an outcrop of Serrinha Member of Rio do Rasto Formation (Wordian to Wuchiapingian), Paraná Basin, municipality of Jacarezinho, State of Paraná. The teeth of the new species are two or three-cuspidated and the aboral surface show a smooth concavity and one rounded basal tubercle. The coronal surface presents one semi-spherical and subcircular coronal button, and also two lateral main cusps and one central (when present) with less than one fifth of the size of the lateral cusps in the labial portion. The lateral cusps are asymmetric or symmetric, rounded in transversal section, lanceolate in longitudinal section, devoid of lateral carinae and lateral serrations, and with few smooth cristae of enameloid. In optical microscope the teeth show a trabecular dentine (osteodentine) base, while the cusps are composed by orthodentine, and the pulp cavities are non-obliterated by trabecular dentine. The fossil assemblage in the same stratigraphical level and in the whole Rio do Rasto Formation indicates another freshwater record for xenacanthid sharks. |
| first_indexed | 2024-12-21T23:34:04Z |
| format | Article |
| id | doaj.art-6bbe383f2b224288a0370c7da04fcd75 |
| institution | Directory Open Access Journal |
| issn | 1678-2690 |
| language | English |
| last_indexed | 2024-12-21T23:34:04Z |
| publishDate | 2014-03-01 |
| publisher | Academia Brasileira de Ciências |
| record_format | Article |
| series | Anais da Academia Brasileira de Ciências |
| spelling | doaj.art-6bbe383f2b224288a0370c7da04fcd752022-12-21T18:46:25ZengAcademia Brasileira de CiênciasAnais da Academia Brasileira de Ciências1678-26902014-03-0186113514510.1590/0001-37652014107612S0001-37652014000100135A new Xenacanthiformes shark (Chondrichthyes, Elasmobranchii) from the Late Paleozoic Rio do Rasto Formation (Paraná Basin), Southern BrazilVICTOR E. PAULIVELISEU V. DIASFERNANDO A. SEDORANA MARIA RIBEIROThe Brazilian records on Xenacanthiformes include teeth and cephalic spines from the Parnaíba, Amazonas and Paraná basins. This work describes a new species of Xenacanthidae, collected in an outcrop of Serrinha Member of Rio do Rasto Formation (Wordian to Wuchiapingian), Paraná Basin, municipality of Jacarezinho, State of Paraná. The teeth of the new species are two or three-cuspidated and the aboral surface show a smooth concavity and one rounded basal tubercle. The coronal surface presents one semi-spherical and subcircular coronal button, and also two lateral main cusps and one central (when present) with less than one fifth of the size of the lateral cusps in the labial portion. The lateral cusps are asymmetric or symmetric, rounded in transversal section, lanceolate in longitudinal section, devoid of lateral carinae and lateral serrations, and with few smooth cristae of enameloid. In optical microscope the teeth show a trabecular dentine (osteodentine) base, while the cusps are composed by orthodentine, and the pulp cavities are non-obliterated by trabecular dentine. The fossil assemblage in the same stratigraphical level and in the whole Rio do Rasto Formation indicates another freshwater record for xenacanthid sharks.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100135&lng=en&tlng=enPermianoXenacanthimorphaXenacanthidaeXenacanthusdentes de tubarão |
| spellingShingle | VICTOR E. PAULIV ELISEU V. DIAS FERNANDO A. SEDOR ANA MARIA RIBEIRO A new Xenacanthiformes shark (Chondrichthyes, Elasmobranchii) from the Late Paleozoic Rio do Rasto Formation (Paraná Basin), Southern Brazil Anais da Academia Brasileira de Ciências Permiano Xenacanthimorpha Xenacanthidae Xenacanthus dentes de tubarão |
| title | A new Xenacanthiformes shark (Chondrichthyes, Elasmobranchii) from the Late Paleozoic Rio do Rasto Formation (Paraná Basin), Southern Brazil |
| title_full | A new Xenacanthiformes shark (Chondrichthyes, Elasmobranchii) from the Late Paleozoic Rio do Rasto Formation (Paraná Basin), Southern Brazil |
| title_fullStr | A new Xenacanthiformes shark (Chondrichthyes, Elasmobranchii) from the Late Paleozoic Rio do Rasto Formation (Paraná Basin), Southern Brazil |
| title_full_unstemmed | A new Xenacanthiformes shark (Chondrichthyes, Elasmobranchii) from the Late Paleozoic Rio do Rasto Formation (Paraná Basin), Southern Brazil |
| title_short | A new Xenacanthiformes shark (Chondrichthyes, Elasmobranchii) from the Late Paleozoic Rio do Rasto Formation (Paraná Basin), Southern Brazil |
| title_sort | new xenacanthiformes shark chondrichthyes elasmobranchii from the late paleozoic rio do rasto formation parana basin southern brazil |
| topic | Permiano Xenacanthimorpha Xenacanthidae Xenacanthus dentes de tubarão |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100135&lng=en&tlng=en |
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