The ontogenetic transformation of the mesosaurid tarsus: a contribution to the origin of the primitive amniotic astragalus
The hypotheses about the origin of the primitive amniotic tarsus are very speculative. Early studies argued that the origin of the astragalus, one of the largest proximal bones in the tarsus of basal amniotes, was produced by either the fusion of two, three, or even four of the original tarsal bones...
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| Үндсэн зохиолч: | |
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| Бусад зохиолчид: | , |
| Формат: | article |
| Хэл сонгох: | англи |
| Хэвлэсэн: |
2016
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| Нөхцлүүд: | |
| Онлайн хандалт: | https://hdl.handle.net/20.500.12008/22601 |
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Шошго байхгүй, Энэхүү баримтыг шошголох эхний хүн болох!
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| _version_ | 1868890242177564672 |
|---|---|
| author | Piñeiro Martínez, Graciela H. |
| author2 | Núñez Demarco, Pablo Andrés Meneghel Morena, Melitta D. |
| author2_role | author author |
| author_browse | Meneghel Morena, Melitta D. Núñez Demarco, Pablo Andrés Piñeiro Martínez, Graciela H. |
| author_facet | Piñeiro Martínez, Graciela H. Núñez Demarco, Pablo Andrés Meneghel Morena, Melitta D. |
| author_role | author |
| collection | COLIBRI |
| dc.contributor.none.fl_str_mv | Piñeiro Martínez Graciela H., Universidad de la República (Uruguay). Facultad de Ciencias. Instituto de Ciencias Geológicas Núñez Demarco Pablo Andrés, Universidad de la República (Uruguay). Facultad de Ciencias. Instituto de Ciencias Geológicas Meneghel Morena Melitta D., Universidad de la República (Uruguay). Facultad de Ciencias. Instituto de Ecología y Ciencias Ambientales |
| dc.creator.none.fl_str_mv | Piñeiro Martínez, Graciela H. Núñez Demarco, Pablo Andrés Meneghel Morena, Melitta D. |
| dc.date.none.fl_str_mv | 2016 2019-11-29T15:39:29Z 2019-11-29T15:39:29Z |
| dc.format.none.fl_str_mv | 36 h. application/pdf |
| dc.identifier.none.fl_str_mv | Piñeiro, G., Núñez, P., Meneghel, M. "The ontogenetic transformation of the mesosaurid tarsus: a contribution to the origin of the primitive amniotic astragalus". PeerJ [en línea]. 2016 (4 ), e2036. doi: 10.7717/peerj.2036 2167-8359 https://hdl.handle.net/20.500.12008/22601 10.7717/peerj.2036 |
| dc.language.none.fl_str_mv | en eng |
| dc.publisher.none.fl_str_mv | PeerJ Inc |
| dc.relation.none.fl_str_mv | PeerJ, 2016, (4 ), e2036 |
| dc.rights.none.fl_str_mv | info:eu-repo/semantics/openAccess Licencia Creative Commons Atribución (CC - By 4.0) |
| dc.source.none.fl_str_mv | reponame:COLIBRI instname:Universidad de la República instacron:Universidad de la República |
| dc.subject.none.fl_str_mv | Mesosaur ontogeny Astragalus formation Evolutionary studies Navicular origin Implicated groups Amniotes Non Amniotes |
| dc.title.none.fl_str_mv | The ontogenetic transformation of the mesosaurid tarsus: a contribution to the origin of the primitive amniotic astragalus |
| dc.type.none.fl_str_mv | Artículo info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
| description | The hypotheses about the origin of the primitive amniotic tarsus are very speculative. Early studies argued that the origin of the astragalus, one of the largest proximal bones in the tarsus of basal amniotes, was produced by either the fusion of two, three, or even four of the original tarsal bones, the intermedium, the tibiale and the proximal centralia (c4 and c3), or that the intermedium alone transforms into the primitive astragalus. More recent studies have shown that the structure of the tarsus in Captorhinus supports the former hypothesis about a fusion of the intermedium, the tibiale, the proximal centrale (c4) and eventually c3, producing a purportedly multipartite structure of the amniotic astragalus, but the issue remained contentious. Very well preserved tarsi of the Early Permian aquatic amniote Mesosaurus tenuidens Gervais, 1864 1865, which represent the most complete ontogenetic succession known for a basal amniote (the other exceptional one is provided by the Late Permian diapsid Hovasaurus boulei Piveteau, 1926), suggest that there is more than one ossification center for the astragalus and that these fuse during late embryonic stages or maybe early after birth. A non-hatched Mesosaurus in an advanced stage of development shows that the tarsus is represented by a single bone, most probably the astragalus, which seems to be formed by the suturing of three bones, here interpreted as being the intermedium, the tibiale, probably already integrated to the c4 in an earlier stage of the development, and the c3. An amniote-like tarsal structure is observed in very basal Carboniferous and Permian tetrapods such as Proterogyrinus, Gephyrostegus, the diadectids Diadectes and Orobates, some microsaurs like Tuditanus and Pantylus and possibly Westlothiana, taxa that were all considered as true amniotes in their original descriptions. Therefore, the structure of the amniotic tarsus, including the configuration of the proximal series formed by the astragalus and the calcaneum, typically a pair of enlarged bones, could have been established well before the first recognized amniote walked on Earth. Accordingly, the tarsus of these taxa does not constitute specialized convergences that appeared in unrelated groups, they might be instead, part of a transformation series that involves taxa closely related to the early amniotes as some hypotheses have suggested. |
| eu_rights_str_mv | openAccess |
| format | article |
| id | anni_f9d4efe5d0e1fccd70d0401e26f5f0ac |
| identifier_str_mv | Piñeiro, G., Núñez, P., Meneghel, M. "The ontogenetic transformation of the mesosaurid tarsus: a contribution to the origin of the primitive amniotic astragalus". PeerJ [en línea]. 2016 (4 ), e2036. doi: 10.7717/peerj.2036 2167-8359 10.7717/peerj.2036 |
| instacron_str | Universidad de la República |
| institution | Universidad de la República |
| instname_str | Universidad de la República |
| language | eng |
| language_invalid_str_mv | en |
| network_acronym_str | anni |
| network_name_str | oai-lr-anni |
| oai_identifier_str | oai:colibri.udelar.edu.uy:20.500.12008/22601 |
| publishDate | 2016 |
| publishDateSort | 2016 |
| publisher.none.fl_str_mv | PeerJ Inc |
| reponame_str | COLIBRI |
| repository.mail.fl_str_mv | |
| repository.name.fl_str_mv | |
| repository_id_str | |
| rights_invalid_str_mv | Licencia Creative Commons Atribución (CC - By 4.0) |
| spelling | The ontogenetic transformation of the mesosaurid tarsus: a contribution to the origin of the primitive amniotic astragalusPiñeiro Martínez, Graciela H.Núñez Demarco, Pablo AndrésMeneghel Morena, Melitta D.Mesosaur ontogenyAstragalus formationEvolutionary studiesNavicular originImplicated groupsAmniotesNon AmniotesThe hypotheses about the origin of the primitive amniotic tarsus are very speculative. Early studies argued that the origin of the astragalus, one of the largest proximal bones in the tarsus of basal amniotes, was produced by either the fusion of two, three, or even four of the original tarsal bones, the intermedium, the tibiale and the proximal centralia (c4 and c3), or that the intermedium alone transforms into the primitive astragalus. More recent studies have shown that the structure of the tarsus in Captorhinus supports the former hypothesis about a fusion of the intermedium, the tibiale, the proximal centrale (c4) and eventually c3, producing a purportedly multipartite structure of the amniotic astragalus, but the issue remained contentious. Very well preserved tarsi of the Early Permian aquatic amniote Mesosaurus tenuidens Gervais, 1864 1865, which represent the most complete ontogenetic succession known for a basal amniote (the other exceptional one is provided by the Late Permian diapsid Hovasaurus boulei Piveteau, 1926), suggest that there is more than one ossification center for the astragalus and that these fuse during late embryonic stages or maybe early after birth. A non-hatched Mesosaurus in an advanced stage of development shows that the tarsus is represented by a single bone, most probably the astragalus, which seems to be formed by the suturing of three bones, here interpreted as being the intermedium, the tibiale, probably already integrated to the c4 in an earlier stage of the development, and the c3. An amniote-like tarsal structure is observed in very basal Carboniferous and Permian tetrapods such as Proterogyrinus, Gephyrostegus, the diadectids Diadectes and Orobates, some microsaurs like Tuditanus and Pantylus and possibly Westlothiana, taxa that were all considered as true amniotes in their original descriptions. Therefore, the structure of the amniotic tarsus, including the configuration of the proximal series formed by the astragalus and the calcaneum, typically a pair of enlarged bones, could have been established well before the first recognized amniote walked on Earth. Accordingly, the tarsus of these taxa does not constitute specialized convergences that appeared in unrelated groups, they might be instead, part of a transformation series that involves taxa closely related to the early amniotes as some hypotheses have suggested.PeerJ IncPiñeiro Martínez Graciela H., Universidad de la República (Uruguay). Facultad de Ciencias. Instituto de Ciencias GeológicasNúñez Demarco Pablo Andrés, Universidad de la República (Uruguay). Facultad de Ciencias. Instituto de Ciencias GeológicasMeneghel Morena Melitta D., Universidad de la República (Uruguay). Facultad de Ciencias. Instituto de Ecología y Ciencias Ambientales2019-11-29T15:39:29Z2019-11-29T15:39:29Z2016Artículoinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersion36 h.application/pdfPiñeiro, G., Núñez, P., Meneghel, M. "The ontogenetic transformation of the mesosaurid tarsus: a contribution to the origin of the primitive amniotic astragalus". PeerJ [en línea]. 2016 (4 ), e2036. doi: 10.7717/peerj.20362167-8359https://hdl.handle.net/20.500.12008/2260110.7717/peerj.2036reponame:COLIBRIinstname:Universidad de la Repúblicainstacron:Universidad de la RepúblicaenengPeerJ, 2016, (4 ), e2036Las obras depositadas en el Repositorio se rigen por la Ordenanza de los Derechos de la Propiedad Intelectual de la Universidad de la República.(Res. Nº 91 de C.D.C. de 8/III/1994 – D.O. 7/IV/1994) y por la Ordenanza del Repositorio Abierto de la Universidad de la República (Res. Nº 16 de C.D.C. de 07/10/2014)info:eu-repo/semantics/openAccessLicencia Creative Commons Atribución (CC - By 4.0)oai:colibri.udelar.edu.uy:20.500.12008/226012026-04-14T10:09:23Z |
| spellingShingle | The ontogenetic transformation of the mesosaurid tarsus: a contribution to the origin of the primitive amniotic astragalus Piñeiro Martínez, Graciela H. Mesosaur ontogeny Astragalus formation Evolutionary studies Navicular origin Implicated groups Amniotes Non Amniotes |
| status_str | publishedVersion |
| title | The ontogenetic transformation of the mesosaurid tarsus: a contribution to the origin of the primitive amniotic astragalus |
| title_full | The ontogenetic transformation of the mesosaurid tarsus: a contribution to the origin of the primitive amniotic astragalus |
| title_fullStr | The ontogenetic transformation of the mesosaurid tarsus: a contribution to the origin of the primitive amniotic astragalus |
| title_full_unstemmed | The ontogenetic transformation of the mesosaurid tarsus: a contribution to the origin of the primitive amniotic astragalus |
| title_short | The ontogenetic transformation of the mesosaurid tarsus: a contribution to the origin of the primitive amniotic astragalus |
| title_sort | The ontogenetic transformation of the mesosaurid tarsus: a contribution to the origin of the primitive amniotic astragalus |
| topic | Mesosaur ontogeny Astragalus formation Evolutionary studies Navicular origin Implicated groups Amniotes Non Amniotes |
| url | https://hdl.handle.net/20.500.12008/22601 |