<b>Ontogeny of the cranial bones of the giant amazon river turtle <em>Podocnemis expansa</em> Schweigger, 1812 (Testudines, Podocnemididae)</b> - doi: 10.4025/actascibiolsci.v32i2.5777 <b>Ontogeny of the cranial bones of the giant amazon river turtle <em>Podocnemis expansa</em> Schweigger, 1812 (Testudines, Podocnemididae)</b> - doi: 10.4025/actascibiolsci.v32i2.5777
In order to determine the normal stages of formation in the sequence of ossification of the cranium of <em>Podocnemis expansa</em> in its various stages of development, embryos were collected starting on the 18<sup>th</sup> day of natural incubation and were subjected to bone...
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doaj-1f19c1f123d54de198110f423828a6062020-11-25T03:01:27ZengUniversidade Estadual de MaringáActa Scientiarum : Biological Sciences1679-92831807-863X2010-05-0132218118810.4025/actascibiolsci.v32i2.5777<b>Ontogeny of the cranial bones of the giant amazon river turtle <em>Podocnemis expansa</em> Schweigger, 1812 (Testudines, Podocnemididae)</b> - doi: 10.4025/actascibiolsci.v32i2.5777 <b>Ontogeny of the cranial bones of the giant amazon river turtle <em>Podocnemis expansa</em> Schweigger, 1812 (Testudines, Podocnemididae)</b> - doi: 10.4025/actascibiolsci.v32i2.5777Fabiano Campos LimaLucélia Gonçalves VieiraAndré Luiz Quagliatto SantosIn order to determine the normal stages of formation in the sequence of ossification of the cranium of <em>Podocnemis expansa</em> in its various stages of development, embryos were collected starting on the 18<sup>th</sup> day of natural incubation and were subjected to bone diaphanization and staining. In the neurocranium, the basisphenoid and basioccipital bones present ossification centers in stage 19, the supraoccipital and opisthotic in stage 20, the exoccipital in stage 21, and lastly the prooptic in stage 24. Dermatocranium: the squamosal, pterygoid and maxilla are the first elements to begin the ossification process, which occurs in stage 16. However, ossification centers begin to appear in stage 17 in most of these bone elements, i.e., the frontal, jugal, postorbital, parietal, premaxilla and prefrontal, followed by the palatine and quadratojugal in stage 19 and lastly by the vomer in stage 25. The quadrate bone of the splanchnocranium ossifies in stage 23. The mandible and hyoid apparatus, the dentary, coronoid and supra-angular, show ossification centers in stage 16 and the branchial horn I in stage 17. The sequence and synchronization of ossification in P. <em> expansa</em> show similarities as well as differences when compared with other species of Testudines.<br>In order to determine the normal stages of formation in the sequence of ossification of the cranium of <em>Podocnemis expansa</em> in its various stages of development, embryos were collected starting on the 18<sup>th</sup> day of natural incubation and were subjected to bone diaphanization and staining. In the neurocranium, the basisphenoid and basioccipital bones present ossification centers in stage 19, the supraoccipital and opisthotic in stage 20, the exoccipital in stage 21, and lastly the prooptic in stage 24. Dermatocranium: the squamosal, pterygoid and maxilla are the first elements to begin the ossification process, which occurs in stage 16. However, ossification centers begin to appear in stage 17 in most of these bone elements, i.e., the frontal, jugal, postorbital, parietal, premaxilla and prefrontal, followed by the palatine and quadratojugal in stage 19 and lastly by the vomer in stage 25. The quadrate bone of the splanchnocranium ossifies in stage 23. The mandible and hyoid apparatus, the dentary, coronoid and supra-angular, show ossification centers in stage 16 and the branchial horn I in stage 17. The sequence and synchronization of ossification in P. <em> expansa</em> show similarities as well as differences when compared with other species of Testudines.http://www.periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/5777ReptilesPodocnemididaealizarinossification |
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DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Fabiano Campos Lima Lucélia Gonçalves Vieira André Luiz Quagliatto Santos |
spellingShingle |
Fabiano Campos Lima Lucélia Gonçalves Vieira André Luiz Quagliatto Santos <b>Ontogeny of the cranial bones of the giant amazon river turtle <em>Podocnemis expansa</em> Schweigger, 1812 (Testudines, Podocnemididae)</b> - doi: 10.4025/actascibiolsci.v32i2.5777 <b>Ontogeny of the cranial bones of the giant amazon river turtle <em>Podocnemis expansa</em> Schweigger, 1812 (Testudines, Podocnemididae)</b> - doi: 10.4025/actascibiolsci.v32i2.5777 Acta Scientiarum : Biological Sciences Reptiles Podocnemididae alizarin ossification |
author_facet |
Fabiano Campos Lima Lucélia Gonçalves Vieira André Luiz Quagliatto Santos |
author_sort |
Fabiano Campos Lima |
title |
<b>Ontogeny of the cranial bones of the giant amazon river turtle <em>Podocnemis expansa</em> Schweigger, 1812 (Testudines, Podocnemididae)</b> - doi: 10.4025/actascibiolsci.v32i2.5777 <b>Ontogeny of the cranial bones of the giant amazon river turtle <em>Podocnemis expansa</em> Schweigger, 1812 (Testudines, Podocnemididae)</b> - doi: 10.4025/actascibiolsci.v32i2.5777 |
title_short |
<b>Ontogeny of the cranial bones of the giant amazon river turtle <em>Podocnemis expansa</em> Schweigger, 1812 (Testudines, Podocnemididae)</b> - doi: 10.4025/actascibiolsci.v32i2.5777 <b>Ontogeny of the cranial bones of the giant amazon river turtle <em>Podocnemis expansa</em> Schweigger, 1812 (Testudines, Podocnemididae)</b> - doi: 10.4025/actascibiolsci.v32i2.5777 |
title_full |
<b>Ontogeny of the cranial bones of the giant amazon river turtle <em>Podocnemis expansa</em> Schweigger, 1812 (Testudines, Podocnemididae)</b> - doi: 10.4025/actascibiolsci.v32i2.5777 <b>Ontogeny of the cranial bones of the giant amazon river turtle <em>Podocnemis expansa</em> Schweigger, 1812 (Testudines, Podocnemididae)</b> - doi: 10.4025/actascibiolsci.v32i2.5777 |
title_fullStr |
<b>Ontogeny of the cranial bones of the giant amazon river turtle <em>Podocnemis expansa</em> Schweigger, 1812 (Testudines, Podocnemididae)</b> - doi: 10.4025/actascibiolsci.v32i2.5777 <b>Ontogeny of the cranial bones of the giant amazon river turtle <em>Podocnemis expansa</em> Schweigger, 1812 (Testudines, Podocnemididae)</b> - doi: 10.4025/actascibiolsci.v32i2.5777 |
title_full_unstemmed |
<b>Ontogeny of the cranial bones of the giant amazon river turtle <em>Podocnemis expansa</em> Schweigger, 1812 (Testudines, Podocnemididae)</b> - doi: 10.4025/actascibiolsci.v32i2.5777 <b>Ontogeny of the cranial bones of the giant amazon river turtle <em>Podocnemis expansa</em> Schweigger, 1812 (Testudines, Podocnemididae)</b> - doi: 10.4025/actascibiolsci.v32i2.5777 |
title_sort |
<b>ontogeny of the cranial bones of the giant amazon river turtle <em>podocnemis expansa</em> schweigger, 1812 (testudines, podocnemididae)</b> - doi: 10.4025/actascibiolsci.v32i2.5777 <b>ontogeny of the cranial bones of the giant amazon river turtle <em>podocnemis expansa</em> schweigger, 1812 (testudines, podocnemididae)</b> - doi: 10.4025/actascibiolsci.v32i2.5777 |
publisher |
Universidade Estadual de Maringá |
series |
Acta Scientiarum : Biological Sciences |
issn |
1679-9283 1807-863X |
publishDate |
2010-05-01 |
description |
In order to determine the normal stages of formation in the sequence of ossification of the cranium of <em>Podocnemis expansa</em> in its various stages of development, embryos were collected starting on the 18<sup>th</sup> day of natural incubation and were subjected to bone diaphanization and staining. In the neurocranium, the basisphenoid and basioccipital bones present ossification centers in stage 19, the supraoccipital and opisthotic in stage 20, the exoccipital in stage 21, and lastly the prooptic in stage 24. Dermatocranium: the squamosal, pterygoid and maxilla are the first elements to begin the ossification process, which occurs in stage 16. However, ossification centers begin to appear in stage 17 in most of these bone elements, i.e., the frontal, jugal, postorbital, parietal, premaxilla and prefrontal, followed by the palatine and quadratojugal in stage 19 and lastly by the vomer in stage 25. The quadrate bone of the splanchnocranium ossifies in stage 23. The mandible and hyoid apparatus, the dentary, coronoid and supra-angular, show ossification centers in stage 16 and the branchial horn I in stage 17. The sequence and synchronization of ossification in P. <em> expansa</em> show similarities as well as differences when compared with other species of Testudines.<br>In order to determine the normal stages of formation in the sequence of ossification of the cranium of <em>Podocnemis expansa</em> in its various stages of development, embryos were collected starting on the 18<sup>th</sup> day of natural incubation and were subjected to bone diaphanization and staining. In the neurocranium, the basisphenoid and basioccipital bones present ossification centers in stage 19, the supraoccipital and opisthotic in stage 20, the exoccipital in stage 21, and lastly the prooptic in stage 24. Dermatocranium: the squamosal, pterygoid and maxilla are the first elements to begin the ossification process, which occurs in stage 16. However, ossification centers begin to appear in stage 17 in most of these bone elements, i.e., the frontal, jugal, postorbital, parietal, premaxilla and prefrontal, followed by the palatine and quadratojugal in stage 19 and lastly by the vomer in stage 25. The quadrate bone of the splanchnocranium ossifies in stage 23. The mandible and hyoid apparatus, the dentary, coronoid and supra-angular, show ossification centers in stage 16 and the branchial horn I in stage 17. The sequence and synchronization of ossification in P. <em> expansa</em> show similarities as well as differences when compared with other species of Testudines. |
topic |
Reptiles Podocnemididae alizarin ossification |
url |
http://www.periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/5777 |
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