Shell and long-bone histology, skeletochronology, and lifestyle of Araripemys barretoi (Testudines: Pleurodira), a side-necked turtle of the Lower Cretaceous from Brazil
Abstract In this study we provide a comprehensive investigation of the microanatomical and microstructural aspects of the carapace and limb bones of the Early Cretaceous side-necked turtle, Araripemys barretoi, from the Araripe Basin, Brazil. Inter-elemental histovariability reveals different second...
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Academia Brasileira de Ciências
2021-08-01
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| Series: | Anais da Academia Brasileira de Ciências |
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| author | MARIANA VALÉRIA A. SENA RENAN ALFREDO M. BANTIM ANTÔNIO A.F. SARAIVA JULIANA M. SAYÃO GUSTAVO R. OLIVEIRA |
| author_facet | MARIANA VALÉRIA A. SENA RENAN ALFREDO M. BANTIM ANTÔNIO A.F. SARAIVA JULIANA M. SAYÃO GUSTAVO R. OLIVEIRA |
| author_sort | MARIANA VALÉRIA A. SENA |
| collection | DOAJ |
| description | Abstract In this study we provide a comprehensive investigation of the microanatomical and microstructural aspects of the carapace and limb bones of the Early Cretaceous side-necked turtle, Araripemys barretoi, from the Araripe Basin, Brazil. Inter-elemental histovariability reveals different secondary remodelling of the skeletal elements within the same individual. The vascularisation is scarce and mainly longitudinal, also it ceases towards the bone surface, forming an avascular parallel-fibred bone with closely spaced LAGs. These traits indicate a late ontogenetic stage and a slow growth rate for one of the two A. barretoi specimens. The high cortical thickness of the costal plate suggests an increase of the shell stiffness. The elevated relative bone wall thickness of the ulna compared to other limb bones indicates a case of local pachyosteosclerosis, possibly to improve body stability in the aquatic environment. |
| format | Article |
| id | doaj-art-90d2ce7db3ff4749b3ad7067395360a4 |
| institution | DOAJ |
| issn | 1678-2690 |
| language | English |
| publishDate | 2021-08-01 |
| publisher | Academia Brasileira de Ciências |
| record_format | Article |
| series | Anais da Academia Brasileira de Ciências |
| spelling | doaj-art-90d2ce7db3ff4749b3ad7067395360a42025-08-20T03:11:10ZengAcademia Brasileira de CiênciasAnais da Academia Brasileira de Ciências1678-26902021-08-0193suppl 210.1590/0001-3765202120201606Shell and long-bone histology, skeletochronology, and lifestyle of Araripemys barretoi (Testudines: Pleurodira), a side-necked turtle of the Lower Cretaceous from BrazilMARIANA VALÉRIA A. SENAhttps://orcid.org/0000-0003-4708-999XRENAN ALFREDO M. BANTIMhttps://orcid.org/0000-0003-4576-0989ANTÔNIO A.F. SARAIVAhttps://orcid.org/0000-0003-0127-8912JULIANA M. SAYÃOhttps://orcid.org/0000-0002-3619-0323GUSTAVO R. OLIVEIRAhttps://orcid.org/0000-0002-9871-1235Abstract In this study we provide a comprehensive investigation of the microanatomical and microstructural aspects of the carapace and limb bones of the Early Cretaceous side-necked turtle, Araripemys barretoi, from the Araripe Basin, Brazil. Inter-elemental histovariability reveals different secondary remodelling of the skeletal elements within the same individual. The vascularisation is scarce and mainly longitudinal, also it ceases towards the bone surface, forming an avascular parallel-fibred bone with closely spaced LAGs. These traits indicate a late ontogenetic stage and a slow growth rate for one of the two A. barretoi specimens. The high cortical thickness of the costal plate suggests an increase of the shell stiffness. The elevated relative bone wall thickness of the ulna compared to other limb bones indicates a case of local pachyosteosclerosis, possibly to improve body stability in the aquatic environment.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652021000401213&tlng=enAraripe Basinbone histologyEarly Cretaceousshell histologyturtle |
| spellingShingle | MARIANA VALÉRIA A. SENA RENAN ALFREDO M. BANTIM ANTÔNIO A.F. SARAIVA JULIANA M. SAYÃO GUSTAVO R. OLIVEIRA Shell and long-bone histology, skeletochronology, and lifestyle of Araripemys barretoi (Testudines: Pleurodira), a side-necked turtle of the Lower Cretaceous from Brazil Anais da Academia Brasileira de Ciências Araripe Basin bone histology Early Cretaceous shell histology turtle |
| title | Shell and long-bone histology, skeletochronology, and lifestyle of Araripemys barretoi (Testudines: Pleurodira), a side-necked turtle of the Lower Cretaceous from Brazil |
| title_full | Shell and long-bone histology, skeletochronology, and lifestyle of Araripemys barretoi (Testudines: Pleurodira), a side-necked turtle of the Lower Cretaceous from Brazil |
| title_fullStr | Shell and long-bone histology, skeletochronology, and lifestyle of Araripemys barretoi (Testudines: Pleurodira), a side-necked turtle of the Lower Cretaceous from Brazil |
| title_full_unstemmed | Shell and long-bone histology, skeletochronology, and lifestyle of Araripemys barretoi (Testudines: Pleurodira), a side-necked turtle of the Lower Cretaceous from Brazil |
| title_short | Shell and long-bone histology, skeletochronology, and lifestyle of Araripemys barretoi (Testudines: Pleurodira), a side-necked turtle of the Lower Cretaceous from Brazil |
| title_sort | shell and long bone histology skeletochronology and lifestyle of araripemys barretoi testudines pleurodira a side necked turtle of the lower cretaceous from brazil |
| topic | Araripe Basin bone histology Early Cretaceous shell histology turtle |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652021000401213&tlng=en |
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