Osteology of a perinatal aristonectine (Plesiosauria; Elasmosauridae)
Abstract Perinatal specimens give valuable information about the first stages of vertebrate ontogeny. Here, the morphology and palaeohistology of an aristonectine perinatal specimen from Seymour Island (Isla Marambio), López de Bertodano Formation are analysed. The palaeohistological analysis shows...
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crcambridgeupr:10.1017/s0954102016000365 2024-04-28T08:03:26+00:00 Osteology of a perinatal aristonectine (Plesiosauria; Elasmosauridae) O’Gorman, José P. Talevi, Marianella Fernández, Marta S. 2016 http://dx.doi.org/10.1017/s0954102016000365 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102016000365 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 29, issue 1, page 61-72 ISSN 0954-1020 1365-2079 Geology Ecology, Evolution, Behavior and Systematics Oceanography journal-article 2016 crcambridgeupr https://doi.org/10.1017/s0954102016000365 2024-04-02T06:55:10Z Abstract Perinatal specimens give valuable information about the first stages of vertebrate ontogeny. Here, the morphology and palaeohistology of an aristonectine perinatal specimen from Seymour Island (Isla Marambio), López de Bertodano Formation are analysed. The palaeohistological analysis shows incomplete endochondral ossification (retention of a calcified cartilaginous core in the medullary region), predominance of primary bone tissue without secondary remodelling, lack of primary or secondary osteons and of growth marks in the cortical bone, and open vascular spaces not surrounded by a thin coat of lamellar bone tissue. General lines of morphological changes were inferred from comparing the fossil with an adult aristonectine specimen indicating i) a tendency of relatively high and broad posterior cervicals to decrease during ontogeny, ii) a decrease of relative size of the dorsolateral process and an increase of the glenoid ramus and iii) the existence of two separate stages in propodial growth divided into an initial elongation followed by a distal expansion. The presence of a perinatal specimen in the James Ross Archipelago indicates that the region was used as a breeding area by the aristonectines during the last part of the Cretaceous. Article in Journal/Newspaper Antarctic Science Ross Archipelago Seymour Island Cambridge University Press Antarctic Science 29 1 61 72 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
topic |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
spellingShingle |
Geology Ecology, Evolution, Behavior and Systematics Oceanography O’Gorman, José P. Talevi, Marianella Fernández, Marta S. Osteology of a perinatal aristonectine (Plesiosauria; Elasmosauridae) |
topic_facet |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Abstract Perinatal specimens give valuable information about the first stages of vertebrate ontogeny. Here, the morphology and palaeohistology of an aristonectine perinatal specimen from Seymour Island (Isla Marambio), López de Bertodano Formation are analysed. The palaeohistological analysis shows incomplete endochondral ossification (retention of a calcified cartilaginous core in the medullary region), predominance of primary bone tissue without secondary remodelling, lack of primary or secondary osteons and of growth marks in the cortical bone, and open vascular spaces not surrounded by a thin coat of lamellar bone tissue. General lines of morphological changes were inferred from comparing the fossil with an adult aristonectine specimen indicating i) a tendency of relatively high and broad posterior cervicals to decrease during ontogeny, ii) a decrease of relative size of the dorsolateral process and an increase of the glenoid ramus and iii) the existence of two separate stages in propodial growth divided into an initial elongation followed by a distal expansion. The presence of a perinatal specimen in the James Ross Archipelago indicates that the region was used as a breeding area by the aristonectines during the last part of the Cretaceous. |
format |
Article in Journal/Newspaper |
author |
O’Gorman, José P. Talevi, Marianella Fernández, Marta S. |
author_facet |
O’Gorman, José P. Talevi, Marianella Fernández, Marta S. |
author_sort |
O’Gorman, José P. |
title |
Osteology of a perinatal aristonectine (Plesiosauria; Elasmosauridae) |
title_short |
Osteology of a perinatal aristonectine (Plesiosauria; Elasmosauridae) |
title_full |
Osteology of a perinatal aristonectine (Plesiosauria; Elasmosauridae) |
title_fullStr |
Osteology of a perinatal aristonectine (Plesiosauria; Elasmosauridae) |
title_full_unstemmed |
Osteology of a perinatal aristonectine (Plesiosauria; Elasmosauridae) |
title_sort |
osteology of a perinatal aristonectine (plesiosauria; elasmosauridae) |
publisher |
Cambridge University Press (CUP) |
publishDate |
2016 |
url |
http://dx.doi.org/10.1017/s0954102016000365 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102016000365 |
genre |
Antarctic Science Ross Archipelago Seymour Island |
genre_facet |
Antarctic Science Ross Archipelago Seymour Island |
op_source |
Antarctic Science volume 29, issue 1, page 61-72 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102016000365 |
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Antarctic Science |
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29 |
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1 |
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61 |
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72 |
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1797574545592287232 |