التفاصيل البيبلوغرافية
| العنوان: |
Thalattosuchian crocodylomorphs from the Sinemurian (Early Jurassic) of the UK. |
| المؤلفون: |
Young, Mark T, Dufeau, David, Bowman, Charlotte, Cowgill, Thomas, Schwab, Julia A, Witmer, Lawrence M, Herrera, Yanina, Katsamenis, Orestis L, Steel, Lorna, Rigby, Martin, Brusatte, Stephen L |
| المصدر: |
Zoological Journal of the Linnean Society; Jul2024, Vol. 201 Issue 3, p1-35, 35p |
| مصطلحات موضوعية: |
PARANASAL sinuses, THORACIC vertebrae, CERVICAL vertebrae, CANCELLOUS bone, BEAKS |
| مستخلص: |
Thalattosuchian crocodylomorphs were a ubiquitous component of shallow marine ecosystems during the Jurassic and Early Cretaceous. Alas, their origins remain a mystery. Here we describe three specimens from the Sinemurian (and possibly Early Pliensbachian) of the UK: a partial cranial rostrum, a series of cervical vertebrae, and two dorsal vertebrae adhered with matrix. These specimens are amongst the oldest known thalattosuchian fossils, with the partial cranial rostrum being the oldest known non-neothalattosuchian thalattosuchian. This partial cranial rostrum has a unique combination of rostral characters never seen before in any crocodylomorph, and helps to elucidate early thalattosuchian internal rostrum evolution, suggesting that the reduction in thalattosuchian paranasal sinuses was not related to either the reorganization of rostral neurovasculature seen in later diverging taxa or the increased cancellous bone microstructure. Based on our CT sample, a shift in cranial bone microstructure occurred in the Eoneustes + Metriorhynchidae subclade, one that coincided with the enlargement of the salt glands and decoupling of the external antorbital fenestra from the paranasal sinuses. Without extensive histological sampling we cannot determine whether the shift to an obligate aquatic lifestyle occurred prior to the evolution of Metriorhynchidae. [ABSTRACT FROM AUTHOR] |
|
Copyright of Zoological Journal of the Linnean Society is the property of Oxford University Press / USA and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
| قاعدة البيانات: |
Complementary Index |
