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dc.contributor.author
Schwab, Julia A.
dc.contributor.author
Young, Mark T.
dc.contributor.author
Herrera, Laura Yanina
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dc.contributor.author
Witmer, Lawrence
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Walsh, Stig A.
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Katsamensis, Orestis
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Brusatte, Stephen L.
dc.date.available
2022-08-11T14:39:20Z
dc.date.issued
2021-06
dc.identifier.citation
Schwab, Julia A.; Young, Mark T.; Herrera, Laura Yanina; Witmer, Lawrence; Walsh, Stig A.; et al.; The braincase and inner ear of ‘Metriorhynchus’ cf. ‘M.’ brachyrhynchus–implications for aquatic sensory adaptations in crocodylomorphs; Society of Vertebrate Paleontology; Journal of Vertebrate Paleontology; 41; 1; 6-2021; 1-12
dc.identifier.issn
0272-4634
dc.identifier.uri
http://hdl.handle.net/11336/165185
dc.description.abstract
During their long evolutionary history crocodylomorphs achieved a great diversity of body sizes, ecomorphotypes and inferred feeding ecologies. One unique group of crocodylomorphs are the thalattosuchians, which lived during the Jurassic and Cretaceous (ca. 191–125 Ma). They transitioned from shallow marine species, like teleosauroids, into fully pelagic forms with paddle shaped limbs and a vertically orientated tail fluke, the metriorhynchids. The osteological adaptations that allowed metriorhynchids to live in the water are generally well understood, but less is known about their neurosensory and endocranial systems, such as the brain, inner ears, sinuses and cranial nerves and how they relate to their aquatic lifestyle. Based on micro-computed tomography (μCT) data and three-dimensional models, we here describe the braincase and endocranial anatomy of a fully marine metriorhynchid, ‘Metriorhynchus’ cf. ‘M.’ brachyrhynchus (NHMUK PV OR 32617). We found several neuroanatomical features that likely helped this species function in its marine environment. These include a unique flexure in the brain endocast not seen in other thalattosuchians. Other features that have previously been seen in thalattosuchians include enlarged cerebral hemispheres, a hypertrophied venous sinus system, enlarged internal carotid arteries and foramina, and closed/absent lateral pharyngotympanic foramina. The specimen also possesses a pelagic metriorhynchid bony labyrinth morphology, with a compact and dorsoventrally short shape, thick semicircular canals, an enlarged vestibule and potentially a short cochlear duct. A review of character distribution confirms that some of these features evolved at the base of Thalattosuchia in semiaquatic species, long before metriorhynchids became pelagic, suggesting that endocranial anatomy helped allow metriorhynchoids colonize the ocean realm.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Society of Vertebrate Paleontology
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dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
THALATTOSUCHIA
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ENDOCRANIAL ANATOMY
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BONY LABYRINTH
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SENSORY EVOLUTION
dc.subject.classification
Paleontología
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dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
The braincase and inner ear of ‘Metriorhynchus’ cf. ‘M.’ brachyrhynchus–implications for aquatic sensory adaptations in crocodylomorphs
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2022-08-03T18:12:55Z
dc.journal.volume
41
dc.journal.number
1
dc.journal.pagination
1-12
dc.journal.pais
Estados Unidos
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dc.journal.ciudad
Lawrence
dc.description.fil
Fil: Schwab, Julia A.. University of Edinburgh; Reino Unido
dc.description.fil
Fil: Young, Mark T.. University of Edinburgh; Reino Unido
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Fil: Herrera, Laura Yanina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Paleontología Vertebrados; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina
dc.description.fil
Fil: Witmer, Lawrence. Ohio University; Estados Unidos
dc.description.fil
Fil: Walsh, Stig A.. University of Southampton; Reino Unido
dc.description.fil
Fil: Katsamensis, Orestis. Faculty Of Engineering And Physical Sciences; Reino Unido
dc.description.fil
Fil: Brusatte, Stephen L.. University of Edinburgh; Reino Unido
dc.journal.title
Journal of Vertebrate Paleontology
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.tandfonline.com/doi/full/10.1080/02724634.2021.1912062
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.1080/02724634.2021.1912062
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