The internal braincase anatomy of Thalattosuchus superciliosus – with implications for the endocranial evolution of metriorhynchid crocodylomorphs
- Autores
- Higgins, Robert R.; Cowgill, Thomas; Young, Mark T.; Schwab, Julia A.; Herrera, Laura Yanina; Witmer, Lawrence; Katsamenis, Orestis L.; Bowman, Charlotte; Brusatte, Stephen L.
- Año de publicación
- 2024
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- Thalattosuchian crocodylomorphs underwent a major evolutionary transition, evolving from semiaquatic forms reminiscent of extant crocodylians, into pelagic marine forms with flippers, a tail fin and smooth scaleless skin. These fully aquatic forms – the Metriorhynchidae – evolved a novel suite of endocranial anatomies hypothesised to be related to living in saltwater. However, much remains to be discovered about the evolution of these internal braincase structures. Herein, we describe the endocranial anatomy of an early diverging metriorhynchid, Thalattosuchus superciliosus, using microfocus computed tomography (μCT) data and three-dimensional modelling. We compared it against geosaurine and metriorhynchine metriorhynchids, as well as the early diverging metriorhynchoid Pelagosaurus. We found that non-geosaurine metriorhynchids differ from geosaurines in having less laterally expanded cerebral hemispheres, shallowercurvatures of the brain’s dorsal margin, and lacking the ventral deflection of the pneumatic diverticulum ventral to the pituitary fossa chamber. However, early-diverging metriorhynchids have well-defined otoccipital diverticula and lacked the ‘extreme pelagic’ endosseous labyrinth morphology. We hypothesise that early metriorhynchids were not adapted to a sustained pursuit lifestyle. Moreover, we posit that within both metriorhynchid subfamilies there was parallel evolution towards becoming pursuit predators.
Fil: Higgins, Robert R.. University of Edinburgh; Reino Unido
Fil: Cowgill, Thomas. University of Edinburgh; Reino Unido
Fil: Young, Mark T.. University of Edinburgh; Reino Unido
Fil: Schwab, Julia A.. University of Edinburgh; Reino Unido
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
Fil: Witmer, Lawrence. Ohio University; Estados Unidos
Fil: Katsamenis, Orestis L.. University of Southampton; Reino Unido
Fil: Bowman, Charlotte. University of Edinburgh; Reino Unido
Fil: Brusatte, Stephen L.. University of Edinburgh; Reino Unido - Materia
-
CROCODYLOMORPHA
ENDOCRANIAL ANATOMY
METRIORHYNCHIDAE
THALATTOSUCHIA
THALATTOSUCHUS SUPERCILIOSUS - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/256334
Ver los metadatos del registro completo
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The internal braincase anatomy of Thalattosuchus superciliosus – with implications for the endocranial evolution of metriorhynchid crocodylomorphsHiggins, Robert R.Cowgill, ThomasYoung, Mark T.Schwab, Julia A.Herrera, Laura YaninaWitmer, LawrenceKatsamenis, Orestis L.Bowman, CharlotteBrusatte, Stephen L.CROCODYLOMORPHAENDOCRANIAL ANATOMYMETRIORHYNCHIDAETHALATTOSUCHIATHALATTOSUCHUS SUPERCILIOSUShttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Thalattosuchian crocodylomorphs underwent a major evolutionary transition, evolving from semiaquatic forms reminiscent of extant crocodylians, into pelagic marine forms with flippers, a tail fin and smooth scaleless skin. These fully aquatic forms – the Metriorhynchidae – evolved a novel suite of endocranial anatomies hypothesised to be related to living in saltwater. However, much remains to be discovered about the evolution of these internal braincase structures. Herein, we describe the endocranial anatomy of an early diverging metriorhynchid, Thalattosuchus superciliosus, using microfocus computed tomography (μCT) data and three-dimensional modelling. We compared it against geosaurine and metriorhynchine metriorhynchids, as well as the early diverging metriorhynchoid Pelagosaurus. We found that non-geosaurine metriorhynchids differ from geosaurines in having less laterally expanded cerebral hemispheres, shallowercurvatures of the brain’s dorsal margin, and lacking the ventral deflection of the pneumatic diverticulum ventral to the pituitary fossa chamber. However, early-diverging metriorhynchids have well-defined otoccipital diverticula and lacked the ‘extreme pelagic’ endosseous labyrinth morphology. We hypothesise that early metriorhynchids were not adapted to a sustained pursuit lifestyle. Moreover, we posit that within both metriorhynchid subfamilies there was parallel evolution towards becoming pursuit predators.Fil: Higgins, Robert R.. University of Edinburgh; Reino UnidoFil: Cowgill, Thomas. University of Edinburgh; Reino UnidoFil: Young, Mark T.. University of Edinburgh; Reino UnidoFil: Schwab, Julia A.. University of Edinburgh; Reino UnidoFil: 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; ArgentinaFil: Witmer, Lawrence. Ohio University; Estados UnidosFil: Katsamenis, Orestis L.. University of Southampton; Reino UnidoFil: Bowman, Charlotte. University of Edinburgh; Reino UnidoFil: Brusatte, Stephen L.. University of Edinburgh; Reino UnidoTaylor & Francis2024-11info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/256334Higgins, Robert R.; Cowgill, Thomas; Young, Mark T.; Schwab, Julia A.; Herrera, Laura Yanina; et al.; The internal braincase anatomy of Thalattosuchus superciliosus – with implications for the endocranial evolution of metriorhynchid crocodylomorphs; Taylor & Francis; Historical Biology; 2024; 11-2024; 1-120891-29631029-2381CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.tandfonline.com/doi/full/10.1080/08912963.2024.2427096info:eu-repo/semantics/altIdentifier/doi/10.1080/08912963.2024.2427096info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:30:12Zoai:ri.conicet.gov.ar:11336/256334instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:30:12.812CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
The internal braincase anatomy of Thalattosuchus superciliosus – with implications for the endocranial evolution of metriorhynchid crocodylomorphs |
title |
The internal braincase anatomy of Thalattosuchus superciliosus – with implications for the endocranial evolution of metriorhynchid crocodylomorphs |
spellingShingle |
The internal braincase anatomy of Thalattosuchus superciliosus – with implications for the endocranial evolution of metriorhynchid crocodylomorphs Higgins, Robert R. CROCODYLOMORPHA ENDOCRANIAL ANATOMY METRIORHYNCHIDAE THALATTOSUCHIA THALATTOSUCHUS SUPERCILIOSUS |
title_short |
The internal braincase anatomy of Thalattosuchus superciliosus – with implications for the endocranial evolution of metriorhynchid crocodylomorphs |
title_full |
The internal braincase anatomy of Thalattosuchus superciliosus – with implications for the endocranial evolution of metriorhynchid crocodylomorphs |
title_fullStr |
The internal braincase anatomy of Thalattosuchus superciliosus – with implications for the endocranial evolution of metriorhynchid crocodylomorphs |
title_full_unstemmed |
The internal braincase anatomy of Thalattosuchus superciliosus – with implications for the endocranial evolution of metriorhynchid crocodylomorphs |
title_sort |
The internal braincase anatomy of Thalattosuchus superciliosus – with implications for the endocranial evolution of metriorhynchid crocodylomorphs |
dc.creator.none.fl_str_mv |
Higgins, Robert R. Cowgill, Thomas Young, Mark T. Schwab, Julia A. Herrera, Laura Yanina Witmer, Lawrence Katsamenis, Orestis L. Bowman, Charlotte Brusatte, Stephen L. |
author |
Higgins, Robert R. |
author_facet |
Higgins, Robert R. Cowgill, Thomas Young, Mark T. Schwab, Julia A. Herrera, Laura Yanina Witmer, Lawrence Katsamenis, Orestis L. Bowman, Charlotte Brusatte, Stephen L. |
author_role |
author |
author2 |
Cowgill, Thomas Young, Mark T. Schwab, Julia A. Herrera, Laura Yanina Witmer, Lawrence Katsamenis, Orestis L. Bowman, Charlotte Brusatte, Stephen L. |
author2_role |
author author author author author author author author |
dc.subject.none.fl_str_mv |
CROCODYLOMORPHA ENDOCRANIAL ANATOMY METRIORHYNCHIDAE THALATTOSUCHIA THALATTOSUCHUS SUPERCILIOSUS |
topic |
CROCODYLOMORPHA ENDOCRANIAL ANATOMY METRIORHYNCHIDAE THALATTOSUCHIA THALATTOSUCHUS SUPERCILIOSUS |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
dc.description.none.fl_txt_mv |
Thalattosuchian crocodylomorphs underwent a major evolutionary transition, evolving from semiaquatic forms reminiscent of extant crocodylians, into pelagic marine forms with flippers, a tail fin and smooth scaleless skin. These fully aquatic forms – the Metriorhynchidae – evolved a novel suite of endocranial anatomies hypothesised to be related to living in saltwater. However, much remains to be discovered about the evolution of these internal braincase structures. Herein, we describe the endocranial anatomy of an early diverging metriorhynchid, Thalattosuchus superciliosus, using microfocus computed tomography (μCT) data and three-dimensional modelling. We compared it against geosaurine and metriorhynchine metriorhynchids, as well as the early diverging metriorhynchoid Pelagosaurus. We found that non-geosaurine metriorhynchids differ from geosaurines in having less laterally expanded cerebral hemispheres, shallowercurvatures of the brain’s dorsal margin, and lacking the ventral deflection of the pneumatic diverticulum ventral to the pituitary fossa chamber. However, early-diverging metriorhynchids have well-defined otoccipital diverticula and lacked the ‘extreme pelagic’ endosseous labyrinth morphology. We hypothesise that early metriorhynchids were not adapted to a sustained pursuit lifestyle. Moreover, we posit that within both metriorhynchid subfamilies there was parallel evolution towards becoming pursuit predators. Fil: Higgins, Robert R.. University of Edinburgh; Reino Unido Fil: Cowgill, Thomas. University of Edinburgh; Reino Unido Fil: Young, Mark T.. University of Edinburgh; Reino Unido Fil: Schwab, Julia A.. University of Edinburgh; Reino Unido 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 Fil: Witmer, Lawrence. Ohio University; Estados Unidos Fil: Katsamenis, Orestis L.. University of Southampton; Reino Unido Fil: Bowman, Charlotte. University of Edinburgh; Reino Unido Fil: Brusatte, Stephen L.. University of Edinburgh; Reino Unido |
description |
Thalattosuchian crocodylomorphs underwent a major evolutionary transition, evolving from semiaquatic forms reminiscent of extant crocodylians, into pelagic marine forms with flippers, a tail fin and smooth scaleless skin. These fully aquatic forms – the Metriorhynchidae – evolved a novel suite of endocranial anatomies hypothesised to be related to living in saltwater. However, much remains to be discovered about the evolution of these internal braincase structures. Herein, we describe the endocranial anatomy of an early diverging metriorhynchid, Thalattosuchus superciliosus, using microfocus computed tomography (μCT) data and three-dimensional modelling. We compared it against geosaurine and metriorhynchine metriorhynchids, as well as the early diverging metriorhynchoid Pelagosaurus. We found that non-geosaurine metriorhynchids differ from geosaurines in having less laterally expanded cerebral hemispheres, shallowercurvatures of the brain’s dorsal margin, and lacking the ventral deflection of the pneumatic diverticulum ventral to the pituitary fossa chamber. However, early-diverging metriorhynchids have well-defined otoccipital diverticula and lacked the ‘extreme pelagic’ endosseous labyrinth morphology. We hypothesise that early metriorhynchids were not adapted to a sustained pursuit lifestyle. Moreover, we posit that within both metriorhynchid subfamilies there was parallel evolution towards becoming pursuit predators. |
publishDate |
2024 |
dc.date.none.fl_str_mv |
2024-11 |
dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
format |
article |
status_str |
publishedVersion |
dc.identifier.none.fl_str_mv |
http://hdl.handle.net/11336/256334 Higgins, Robert R.; Cowgill, Thomas; Young, Mark T.; Schwab, Julia A.; Herrera, Laura Yanina; et al.; The internal braincase anatomy of Thalattosuchus superciliosus – with implications for the endocranial evolution of metriorhynchid crocodylomorphs; Taylor & Francis; Historical Biology; 2024; 11-2024; 1-12 0891-2963 1029-2381 CONICET Digital CONICET |
url |
http://hdl.handle.net/11336/256334 |
identifier_str_mv |
Higgins, Robert R.; Cowgill, Thomas; Young, Mark T.; Schwab, Julia A.; Herrera, Laura Yanina; et al.; The internal braincase anatomy of Thalattosuchus superciliosus – with implications for the endocranial evolution of metriorhynchid crocodylomorphs; Taylor & Francis; Historical Biology; 2024; 11-2024; 1-12 0891-2963 1029-2381 CONICET Digital CONICET |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/url/https://www.tandfonline.com/doi/full/10.1080/08912963.2024.2427096 info:eu-repo/semantics/altIdentifier/doi/10.1080/08912963.2024.2427096 |
dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/2.5/ar/ |
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openAccess |
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https://creativecommons.org/licenses/by/2.5/ar/ |
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application/pdf application/pdf |
dc.publisher.none.fl_str_mv |
Taylor & Francis |
publisher.none.fl_str_mv |
Taylor & Francis |
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Consejo Nacional de Investigaciones Científicas y Técnicas |
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CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas |
repository.mail.fl_str_mv |
dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar |
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1844614310459867136 |
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13.070432 |