Macelognathus vagans (archosauria; crocodylomorpha): new information on the braincase using ct-data
- Autores
- Leardi, Juan Martín; Pol, Diego; Clark, James Matthew
- Año de publicación
- 2016
- Idioma
- inglés
- Tipo de recurso
- documento de conferencia
- Estado
- versión publicada
- Descripción
- Macelognathus vagans was originally described as a dinosaur by Marsh from the Late Jurassic Morrison Formation of Wyoming and later Ostrom suggested crocodilian affinities. More recently, Göhlich and collaborators identified new material from Colorado as a basal crocodylomorph. However, a partial skull found in association with mandibular and postcranial remains was not described. The skull preserves most of the posterior part, including the braincase, and probably belongs to a juvenile given its dorsal curvature. Due to the small size and delicate structures within the braincase, micro CT studies were performed on this specimen. This new material reinforces the non-crocodyliform crocodylomorph affinities of Macelognathus as it bears a large otic aperture, unfused frontals and lacks ornamentation on the dorsal cranial bones. The internal struc-tures also support these affinities as this specimen has traits (i.e., heavily pneumatized and expanded basisphenoid; the presence of additional pneumatic features on the braincase; and the otoccipital-quadrate contact) not present in most basal crocodylomorphs. Furthermore, the presence of a wide supraoccipital and a cranioquadrate passage are traits shared with Almadasuchus from the early Late Jurassic of Argentina. The new anatomical information was incorporated in a phylogenetic dataset, expanding both character and taxon sampling. Macelognathus was recovered as one of the most derived noncrocodyliform crocodylomorphs, forming a clade with two other Late Jurassic taxa (Almadasuchus and the Morrison Hallopus). This derived clade is characterized by having a higher degree of suturing of the braincase, posteriorly closed otic aperture (paralleled in mesoeucrocodylians) and cursorial adaptations.
Fil: Leardi, Juan Martín. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
Fil: Pol, Diego. Museo Paleontológico Egidio Feruglio; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Clark, James Matthew. The George Washington University; Estados Unidos
XXX Jornadas Argentinas de Paleontología de Vertebrados
Buenos Aires
Argentina
Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"
Asociación Paleontológica Argentina - Materia
-
Crocodylomorpha
Braincase
Evolution
Phylogeny - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/242312
Ver los metadatos del registro completo
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Macelognathus vagans (archosauria; crocodylomorpha): new information on the braincase using ct-dataLeardi, Juan MartínPol, DiegoClark, James MatthewCrocodylomorphaBraincaseEvolutionPhylogenyhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Macelognathus vagans was originally described as a dinosaur by Marsh from the Late Jurassic Morrison Formation of Wyoming and later Ostrom suggested crocodilian affinities. More recently, Göhlich and collaborators identified new material from Colorado as a basal crocodylomorph. However, a partial skull found in association with mandibular and postcranial remains was not described. The skull preserves most of the posterior part, including the braincase, and probably belongs to a juvenile given its dorsal curvature. Due to the small size and delicate structures within the braincase, micro CT studies were performed on this specimen. This new material reinforces the non-crocodyliform crocodylomorph affinities of Macelognathus as it bears a large otic aperture, unfused frontals and lacks ornamentation on the dorsal cranial bones. The internal struc-tures also support these affinities as this specimen has traits (i.e., heavily pneumatized and expanded basisphenoid; the presence of additional pneumatic features on the braincase; and the otoccipital-quadrate contact) not present in most basal crocodylomorphs. Furthermore, the presence of a wide supraoccipital and a cranioquadrate passage are traits shared with Almadasuchus from the early Late Jurassic of Argentina. The new anatomical information was incorporated in a phylogenetic dataset, expanding both character and taxon sampling. Macelognathus was recovered as one of the most derived noncrocodyliform crocodylomorphs, forming a clade with two other Late Jurassic taxa (Almadasuchus and the Morrison Hallopus). This derived clade is characterized by having a higher degree of suturing of the braincase, posteriorly closed otic aperture (paralleled in mesoeucrocodylians) and cursorial adaptations.Fil: Leardi, Juan Martín. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; ArgentinaFil: Pol, Diego. Museo Paleontológico Egidio Feruglio; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Clark, James Matthew. The George Washington University; Estados UnidosXXX Jornadas Argentinas de Paleontología de VertebradosBuenos AiresArgentinaMuseo Argentino de Ciencias Naturales "Bernardino Rivadavia"Asociación Paleontológica ArgentinaAsociación Paleontológica Argentina2016info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjectJornadaJournalhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/242312Macelognathus vagans (archosauria; crocodylomorpha): new information on the braincase using ct-data; XXX Jornadas Argentinas de Paleontología de Vertebrados; Buenos Aires; Argentina; 2016; 24-251851-8044CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.ameghiniana.org.ar/index.php/ameghiniana/article/view/3066/4807Nacionalinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:34:41Zoai:ri.conicet.gov.ar:11336/242312instacron: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 10:34:41.745CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
Macelognathus vagans (archosauria; crocodylomorpha): new information on the braincase using ct-data |
title |
Macelognathus vagans (archosauria; crocodylomorpha): new information on the braincase using ct-data |
spellingShingle |
Macelognathus vagans (archosauria; crocodylomorpha): new information on the braincase using ct-data Leardi, Juan Martín Crocodylomorpha Braincase Evolution Phylogeny |
title_short |
Macelognathus vagans (archosauria; crocodylomorpha): new information on the braincase using ct-data |
title_full |
Macelognathus vagans (archosauria; crocodylomorpha): new information on the braincase using ct-data |
title_fullStr |
Macelognathus vagans (archosauria; crocodylomorpha): new information on the braincase using ct-data |
title_full_unstemmed |
Macelognathus vagans (archosauria; crocodylomorpha): new information on the braincase using ct-data |
title_sort |
Macelognathus vagans (archosauria; crocodylomorpha): new information on the braincase using ct-data |
dc.creator.none.fl_str_mv |
Leardi, Juan Martín Pol, Diego Clark, James Matthew |
author |
Leardi, Juan Martín |
author_facet |
Leardi, Juan Martín Pol, Diego Clark, James Matthew |
author_role |
author |
author2 |
Pol, Diego Clark, James Matthew |
author2_role |
author author |
dc.subject.none.fl_str_mv |
Crocodylomorpha Braincase Evolution Phylogeny |
topic |
Crocodylomorpha Braincase Evolution Phylogeny |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
dc.description.none.fl_txt_mv |
Macelognathus vagans was originally described as a dinosaur by Marsh from the Late Jurassic Morrison Formation of Wyoming and later Ostrom suggested crocodilian affinities. More recently, Göhlich and collaborators identified new material from Colorado as a basal crocodylomorph. However, a partial skull found in association with mandibular and postcranial remains was not described. The skull preserves most of the posterior part, including the braincase, and probably belongs to a juvenile given its dorsal curvature. Due to the small size and delicate structures within the braincase, micro CT studies were performed on this specimen. This new material reinforces the non-crocodyliform crocodylomorph affinities of Macelognathus as it bears a large otic aperture, unfused frontals and lacks ornamentation on the dorsal cranial bones. The internal struc-tures also support these affinities as this specimen has traits (i.e., heavily pneumatized and expanded basisphenoid; the presence of additional pneumatic features on the braincase; and the otoccipital-quadrate contact) not present in most basal crocodylomorphs. Furthermore, the presence of a wide supraoccipital and a cranioquadrate passage are traits shared with Almadasuchus from the early Late Jurassic of Argentina. The new anatomical information was incorporated in a phylogenetic dataset, expanding both character and taxon sampling. Macelognathus was recovered as one of the most derived noncrocodyliform crocodylomorphs, forming a clade with two other Late Jurassic taxa (Almadasuchus and the Morrison Hallopus). This derived clade is characterized by having a higher degree of suturing of the braincase, posteriorly closed otic aperture (paralleled in mesoeucrocodylians) and cursorial adaptations. Fil: Leardi, Juan Martín. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina Fil: Pol, Diego. Museo Paleontológico Egidio Feruglio; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Clark, James Matthew. The George Washington University; Estados Unidos XXX Jornadas Argentinas de Paleontología de Vertebrados Buenos Aires Argentina Museo Argentino de Ciencias Naturales "Bernardino Rivadavia" Asociación Paleontológica Argentina |
description |
Macelognathus vagans was originally described as a dinosaur by Marsh from the Late Jurassic Morrison Formation of Wyoming and later Ostrom suggested crocodilian affinities. More recently, Göhlich and collaborators identified new material from Colorado as a basal crocodylomorph. However, a partial skull found in association with mandibular and postcranial remains was not described. The skull preserves most of the posterior part, including the braincase, and probably belongs to a juvenile given its dorsal curvature. Due to the small size and delicate structures within the braincase, micro CT studies were performed on this specimen. This new material reinforces the non-crocodyliform crocodylomorph affinities of Macelognathus as it bears a large otic aperture, unfused frontals and lacks ornamentation on the dorsal cranial bones. The internal struc-tures also support these affinities as this specimen has traits (i.e., heavily pneumatized and expanded basisphenoid; the presence of additional pneumatic features on the braincase; and the otoccipital-quadrate contact) not present in most basal crocodylomorphs. Furthermore, the presence of a wide supraoccipital and a cranioquadrate passage are traits shared with Almadasuchus from the early Late Jurassic of Argentina. The new anatomical information was incorporated in a phylogenetic dataset, expanding both character and taxon sampling. Macelognathus was recovered as one of the most derived noncrocodyliform crocodylomorphs, forming a clade with two other Late Jurassic taxa (Almadasuchus and the Morrison Hallopus). This derived clade is characterized by having a higher degree of suturing of the braincase, posteriorly closed otic aperture (paralleled in mesoeucrocodylians) and cursorial adaptations. |
publishDate |
2016 |
dc.date.none.fl_str_mv |
2016 |
dc.type.none.fl_str_mv |
info:eu-repo/semantics/publishedVersion info:eu-repo/semantics/conferenceObject Jornada Journal http://purl.org/coar/resource_type/c_5794 info:ar-repo/semantics/documentoDeConferencia |
status_str |
publishedVersion |
format |
conferenceObject |
dc.identifier.none.fl_str_mv |
http://hdl.handle.net/11336/242312 Macelognathus vagans (archosauria; crocodylomorpha): new information on the braincase using ct-data; XXX Jornadas Argentinas de Paleontología de Vertebrados; Buenos Aires; Argentina; 2016; 24-25 1851-8044 CONICET Digital CONICET |
url |
http://hdl.handle.net/11336/242312 |
identifier_str_mv |
Macelognathus vagans (archosauria; crocodylomorpha): new information on the braincase using ct-data; XXX Jornadas Argentinas de Paleontología de Vertebrados; Buenos Aires; Argentina; 2016; 24-25 1851-8044 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.ameghiniana.org.ar/index.php/ameghiniana/article/view/3066/4807 |
dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
eu_rights_str_mv |
openAccess |
rights_invalid_str_mv |
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
dc.format.none.fl_str_mv |
application/pdf application/pdf |
dc.coverage.none.fl_str_mv |
Nacional |
dc.publisher.none.fl_str_mv |
Asociación Paleontológica Argentina |
publisher.none.fl_str_mv |
Asociación Paleontológica Argentina |
dc.source.none.fl_str_mv |
reponame:CONICET Digital (CONICET) instname:Consejo Nacional de Investigaciones Científicas y Técnicas |
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CONICET Digital (CONICET) |
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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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13.070432 |