Filling a key gap in growth patterns of Pseudosuchia through the osteohistology of Dynamosuchus collisensis (Ornithosuchidae: Archosauria)

Autores
Farias, B.; Müller, Rodrigo Temp; Prestes de Bem, Fabiula; Von Baczko, Belen; Desojo, Julia Brenda; Soares, Marina Bento
Año de publicación
2026
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Ornithosuchidae are among the least studied pseudosuchians from a histological perspective. We present the first long-bone osteohistological data for the ornithosuchid Dynamosuchus collisensis, based on mid-diaphyseal thin sections of the humerus and femur, supplemented by a rib. The long bones show cortices dominated by highly vascularized woven–parallel complex and parallel-fibred bone, with three well-defined annuli and a fourth incipient one near the periosteal margin. Medullary expansion occurs through endosteal resorption, and secondary osteons in formation are present. The rib displays lower vascularization, suggesting reduced growth rates in axial elements. Open neurocentral sutures, the absence of an EFS and the lack of peripheral slowdown in cortical deposition indicate that the holotype was skeletally immature, and probably sexually immature, at the time of death. This suggests that the individual had not yet reached its maximum body size and would probably have attained a larger size, consistent with a role as a top-tier predator in Carnian ecosystems. These features support sustained rapid growth, contrasting with the predominantly slow growth of late-diverging crocodylomorphs and more closely resembling early loricatans and poposauroids. Because Ornithosuchidae occupy an early-diverging position within Pseudosuchia, these data support the hypothesis that fast growth may represent a plesiomorphic condition within the clade.
Fil: Farias, B.. Universidade Federal do Rio de Janeiro; Brasil
Fil: Müller, Rodrigo Temp. Universidade Federal de Santa Maria; Brasil
Fil: Prestes de Bem, Fabiula. Universidade Federal de Santa Maria; Brasil
Fil: Von Baczko, Belen. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina
Fil: Desojo, Julia Brenda. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Paleontología Vertebrados; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Soares, Marina Bento. Universidade Federal do Rio de Janeiro; Brasil
Materia
Triassic
Bone histology
Hyperodapedon Assemblage Zone
Ontogeny
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/288895
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/288895
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Filling a key gap in growth patterns of Pseudosuchia through the osteohistology of Dynamosuchus collisensis (Ornithosuchidae: Archosauria)Farias, B.Müller, Rodrigo TempPrestes de Bem, FabiulaVon Baczko, BelenDesojo, Julia BrendaSoares, Marina BentoTriassicBone histologyHyperodapedon Assemblage ZoneOntogenyhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Ornithosuchidae are among the least studied pseudosuchians from a histological perspective. We present the first long-bone osteohistological data for the ornithosuchid Dynamosuchus collisensis, based on mid-diaphyseal thin sections of the humerus and femur, supplemented by a rib. The long bones show cortices dominated by highly vascularized woven–parallel complex and parallel-fibred bone, with three well-defined annuli and a fourth incipient one near the periosteal margin. Medullary expansion occurs through endosteal resorption, and secondary osteons in formation are present. The rib displays lower vascularization, suggesting reduced growth rates in axial elements. Open neurocentral sutures, the absence of an EFS and the lack of peripheral slowdown in cortical deposition indicate that the holotype was skeletally immature, and probably sexually immature, at the time of death. This suggests that the individual had not yet reached its maximum body size and would probably have attained a larger size, consistent with a role as a top-tier predator in Carnian ecosystems. These features support sustained rapid growth, contrasting with the predominantly slow growth of late-diverging crocodylomorphs and more closely resembling early loricatans and poposauroids. Because Ornithosuchidae occupy an early-diverging position within Pseudosuchia, these data support the hypothesis that fast growth may represent a plesiomorphic condition within the clade.Fil: Farias, B.. Universidade Federal do Rio de Janeiro; BrasilFil: Müller, Rodrigo Temp. Universidade Federal de Santa Maria; BrasilFil: Prestes de Bem, Fabiula. Universidade Federal de Santa Maria; BrasilFil: Von Baczko, Belen. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; ArgentinaFil: Desojo, Julia Brenda. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Paleontología Vertebrados; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Soares, Marina Bento. Universidade Federal do Rio de Janeiro; BrasilThe Royal Society2026-02info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/288895Farias, B.; Müller, Rodrigo Temp; Prestes de Bem, Fabiula; Von Baczko, Belen; Desojo, Julia Brenda; et al.; Filling a key gap in growth patterns of Pseudosuchia through the osteohistology of Dynamosuchus collisensis (Ornithosuchidae: Archosauria); The Royal Society; Royal Society Open Science; 13; 2; 2-2026; 1-192054-5703CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://royalsocietypublishing.org/rsos/article/13/2/252042/480032/Filling-a-key-gap-in-growth-patterns-ofinfo:eu-repo/semantics/altIdentifier/doi/10.1098/rsos.252042info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2026-06-17T09:44:51Zoai:ri.conicet.gov.ar:11336/288895instacron: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:34982026-06-17 09:44:51.553CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Filling a key gap in growth patterns of Pseudosuchia through the osteohistology of Dynamosuchus collisensis (Ornithosuchidae: Archosauria)
title Filling a key gap in growth patterns of Pseudosuchia through the osteohistology of Dynamosuchus collisensis (Ornithosuchidae: Archosauria)
spellingShingle Filling a key gap in growth patterns of Pseudosuchia through the osteohistology of Dynamosuchus collisensis (Ornithosuchidae: Archosauria)
Farias, B.
Triassic
Bone histology
Hyperodapedon Assemblage Zone
Ontogeny
title_short Filling a key gap in growth patterns of Pseudosuchia through the osteohistology of Dynamosuchus collisensis (Ornithosuchidae: Archosauria)
title_full Filling a key gap in growth patterns of Pseudosuchia through the osteohistology of Dynamosuchus collisensis (Ornithosuchidae: Archosauria)
title_fullStr Filling a key gap in growth patterns of Pseudosuchia through the osteohistology of Dynamosuchus collisensis (Ornithosuchidae: Archosauria)
title_full_unstemmed Filling a key gap in growth patterns of Pseudosuchia through the osteohistology of Dynamosuchus collisensis (Ornithosuchidae: Archosauria)
title_sort Filling a key gap in growth patterns of Pseudosuchia through the osteohistology of Dynamosuchus collisensis (Ornithosuchidae: Archosauria)
dc.creator.none.fl_str_mv Farias, B.
Müller, Rodrigo Temp
Prestes de Bem, Fabiula
Von Baczko, Belen
Desojo, Julia Brenda
Soares, Marina Bento
author Farias, B.
author_facet Farias, B.
Müller, Rodrigo Temp
Prestes de Bem, Fabiula
Von Baczko, Belen
Desojo, Julia Brenda
Soares, Marina Bento
author_role author
author2 Müller, Rodrigo Temp
Prestes de Bem, Fabiula
Von Baczko, Belen
Desojo, Julia Brenda
Soares, Marina Bento
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Triassic
Bone histology
Hyperodapedon Assemblage Zone
Ontogeny
topic Triassic
Bone histology
Hyperodapedon Assemblage Zone
Ontogeny
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Ornithosuchidae are among the least studied pseudosuchians from a histological perspective. We present the first long-bone osteohistological data for the ornithosuchid Dynamosuchus collisensis, based on mid-diaphyseal thin sections of the humerus and femur, supplemented by a rib. The long bones show cortices dominated by highly vascularized woven–parallel complex and parallel-fibred bone, with three well-defined annuli and a fourth incipient one near the periosteal margin. Medullary expansion occurs through endosteal resorption, and secondary osteons in formation are present. The rib displays lower vascularization, suggesting reduced growth rates in axial elements. Open neurocentral sutures, the absence of an EFS and the lack of peripheral slowdown in cortical deposition indicate that the holotype was skeletally immature, and probably sexually immature, at the time of death. This suggests that the individual had not yet reached its maximum body size and would probably have attained a larger size, consistent with a role as a top-tier predator in Carnian ecosystems. These features support sustained rapid growth, contrasting with the predominantly slow growth of late-diverging crocodylomorphs and more closely resembling early loricatans and poposauroids. Because Ornithosuchidae occupy an early-diverging position within Pseudosuchia, these data support the hypothesis that fast growth may represent a plesiomorphic condition within the clade.
Fil: Farias, B.. Universidade Federal do Rio de Janeiro; Brasil
Fil: Müller, Rodrigo Temp. Universidade Federal de Santa Maria; Brasil
Fil: Prestes de Bem, Fabiula. Universidade Federal de Santa Maria; Brasil
Fil: Von Baczko, Belen. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina
Fil: Desojo, Julia Brenda. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Paleontología Vertebrados; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Soares, Marina Bento. Universidade Federal do Rio de Janeiro; Brasil
description Ornithosuchidae are among the least studied pseudosuchians from a histological perspective. We present the first long-bone osteohistological data for the ornithosuchid Dynamosuchus collisensis, based on mid-diaphyseal thin sections of the humerus and femur, supplemented by a rib. The long bones show cortices dominated by highly vascularized woven–parallel complex and parallel-fibred bone, with three well-defined annuli and a fourth incipient one near the periosteal margin. Medullary expansion occurs through endosteal resorption, and secondary osteons in formation are present. The rib displays lower vascularization, suggesting reduced growth rates in axial elements. Open neurocentral sutures, the absence of an EFS and the lack of peripheral slowdown in cortical deposition indicate that the holotype was skeletally immature, and probably sexually immature, at the time of death. This suggests that the individual had not yet reached its maximum body size and would probably have attained a larger size, consistent with a role as a top-tier predator in Carnian ecosystems. These features support sustained rapid growth, contrasting with the predominantly slow growth of late-diverging crocodylomorphs and more closely resembling early loricatans and poposauroids. Because Ornithosuchidae occupy an early-diverging position within Pseudosuchia, these data support the hypothesis that fast growth may represent a plesiomorphic condition within the clade.
publishDate 2026
dc.date.none.fl_str_mv 2026-02
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/11336/288895
Farias, B.; Müller, Rodrigo Temp; Prestes de Bem, Fabiula; Von Baczko, Belen; Desojo, Julia Brenda; et al.; Filling a key gap in growth patterns of Pseudosuchia through the osteohistology of Dynamosuchus collisensis (Ornithosuchidae: Archosauria); The Royal Society; Royal Society Open Science; 13; 2; 2-2026; 1-19
2054-5703
CONICET Digital
CONICET
url http://hdl.handle.net/11336/288895
identifier_str_mv Farias, B.; Müller, Rodrigo Temp; Prestes de Bem, Fabiula; Von Baczko, Belen; Desojo, Julia Brenda; et al.; Filling a key gap in growth patterns of Pseudosuchia through the osteohistology of Dynamosuchus collisensis (Ornithosuchidae: Archosauria); The Royal Society; Royal Society Open Science; 13; 2; 2-2026; 1-19
2054-5703
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://royalsocietypublishing.org/rsos/article/13/2/252042/480032/Filling-a-key-gap-in-growth-patterns-of
info:eu-repo/semantics/altIdentifier/doi/10.1098/rsos.252042
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv The Royal Society
publisher.none.fl_str_mv The Royal Society
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv 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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score 13.040872

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