Locomotor kinematics of the manus and pes in dinocephalian therapsids reconstructed from three-dimensional morphology of footprints from Gansfontein, South Africa

Autores
Blob, Richard W.; Wilson, Jeffrey A.; Marsicano, Claudia Alicia; Panko, Laura J.; Smith, Roger M.
Año de publicación
2017
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
The Gansfontein paleosurface from the Late PermianAbrahamskraal Formation (Beaufort Group, TapinocephalusAssemblage Zone) near Fraserburg, South Africa, preserves several vertebratetrackways. Among the best-preserved trackways is a series of several footprintsthat have been attributed to a single dinocephalian therapsid walking acrossthe surface. This attribution is based on both the large size of the footprints(25 cm in breadth), and the reduction of digit I in the manus and pes. However,a curious feature of this trackway is that, in contrast to the straight digitsindicated by skeletal specimens of dinocephalians, the digit impressions from theprints are curved so that their tips point medially. To test hypotheses aboutthe locomotor kinematics of the dinocephalian manus and pes that produced thesecurved-digit prints, we constructed contour maps that depicted how the depth ofan impression varied within individual prints. In our initial analysis, we constructedthe maps by pouring milk into the prints in successive increments of 2 mm inheight, and tracing the perimeters of filled areas on translucent paper fixedto the paleosurface by tape. We have also used surface scanners to generatedepth profiles with finer scale resolution. These analyses indicated that thedistal tips of digit impressions are among the shallowest portions of theprints, a pattern consistent with outward rotation of the hand and foot duringstance. In addition, heel impressions are lacking in the prints, indicatingthat the animal that made them may have used digitigrade foot posture. Spacing betweenleft and right prints is small, less than the breadth of individual prints.However, the presence of foot rotation during stance suggests thatdinocephalians used sprawling, rather than parasagittal limb posture. Closespacing of footprints likely resulted from a combination of lateral bending ofthe body and significant cranio-caudal limb excursion, rather than increasedadduction of the limbs under the body.
Fil: Blob, Richard W.. Clemson University; Estados Unidos
Fil: Wilson, Jeffrey A.. University of Michigan; Estados Unidos
Fil: Marsicano, Claudia Alicia. 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: Panko, Laura J.. Northwestern University; Estados Unidos
Fil: Smith, Roger M.. Iziko South African Museum Cape Town; Sudáfrica
77th Annual Meeting of the Society of Vertebrate Paleontology
Canadá
Society of Vertebrate Paleontology
Materia
Locomotor kinematics
Dinocephalia
Permian
Karoo Basin
South Africa
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/243612

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spelling Locomotor kinematics of the manus and pes in dinocephalian therapsids reconstructed from three-dimensional morphology of footprints from Gansfontein, South AfricaBlob, Richard W.Wilson, Jeffrey A.Marsicano, Claudia AliciaPanko, Laura J.Smith, Roger M.Locomotor kinematicsDinocephaliaPermianKaroo BasinSouth Africahttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The Gansfontein paleosurface from the Late PermianAbrahamskraal Formation (Beaufort Group, TapinocephalusAssemblage Zone) near Fraserburg, South Africa, preserves several vertebratetrackways. Among the best-preserved trackways is a series of several footprintsthat have been attributed to a single dinocephalian therapsid walking acrossthe surface. This attribution is based on both the large size of the footprints(25 cm in breadth), and the reduction of digit I in the manus and pes. However,a curious feature of this trackway is that, in contrast to the straight digitsindicated by skeletal specimens of dinocephalians, the digit impressions from theprints are curved so that their tips point medially. To test hypotheses aboutthe locomotor kinematics of the dinocephalian manus and pes that produced thesecurved-digit prints, we constructed contour maps that depicted how the depth ofan impression varied within individual prints. In our initial analysis, we constructedthe maps by pouring milk into the prints in successive increments of 2 mm inheight, and tracing the perimeters of filled areas on translucent paper fixedto the paleosurface by tape. We have also used surface scanners to generatedepth profiles with finer scale resolution. These analyses indicated that thedistal tips of digit impressions are among the shallowest portions of theprints, a pattern consistent with outward rotation of the hand and foot duringstance. In addition, heel impressions are lacking in the prints, indicatingthat the animal that made them may have used digitigrade foot posture. Spacing betweenleft and right prints is small, less than the breadth of individual prints.However, the presence of foot rotation during stance suggests thatdinocephalians used sprawling, rather than parasagittal limb posture. Closespacing of footprints likely resulted from a combination of lateral bending ofthe body and significant cranio-caudal limb excursion, rather than increasedadduction of the limbs under the body.Fil: Blob, Richard W.. Clemson University; Estados UnidosFil: Wilson, Jeffrey A.. University of Michigan; Estados UnidosFil: Marsicano, Claudia Alicia. 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: Panko, Laura J.. Northwestern University; Estados UnidosFil: Smith, Roger M.. Iziko South African Museum Cape Town; Sudáfrica77th Annual Meeting of the Society of Vertebrate PaleontologyCanadáSociety of Vertebrate PaleontologySociety of Vertebrate Paleontology2017info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjectReuniónBookhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfapplication/vnd.openxmlformats-officedocument.wordprocessingml.documentapplication/pdfhttp://hdl.handle.net/11336/243612Locomotor kinematics of the manus and pes in dinocephalian therapsids reconstructed from three-dimensional morphology of footprints from Gansfontein, South Africa; 77th Annual Meeting of the Society of Vertebrate Paleontology; Canadá; 2017; 82-82CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://vertpaleo.org/future-past-meetings/Internacionalinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:32:50Zoai:ri.conicet.gov.ar:11336/243612instacron: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 09:32:50.503CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Locomotor kinematics of the manus and pes in dinocephalian therapsids reconstructed from three-dimensional morphology of footprints from Gansfontein, South Africa
title Locomotor kinematics of the manus and pes in dinocephalian therapsids reconstructed from three-dimensional morphology of footprints from Gansfontein, South Africa
spellingShingle Locomotor kinematics of the manus and pes in dinocephalian therapsids reconstructed from three-dimensional morphology of footprints from Gansfontein, South Africa
Blob, Richard W.
Locomotor kinematics
Dinocephalia
Permian
Karoo Basin
South Africa
title_short Locomotor kinematics of the manus and pes in dinocephalian therapsids reconstructed from three-dimensional morphology of footprints from Gansfontein, South Africa
title_full Locomotor kinematics of the manus and pes in dinocephalian therapsids reconstructed from three-dimensional morphology of footprints from Gansfontein, South Africa
title_fullStr Locomotor kinematics of the manus and pes in dinocephalian therapsids reconstructed from three-dimensional morphology of footprints from Gansfontein, South Africa
title_full_unstemmed Locomotor kinematics of the manus and pes in dinocephalian therapsids reconstructed from three-dimensional morphology of footprints from Gansfontein, South Africa
title_sort Locomotor kinematics of the manus and pes in dinocephalian therapsids reconstructed from three-dimensional morphology of footprints from Gansfontein, South Africa
dc.creator.none.fl_str_mv Blob, Richard W.
Wilson, Jeffrey A.
Marsicano, Claudia Alicia
Panko, Laura J.
Smith, Roger M.
author Blob, Richard W.
author_facet Blob, Richard W.
Wilson, Jeffrey A.
Marsicano, Claudia Alicia
Panko, Laura J.
Smith, Roger M.
author_role author
author2 Wilson, Jeffrey A.
Marsicano, Claudia Alicia
Panko, Laura J.
Smith, Roger M.
author2_role author
author
author
author
dc.subject.none.fl_str_mv Locomotor kinematics
Dinocephalia
Permian
Karoo Basin
South Africa
topic Locomotor kinematics
Dinocephalia
Permian
Karoo Basin
South Africa
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The Gansfontein paleosurface from the Late PermianAbrahamskraal Formation (Beaufort Group, TapinocephalusAssemblage Zone) near Fraserburg, South Africa, preserves several vertebratetrackways. Among the best-preserved trackways is a series of several footprintsthat have been attributed to a single dinocephalian therapsid walking acrossthe surface. This attribution is based on both the large size of the footprints(25 cm in breadth), and the reduction of digit I in the manus and pes. However,a curious feature of this trackway is that, in contrast to the straight digitsindicated by skeletal specimens of dinocephalians, the digit impressions from theprints are curved so that their tips point medially. To test hypotheses aboutthe locomotor kinematics of the dinocephalian manus and pes that produced thesecurved-digit prints, we constructed contour maps that depicted how the depth ofan impression varied within individual prints. In our initial analysis, we constructedthe maps by pouring milk into the prints in successive increments of 2 mm inheight, and tracing the perimeters of filled areas on translucent paper fixedto the paleosurface by tape. We have also used surface scanners to generatedepth profiles with finer scale resolution. These analyses indicated that thedistal tips of digit impressions are among the shallowest portions of theprints, a pattern consistent with outward rotation of the hand and foot duringstance. In addition, heel impressions are lacking in the prints, indicatingthat the animal that made them may have used digitigrade foot posture. Spacing betweenleft and right prints is small, less than the breadth of individual prints.However, the presence of foot rotation during stance suggests thatdinocephalians used sprawling, rather than parasagittal limb posture. Closespacing of footprints likely resulted from a combination of lateral bending ofthe body and significant cranio-caudal limb excursion, rather than increasedadduction of the limbs under the body.
Fil: Blob, Richard W.. Clemson University; Estados Unidos
Fil: Wilson, Jeffrey A.. University of Michigan; Estados Unidos
Fil: Marsicano, Claudia Alicia. 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: Panko, Laura J.. Northwestern University; Estados Unidos
Fil: Smith, Roger M.. Iziko South African Museum Cape Town; Sudáfrica
77th Annual Meeting of the Society of Vertebrate Paleontology
Canadá
Society of Vertebrate Paleontology
description The Gansfontein paleosurface from the Late PermianAbrahamskraal Formation (Beaufort Group, TapinocephalusAssemblage Zone) near Fraserburg, South Africa, preserves several vertebratetrackways. Among the best-preserved trackways is a series of several footprintsthat have been attributed to a single dinocephalian therapsid walking acrossthe surface. This attribution is based on both the large size of the footprints(25 cm in breadth), and the reduction of digit I in the manus and pes. However,a curious feature of this trackway is that, in contrast to the straight digitsindicated by skeletal specimens of dinocephalians, the digit impressions from theprints are curved so that their tips point medially. To test hypotheses aboutthe locomotor kinematics of the dinocephalian manus and pes that produced thesecurved-digit prints, we constructed contour maps that depicted how the depth ofan impression varied within individual prints. In our initial analysis, we constructedthe maps by pouring milk into the prints in successive increments of 2 mm inheight, and tracing the perimeters of filled areas on translucent paper fixedto the paleosurface by tape. We have also used surface scanners to generatedepth profiles with finer scale resolution. These analyses indicated that thedistal tips of digit impressions are among the shallowest portions of theprints, a pattern consistent with outward rotation of the hand and foot duringstance. In addition, heel impressions are lacking in the prints, indicatingthat the animal that made them may have used digitigrade foot posture. Spacing betweenleft and right prints is small, less than the breadth of individual prints.However, the presence of foot rotation during stance suggests thatdinocephalians used sprawling, rather than parasagittal limb posture. Closespacing of footprints likely resulted from a combination of lateral bending ofthe body and significant cranio-caudal limb excursion, rather than increasedadduction of the limbs under the body.
publishDate 2017
dc.date.none.fl_str_mv 2017
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info:eu-repo/semantics/conferenceObject
Reunión
Book
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/11336/243612
Locomotor kinematics of the manus and pes in dinocephalian therapsids reconstructed from three-dimensional morphology of footprints from Gansfontein, South Africa; 77th Annual Meeting of the Society of Vertebrate Paleontology; Canadá; 2017; 82-82
CONICET Digital
CONICET
url http://hdl.handle.net/11336/243612
identifier_str_mv Locomotor kinematics of the manus and pes in dinocephalian therapsids reconstructed from three-dimensional morphology of footprints from Gansfontein, South Africa; 77th Annual Meeting of the Society of Vertebrate Paleontology; Canadá; 2017; 82-82
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
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publisher.none.fl_str_mv Society of Vertebrate Paleontology
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