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dc.contributor.author
Kummell, S.
dc.contributor.author
Abdala, Nestor Fernando
dc.contributor.author
Sassoon, J.
dc.contributor.author
Abdala, Virginia Sara Luz
dc.date.available
2021-10-07T14:20:49Z
dc.date.issued
2020-11
dc.identifier.citation
Kummell, S.; Abdala, Nestor Fernando; Sassoon, J.; Abdala, Virginia Sara Luz; Evolution and identity of synapsid carpal bones; Polish Academy of Sciences. Institute of Paleobiology; Acta Palaeontologica Polonica; 11-2020
dc.identifier.issn
1732-2421
dc.identifier.uri
http://hdl.handle.net/11336/143106
dc.description.abstract
To date there is little information on carpal bone homology in late Palaeozoic and Mesozoic Synapsida. Crucial to the understanding of homology in synapsid carpal elements is the fact that different nomenclatures are used for the carpals of non-mammaliamorph Synapsida (Gegenbauer?s canonical nomenclature) and Mammaliaformes (mammalian nomencla-ture). The homologies of the carpals of non-mammaliamorph synapsids and mammals were established early last century and have not been reviewed since then. Here we provide a detailed study of the carpal bones of synapsids ranging in age from the early Permian to Late Cretaceous. The mammaliamorph lunate, previously considered the homologue of the intermedium of non-mammaliamorph synapsids, is interpreted here as homologous to their lateral centrale. We interpret the single mammaliamorph centrale as a homologue of the medial centrale of non-mammaliamorph synapsids. In some synapsid specimens, we found that one or two centralia are fused to the radiale (e.g., the gorgonopsian Arctognathus and tritylodontid Bienotheroides), supporting a digging habit. A third centrale is present in the therocephalian Theriognathus, very likely an abnormal duplication. An additional medial bone in a biarmosuchian was interpreted as a prepollex/sesamoid. A cartilaginous prepollex/sesamoid may also have been present in several non-mammaliamorph synapsids, which have an open space proximal to distal carpal I. Distal carpal V is completely lost in dicynodonts and it is mainly fused to distal carpal IV in the adult stage of most other therapsid groups, but showed a delayed development in most non-mammaliamorph cynodonts. In mammaliamorphs, distal carpal V is not present. Our observations provide an up-dated revision of synapsid carpal homologies, mainly on the basis of position and anatomical contacts and also taking into account the results of embryological studies
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Polish Academy of Sciences. Institute of Paleobiology
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
SYNAPSIDA
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CARPUS
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INTERMEDIUM
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LUNATE
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Paleontología
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Ciencias de la Tierra y relacionadas con el Medio Ambiente
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CIENCIAS NATURALES Y EXACTAS
dc.title
Evolution and identity of synapsid carpal bones
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2021-09-07T14:45:59Z
dc.journal.pais
Polonia
dc.journal.ciudad
Varsovia
dc.description.fil
Fil: Kummell, S.. University Witten/herdecke; Alemania
dc.description.fil
Fil: Abdala, Nestor Fernando. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - Tucumán. Unidad Ejecutora Lillo; Argentina
dc.description.fil
Fil: Sassoon, J.. University Of Bristol; Reino Unido
dc.description.fil
Fil: Abdala, Virginia Sara Luz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto de Biodiversidad Neotropical. Universidad Nacional de Tucumán. Facultad de Ciencias Naturales e Instituto Miguel Lillo. Instituto de Biodiversidad Neotropical. Instituto de Biodiversidad Neotropical; Argentina
dc.journal.title
Acta Palaeontologica Polonica
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.4202/app.00709.2019
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