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dc.contributor.author
Fontanarrosa, Gabriela
dc.contributor.author
Abdala, Nestor Fernando
dc.contributor.author
Kümmell, Susanna
dc.contributor.author
Gess, Robert
dc.date.available
2019-11-29T18:23:40Z
dc.date.issued
2018-07
dc.identifier.citation
Fontanarrosa, Gabriela; Abdala, Nestor Fernando; Kümmell, Susanna; Gess, Robert; The manus of Tetracynodon (Therapsida: Therocephalia) provides evidence for survival strategies following the Permo-Triassic extinction; Society of Vertebrate Paleontology; Journal of Vertebrate Paleontology; 38; 4; 7-2018; 1-13
dc.identifier.issn
0272-4634
dc.identifier.uri
http://hdl.handle.net/11336/90958
dc.description.abstract
We present a comprehensive qualitative and quantitative study of the manus of a new therocephalian specimen referable to Tetracynodon from the Early Triassic of South Africa. We examined 18 specimens, representing at least 12 genera, including basal therocephalians (Lycosuchidae and Scylacosauridae) and eutherocephalians (Akidnognathidae, Whaitsioidea and Baurioidea). A temporal range of 23 million years through the Permo-Triassic (Wordian to Anisian) was surveyed. A principal component analysis of the therocephalian manus indicates that (1) metacarpals II, III, and IV acted as a module of which the medial and lateral elements (metacarpals I and V) were independent from each other; and (2) the proximal carpals, ulnare, and radiale lengths show contrasting variation in their measurements (e.g., groups with longer ulnares tend to have shorter radiales). The manus of Permian and Triassic taxa occupy separate regions in morphospace. This segregation pattern suggests selection for a manus with slender, elongated second to fourth metacarpals during and after the Permo-Triassic mass extinction. We show a heterogeneous condition of the fifth distal carpal bone. Although usually interpreted as fused to the fourth distal carpal or absent, the fifth distal carpal was present as a cartilaginous element in Tetracynodon. Strong and proportionally long unguals in relation to length of digits III and IV, wide and stocky basal phalanges, and short non-ungual phalanges strongly suggest that Tetracynodon was a scratch-digger. This supports the proposition that burrowing was an important behavioral strategy of terrestrial taxa during and after the Permo-Triassic mass extinction.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Society of Vertebrate Paleontology
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
THEROCEPHALIA
dc.subject
MANUS
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TETRACYNODON
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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
The manus of Tetracynodon (Therapsida: Therocephalia) provides evidence for survival strategies following the Permo-Triassic extinction
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2019-10-16T19:13:05Z
dc.identifier.eissn
1937-2809
dc.journal.volume
38
dc.journal.number
4
dc.journal.pagination
1-13
dc.journal.pais
Estados Unidos
dc.journal.ciudad
Lawrence
dc.description.fil
Fil: Fontanarrosa, Gabriela. 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.description.fil
Fil: Abdala, Nestor Fernando. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - Tucumán. Unidad Ejecutora Lillo; Argentina. Fundación Miguel Lillo; Argentina. University of the Witwatersrand; Sudáfrica
dc.description.fil
Fil: Kümmell, Susanna. University Witten/Herdecke; Alemania
dc.description.fil
Fil: Gess, Robert. Rhodes University; Sudáfrica
dc.journal.title
Journal of Vertebrate Paleontology
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.1080/02724634.2018.1491404
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/tandfonline.com/doi/abs/10.1080/02724634.2018.1491404
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