Dimorphism in quaternary scelidotheriinae (mammalia, xenarthra, phyllophaga)

The contributions concerning possible cases of sexual dimorphisms in fossil and living sloths are scarce. Until now, studies in fossil ground sloth sexual dimorphism have been limited to the subfamilies Megatheriinae (Eremotherium) and Mylodontinae (Paramylodon) from the Pliocene and Pleistocene...

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Autores principales: Miño Boilini, Ángel Ramón, Zurita, Alfredo Eduardo
Formato: Artículo
Lenguaje:Inglés
Publicado: Coquina Press 2022
Materias:
Ground sloths
Mylodontidae
South America
Variability
Skull
Mandible
Acceso en línea:http://repositorio.unne.edu.ar/handle/123456789/30847
Aporte de:
RIUNNE - Repositorio Institucional de la Universidad Nacional del Nordeste (UNNE) de Universidad Nacional del Nordeste
id I48-R184-123456789-30847
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spelling I48-R184-123456789-308472025-03-06T11:11:56Z Dimorphism in quaternary scelidotheriinae (mammalia, xenarthra, phyllophaga) Miño Boilini, Ángel Ramón Zurita, Alfredo Eduardo Ground sloths Mylodontidae South America Variability Skull Mandible The contributions concerning possible cases of sexual dimorphisms in fossil and living sloths are scarce. Until now, studies in fossil ground sloth sexual dimorphism have been limited to the subfamilies Megatheriinae (Eremotherium) and Mylodontinae (Paramylodon) from the Pliocene and Pleistocene of South America and North America. Scelidotheriinae constitutes an endemic lineage of ground sloths from South American, with a biochron age ranging the lapse “Friasian”-Lujanian SALMAs (middle Miocene-early Holocene). An integral phylogenetic and taxonomic revision of the Qua- ternary Scelidotheriinae shows that it is possible to recognize three genera and six species: Scelidotherium Owen (Scelidotherium leptocephalum and S. bravardi), Valgipes Gervais (Valgipes bucklandi), and Catonyx Ameghino (Catonyx cuvieri, C. tarijensis, and C. chiliensis). One of the most noticeable aspects in some specimens analyzed (n= 47) was the presence of two morphtypes in each species at the level of the dorsal crests of the skull (parasagittal crests and sagittal crest) and at the level of the distal-most region of the mandible (only in C. tarijensis). In all but two species (S. leptocephalum and S. bravardi) the two types involve the absence and presence of a sagittal crest. We suggest that specimens with sagittal crest are males, and specimens lacking sagittal crest are females. This represents the third reported ground sloth clade with evidence of sexual dimorphism of the skull and mandible. 2022-02-14T12:55:45Z 2022-02-14T12:55:45Z 2015-03 Artículo Miño Boilini, Ángel R. y Zurita, Alfredo Eduardo, 2015. Dimorphism in quaternary scelidotheriinae (mammalia, xenarthra, phyllophaga). Palaeontologia Electrónica. Columbia: Coquina Press, vol. 18, no. 1, p. 1-16. ISSN 1094-8074. 1935-3952 http://repositorio.unne.edu.ar/handle/123456789/30847 eng https://doi.org/10.26879/434 openAccess http://creativecommons.org/licenses/by-nc-nd/2.5/ar/ application/pdf application/pdf Coquina Press Palaeontologia Electrónica, 2015, vol. 18, no. 1, p. 1-16.
institution Universidad Nacional del Nordeste
institution_str I-48
repository_str R-184
collection RIUNNE - Repositorio Institucional de la Universidad Nacional del Nordeste (UNNE)
language Inglés
topic Ground sloths
Mylodontidae
South America
Variability
Skull
Mandible
spellingShingle Ground sloths
Mylodontidae
South America
Variability
Skull
Mandible
Miño Boilini, Ángel Ramón
Zurita, Alfredo Eduardo
Dimorphism in quaternary scelidotheriinae (mammalia, xenarthra, phyllophaga)
topic_facet Ground sloths
Mylodontidae
South America
Variability
Skull
Mandible
description The contributions concerning possible cases of sexual dimorphisms in fossil and living sloths are scarce. Until now, studies in fossil ground sloth sexual dimorphism have been limited to the subfamilies Megatheriinae (Eremotherium) and Mylodontinae (Paramylodon) from the Pliocene and Pleistocene of South America and North America. Scelidotheriinae constitutes an endemic lineage of ground sloths from South American, with a biochron age ranging the lapse “Friasian”-Lujanian SALMAs (middle Miocene-early Holocene). An integral phylogenetic and taxonomic revision of the Qua- ternary Scelidotheriinae shows that it is possible to recognize three genera and six species: Scelidotherium Owen (Scelidotherium leptocephalum and S. bravardi), Valgipes Gervais (Valgipes bucklandi), and Catonyx Ameghino (Catonyx cuvieri, C. tarijensis, and C. chiliensis). One of the most noticeable aspects in some specimens analyzed (n= 47) was the presence of two morphtypes in each species at the level of the dorsal crests of the skull (parasagittal crests and sagittal crest) and at the level of the distal-most region of the mandible (only in C. tarijensis). In all but two species (S. leptocephalum and S. bravardi) the two types involve the absence and presence of a sagittal crest. We suggest that specimens with sagittal crest are males, and specimens lacking sagittal crest are females. This represents the third reported ground sloth clade with evidence of sexual dimorphism of the skull and mandible.
format Artículo
author Miño Boilini, Ángel Ramón
Zurita, Alfredo Eduardo
author_facet Miño Boilini, Ángel Ramón
Zurita, Alfredo Eduardo
author_sort Miño Boilini, Ángel Ramón
title Dimorphism in quaternary scelidotheriinae (mammalia, xenarthra, phyllophaga)
title_short Dimorphism in quaternary scelidotheriinae (mammalia, xenarthra, phyllophaga)
title_full Dimorphism in quaternary scelidotheriinae (mammalia, xenarthra, phyllophaga)
title_fullStr Dimorphism in quaternary scelidotheriinae (mammalia, xenarthra, phyllophaga)
title_full_unstemmed Dimorphism in quaternary scelidotheriinae (mammalia, xenarthra, phyllophaga)
title_sort dimorphism in quaternary scelidotheriinae (mammalia, xenarthra, phyllophaga)
publisher Coquina Press
publishDate 2022
url http://repositorio.unne.edu.ar/handle/123456789/30847
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AT zuritaalfredoeduardo dimorphisminquaternaryscelidotheriinaemammaliaxenarthraphyllophaga
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