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dc.contributor.author
Gelfo, Javier Nicolás
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dc.contributor.author
Lorente, Malena
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dc.date.available
2023-05-23T17:27:12Z
dc.date.issued
2012-01
dc.identifier.citation
Gelfo, Javier Nicolás; Lorente, Malena; The alleged astragalar remains of Didolodus Ameghino, 1897 (Mammalia, Panameriungulata) and a critic of isolated bone association models; Czech Geological Survey; Bulletin of Geosciences; 87; 2; 1-2012; 249-259
dc.identifier.issn
1214-1119
dc.identifier.uri
http://hdl.handle.net/11336/198473
dc.description.abstract
Postcranial characters of South American native ungulates are important in order to analyze their relationships in the actual therian taxonomy, particularly to test their alleged afrotherian affinities. In this sense, the most primitive and oldest South American eutherians are represented by two endemic groups of "condylarths", the Kollpaniinae and Didolodontidae. These forms, characterized by lower crowned bunodont dentition, have never been found in direct association with their postcranial remains. Even though, several skeletal elements have been assigned to some of forms, following different assumptions and criteria. Two distinct astragalar remains (MACN-CA 10737 and AMNH 117457) have been referred to the genus Didolodus, one of the most common didolodontids from early and middle Eocene Patagonian outcrops. Here we describe in detail and illustrate these materials. A critical analysis is made of several regression equation models which have been used in other cases to associate by size isolated postcranial elements to taxa defined by teeth. A new model was formulated based on 19 modern bunodont mammals with directly associated skeletons in order to test the accuracy of the regression equations. Although the results of the equation models failed to accuratly assigned the isolated astragali to any of the Didolodus species, they can be used as a good tool to disprove the association hypothesis. A broad comparison with astragalar remains of South American native ungulates indicates that MACN-CA 10737 has notoungulate affinities, in contrast AMNH 117457 resembles the astragali assigned to didolodontids from São José de Itaboraí, Brazil, according to the models criticized here. The similitude is particularly due to the broad development of the cotylar fossa, a character proposed as an afrotherian synapomorphy, but probably developed independently in different groups. Improvement in knowledge regarding postcranial characters of the earliest South American native ungulates is necessary not only due to its importance in improving accuracy of phylogenetic relationships, but also for the inferences made on paleobiological features.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Czech Geological Survey
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
ASTRAGALI
dc.subject
DIDOLODONTIDAE
dc.subject
PALEOGENE
dc.subject
REGRESSION EQUATION MODELS
dc.subject
SOUTH AMERICA
dc.subject.classification
Paleontología
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dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
The alleged astragalar remains of Didolodus Ameghino, 1897 (Mammalia, Panameriungulata) and a critic of isolated bone association models
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2023-04-18T13:17:58Z
dc.identifier.eissn
1802-8225
dc.journal.volume
87
dc.journal.number
2
dc.journal.pagination
249-259
dc.journal.pais
República Checa
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dc.journal.ciudad
Praga
dc.description.fil
Fil: Gelfo, Javier Nicolás. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Paleontología Vertebrados; Argentina
dc.description.fil
Fil: Lorente, Malena. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Paleontología Vertebrados; Argentina
dc.journal.title
Bulletin of Geosciences
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://www.geology.cz/bulletin/contents/art1301
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.3140/bull.geosci.1301
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