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dc.contributor.author
Loch, Carolina
dc.contributor.author
Buono, Mónica Romina
dc.contributor.author
Kalthoff, Daniela C.
dc.contributor.author
Mörs, Thomas
dc.contributor.author
Fernández, Marta Susana
dc.date.available
2020-11-11T15:44:05Z
dc.date.issued
2019-01
dc.identifier.citation
Loch, Carolina; Buono, Mónica Romina; Kalthoff, Daniela C.; Mörs, Thomas; Fernández, Marta Susana; Enamel Microstructure in Eocene Cetaceans from Antarctica (Archaeoceti and Mysticeti); Springer; Journal of Mammalian Evolution; 27; 2; 1-2019; 289-298
dc.identifier.issn
1064-7554
dc.identifier.uri
http://hdl.handle.net/11336/118163
dc.description.abstract
Modern baleen whales have no adult teeth, whereas dolphins and porpoises have a homodont and polydont dentition, with simplified enamel microstructure. However, archaic cetaceans (archaeocetes and early mysticetes and odontocetes) had a complex and ornamented dentition, with complex enamel microstructure as in terrestrial mammals. This study describes the morphology of teeth and enamel microstructure in two fossil cetaceans from Antarctica: a basilosaurid archaeocete from the La Meseta Formation (middle Eocene); and Llanocetus sp. from the Submeseta Formation (late Eocene), one of the oldest mysticetes known. The two teeth analyzed were lower premolars, with transversely compressed triangular crowns composed of a main cusp and accessory denticles. The enamel microstructure of the basilosaurid and Llanocetus sp. is prismatic with Hunter-Schreger bands (HSB) and an outer zone of radial enamel. In the basilosaurid, the enamel is relatively thin and measures 150–180 μm, whereas in Llanocetus sp. it is considerably thicker, measuring 830–890 μm in the cusp area and 350–380 μm near the crown base. This is one of the thickest enamel layers among cetaceans, extinct and living. Structures resembling enamel tufts and lamellae were observed in both fossils at the enamel-dentine junction (EDJ) and extending along the thickness of the enamel layer, respectively. The presence of HSB and biomechanical reinforcing structures such as tufts and lamellae suggests prominent occlusal loads during feeding, consistent with raptorial feeding habits. Despite the simplification or absence of teeth in modern cetaceans, their ancestors had complex posterior teeth typical of most mammals, with a moderately thick enamel layer with prominent HSB.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Springer
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
ARCHAEOCETES
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HUNTER-SCHREGER BANDS
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LA MESETA FORMATION
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MYSTICETES
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TEETH
dc.subject.classification
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
Enamel Microstructure in Eocene Cetaceans from Antarctica (Archaeoceti and Mysticeti)
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2020-11-05T15:36:12Z
dc.journal.volume
27
dc.journal.number
2
dc.journal.pagination
289-298
dc.journal.pais
Alemania
dc.journal.ciudad
Berlin
dc.description.fil
Fil: Loch, Carolina. University of Otago; Nueva Zelanda
dc.description.fil
Fil: Buono, Mónica Romina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico de Geología y Paleontología; Argentina
dc.description.fil
Fil: Kalthoff, Daniela C.. Swedish Museum of Natural History; Suecia
dc.description.fil
Fil: Mörs, Thomas. Swedish Museum of Natural History; Suecia
dc.description.fil
Fil: Fernández, Marta Susana. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Paleontología Vertebrados; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina
dc.journal.title
Journal of Mammalian Evolution
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://link.springer.com/10.1007/s10914-018-09456-3
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1007/s10914-018-09456-3
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