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dc.contributor.author
O'Keefe, F. Robin
dc.contributor.author
Otero, Rodrigo A.
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Soto-Acuña, Sergio
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O'gorman, Jose Patricio
dc.contributor.author
Godfrey, Stephen J.
dc.contributor.author
Chatterjee, Sankar
dc.date.available
2019-04-29T19:14:49Z
dc.date.issued
2017-07
dc.identifier.citation
O'Keefe, F. Robin; Otero, Rodrigo A.; Soto-Acuña, Sergio; O'gorman, Jose Patricio; Godfrey, Stephen J.; et al.; Cranial anatomy of Morturneria seymourensis from Antarctica, and the evolution of filter feeding in plesiosaurs of the Austral Late Cretaceous; Society of Vertebrate Paleontology; Journal of Vertebrate Paleontology; 37; 4; 7-2017
dc.identifier.issn
0272-4634
dc.identifier.uri
http://hdl.handle.net/11336/75235
dc.description.abstract
This paper redescribes the holotype skull of the aristonectine elasmosaur Morturneria seymourensis from the upper Maastrichtian of Seymour Island, Antarctica. This description supports the validity of the genus Morturneria, distinct from the genus Aristonectes from Chile and Argentina. The paroccipital process of Morturneria is plesiomorphic, similar to Alexandronectes and unlike the autapomorphic occiput of Aristonectes. The palate of Morturneria is autapomorphic in possessing a strongly developed midline keel. The cranium of Morturneria is about 60% complete and preserves the anterior skull roof and palate; both regions were previously unknown in any aristonectine. The combination of the Morturneria holotype and recent research on other aristonectines allows the first confident cranial reconstruction of an aristonectine elasmosaur. The cranial anatomy of both Morturneria and its close relatives is derived relative to all other plesiosaurs, possessing a novel suite of dental and oral cavity adaptions. The suspensorium extends far behind the occipital condyle, and the jaw is long and hoop-like; together these features allowed a large gape and oral cavity volume. The palate of Morturneria is strongly keeled, forming arched lateral oral chambers that further increased oral cavity volume. The dentition of Morturneria is similar to that of Aristonectes, and all share autapomorphic interlocking combs of needle-like teeth that occluded outside the mouth and did not meet tip to tip. The upper and lower dentition formed an oral battery that may have functioned like a sieve in straining food particles from substrate ejected from the oral cavity. We theorize that this highly derived suite of adaptations is convergent with extant gray whales and archaic mysticetes and hypothesize that it functioned similarly in sieve feeding following suction. This is the first identification of whale-like filter feeding in any marine reptile, a condition once claimed to be anatomically impossible. Citation for this article: O'Keefe, F. R., R. A. Otero, S. Soto-Acuña, J. P. O'Gorman, S. J. Godfrey, and S. Chatterjee. 2017. Cranial anatomy of Morturneria seymourensis from Antarctica, and the evolution of filter feeding in plesiosaurs of the Austral Late Cretaceous. Journal of Vertebrate Paleontology. DOI: 10.1080/02724634.2017.1347570.
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
Elamosauridae
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Morturneria Seymourensis
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Aristonectinae
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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
Cranial anatomy of Morturneria seymourensis from Antarctica, and the evolution of filter feeding in plesiosaurs of the Austral Late Cretaceous
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2019-04-26T18:27:08Z
dc.journal.volume
37
dc.journal.number
4
dc.journal.pais
Estados Unidos
dc.journal.ciudad
Lawrence
dc.description.fil
Fil: O'Keefe, F. Robin. Marshall University; Estados Unidos
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Fil: Otero, Rodrigo A.. Universidad de Chile; Chile
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Fil: Soto-Acuña, Sergio. Museo Nacional de Historia Natural Chile; Chile
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Fil: O'gorman, Jose Patricio. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Paleontología Vertebrados; Argentina
dc.description.fil
Fil: Godfrey, Stephen J.. Calvert Marine Museum; Estados Unidos
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Fil: Chatterjee, Sankar. Museum of Texas Tech University; Estados Unidos
dc.journal.title
Journal of Vertebrate Paleontology
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1080/02724634.2017.1347570
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.tandfonline.com/doi/full/10.1080/02724634.2017.1347570
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