Oldest known marine turtle? A new protostegid from the Lower Cretaceous of Colomb

Cadena, Edwin Alberto; James F. Parham

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Oldest known marine turtle? A new protostegid from the Lower Cretaceous of Colomb

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dc.creator	Cadena, Edwin Alberto	spa
dc.creator	James F. Parham	spa
dc.date.accessioned	2020-08-19T14:40:00Z
dc.date.available	2020-08-19T14:40:00Z
dc.date.created	2015	spa
dc.description.abstract	Recent studies suggested that many fossil marine turtles might not be closely related to extant marine turtles (Chelonioidea). The uncertainty surrounding the origin and phylogenetic position of fossil marine turtles impacts our understanding of turtle evolution and complicates our attempts to develop and justify fossil calibrations for molecular divergence dating. Here we present the description and phylogenetic analysis of a new fossil marine turtle from the Lower Cretaceous (upper Barremian-lower Aptian, >120 Ma) of Colombia that has a minimum age that is >25 million years older than the minimum age of the previously recognized oldest chelonioid. This new fossil taxon, Desmatochelys padillai sp. nov., is represented by a nearly complete skeleton, four additional skulls with articulated lower jaws, and two partial shells. The description of this new taxon provides an excellent opportunity to explore unresolved questions about the antiquity and content of Chelonioidea. We present an updated global character-taxon matrix that includes D. padillai and marine turtles known from relatively complete specimens. Our analysis supports D. padillai as sister taxon of D. lowi within Protostegidae, and places protostegids as the sister to Pan-Dermochelys within Chelonioidea. However, this hypothesis is complicated by discrepancies in the stratigraphic appearance of lineages as well as necessarily complicated biogeographic scenarios, so we consider the phylogeny of fossil marine turtles to be unresolved and do not recommend using D. padillai as a fossil calibration for Chelonioidea. We also explore the definition of “marine turtle,” as applied to fossil taxa, in light of many littoral or partially marine-adapted fossil and extant lineages. We conclude that whereas the term “oldest marine turtle” depends very much on the concept of the term being applied, we can confidently say that D. padillai is the oldest, definitive, fully marine turtle known to date.	eng
dc.format.mimetype	application/pdf
dc.identifier.issn	ISSN: 0031-0298
dc.identifier.issn	EISSN: 2373-8189
dc.identifier.uri	https://repository.urosario.edu.co/handle/10336/26663
dc.language.iso	eng	spa
dc.publisher	University of California Museum Of Paleontology	spa
dc.relation.citationIssue	No. 1
dc.relation.citationTitle	PaleoBios
dc.relation.citationVolume	Vol. 32
dc.relation.ispartof	PaleoBios, ISSN: 0031-0298; EISSN: 2373-8189, Vol.32, No.1 (September 2015); 44 pp.	spa
dc.relation.uri	https://escholarship.org/content/qt147611bv/qt147611bv.pdf?t=pjugq3&v=lg	spa
dc.rights.accesRights	info:eu-repo/semantics/openAccess
dc.rights.acceso	Abierto (Texto Completo)	spa
dc.source	PaleoBios	spa
dc.source.instname	instname:Universidad del Rosario
dc.source.reponame	reponame:Repositorio Institucional EdocUR
dc.subject.keyword	Marine turtle	spa
dc.subject.keyword	Padillai	spa
dc.title	Oldest known marine turtle? A new protostegid from the Lower Cretaceous of Colomb	spa
dc.title.TranslatedTitle	¿La tortuga marina más antigua conocida? Un nuevo protostegid del Cretácico Inferior de Colomb	spa
dc.type	article	eng
dc.type.hasVersion	info:eu-repo/semantics/publishedVersion
dc.type.spa	Artículo	spa