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

ecent 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 develo...

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Tipo de recurso:
Fecha de publicación:
2017
Institución:
Universidad del Rosario
Repositorio:
Repositorio EdocUR - U. Rosario
Idioma:
eng
OAI Identifier:
oai:repository.urosario.edu.co:10336/26664
Acceso en línea:
https://repository.urosario.edu.co/handle/10336/26664
Palabra clave:
Testudines
South America
Sea turtles
Villa de Leyva
Upper Barremian-lower Aptian
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License
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oai_identifier_str oai:repository.urosario.edu.co:10336/26664
network_acronym_str EDOCUR2
network_name_str Repositorio EdocUR - U. Rosario
repository_id_str
spelling 882350066006879b972-e531-416f-a9d5-ddca1962385a-12020-08-19T14:40:00Z2020-08-19T14:40:00Z2017-09-07ecent 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.application/pdfISSN: 0031-0298https://repository.urosario.edu.co/handle/10336/26664engUniversity of California Museum of PaleontologyNo. 1PaleoBiosVol. 32PaleoBios, ISSN: 0031-0298, Vol.32, No.1 (2017)https://escholarship.org/uc/item/147611bvAbierto (Texto Completo)http://purl.org/coar/access_right/c_abf2PaleoBiosinstname:Universidad del Rosarioreponame:Repositorio Institucional EdocURTestudinesSouth AmericaSea turtlesVilla de LeyvaUpper Barremian-lower AptianOldest known marine turtle?: A new protostegid from the Lower Cretaceous of Colombia¿La tortuga marina más antigua conocida ?: Un nuevo protostegid del Cretácico Inferior de ColombiaarticleArtículohttp://purl.org/coar/version/c_970fb48d4fbd8a85http://purl.org/coar/resource_type/c_6501Cadena, Edwin AlbertoParham, James10336/26664oai:repository.urosario.edu.co:10336/266642021-06-03 00:49:57.123https://repository.urosario.edu.coRepositorio institucional EdocURedocur@urosario.edu.co
dc.title.spa.fl_str_mv Oldest known marine turtle?: A new protostegid from the Lower Cretaceous of Colombia
dc.title.TranslatedTitle.spa.fl_str_mv ¿La tortuga marina más antigua conocida ?: Un nuevo protostegid del Cretácico Inferior de Colombia
title Oldest known marine turtle?: A new protostegid from the Lower Cretaceous of Colombia
spellingShingle Oldest known marine turtle?: A new protostegid from the Lower Cretaceous of Colombia
Testudines
South America
Sea turtles
Villa de Leyva
Upper Barremian-lower Aptian
title_short Oldest known marine turtle?: A new protostegid from the Lower Cretaceous of Colombia
title_full Oldest known marine turtle?: A new protostegid from the Lower Cretaceous of Colombia
title_fullStr Oldest known marine turtle?: A new protostegid from the Lower Cretaceous of Colombia
title_full_unstemmed Oldest known marine turtle?: A new protostegid from the Lower Cretaceous of Colombia
title_sort Oldest known marine turtle?: A new protostegid from the Lower Cretaceous of Colombia
dc.subject.keyword.spa.fl_str_mv Testudines
South America
Sea turtles
Villa de Leyva
Upper Barremian-lower Aptian
topic Testudines
South America
Sea turtles
Villa de Leyva
Upper Barremian-lower Aptian
description ecent 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.
publishDate 2017
dc.date.created.spa.fl_str_mv 2017-09-07
dc.date.accessioned.none.fl_str_mv 2020-08-19T14:40:00Z
dc.date.available.none.fl_str_mv 2020-08-19T14:40:00Z
dc.type.eng.fl_str_mv article
dc.type.coarversion.fl_str_mv http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.coar.fl_str_mv http://purl.org/coar/resource_type/c_6501
dc.type.spa.spa.fl_str_mv Artículo
dc.identifier.issn.none.fl_str_mv ISSN: 0031-0298
dc.identifier.uri.none.fl_str_mv https://repository.urosario.edu.co/handle/10336/26664
identifier_str_mv ISSN: 0031-0298
url https://repository.urosario.edu.co/handle/10336/26664
dc.language.iso.spa.fl_str_mv eng
language eng
dc.relation.citationIssue.none.fl_str_mv No. 1
dc.relation.citationTitle.none.fl_str_mv PaleoBios
dc.relation.citationVolume.none.fl_str_mv Vol. 32
dc.relation.ispartof.spa.fl_str_mv PaleoBios, ISSN: 0031-0298, Vol.32, No.1 (2017)
dc.relation.uri.spa.fl_str_mv https://escholarship.org/uc/item/147611bv
dc.rights.coar.fl_str_mv http://purl.org/coar/access_right/c_abf2
dc.rights.acceso.spa.fl_str_mv Abierto (Texto Completo)
rights_invalid_str_mv Abierto (Texto Completo)
http://purl.org/coar/access_right/c_abf2
dc.format.mimetype.none.fl_str_mv application/pdf
dc.publisher.spa.fl_str_mv University of California Museum of Paleontology
dc.source.spa.fl_str_mv PaleoBios
institution Universidad del Rosario
dc.source.instname.none.fl_str_mv instname:Universidad del Rosario
dc.source.reponame.none.fl_str_mv reponame:Repositorio Institucional EdocUR
repository.name.fl_str_mv Repositorio institucional EdocUR
repository.mail.fl_str_mv edocur@urosario.edu.co
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