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A new small short-snouted dyrosaurid (crocodylomorpha, mesoeucrocodylia) from the paleocene of northeastern Colombia

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dc.creatorHastings, Alexander K.spa
dc.creatorBloch, Jonathan I.spa
dc.creatorCadena, Edwin Albertospa
dc.creatorJaramillo, Carlos A.spa
dc.date.accessioned2020-08-19T14:43:07Z
dc.date.available2020-08-19T14:43:07Z
dc.date.created2010-01-28spa
dc.description.abstractThe fossil record of dyrosaurid crocodyliforms spans the Late Cretaceous to Middle Eocene of Africa, Asia, Europe, North America, and South America. Prior to this study, specimens from South America have been limited to a few fossils with only two taxa diagnosed. We describe a nearly complete skull and unassociated mandible of a new dyrosaurid, Cerrejonisuchus improcerus gen. et sp. nov., from the Paleocene Cerrejón Formation of northeastern Colombia. The skull of C. improcerus has relatively elongate supratemporal fenestrae and well-developed occipital tuberosities, both diagnostic characteristics of Dyrosauridae. The rostrum of adult C. improcerus comprises 54–59% of the length of the skull, making it the shortest snout of any known dyrosaurid. A cladistic analysis using 82 cranial and mandibular characters for all species of Dyrosauridae known from crania yielded two most-parsimonious cladograms with C. improcerus as the sister taxon to a clade including Arambourgisuchus, Dyrosaurus, Hyposaurus, Congosaurus, Rhabdognathus, Atlantosuchus, and Guarinisuchus. Only Chenanisuchus, Sokotosuchus, and Phosphatosaurus, all known only from Africa, are more primitive within Dyrosauridae. Chenanisuchus from the Paleocene of Morocco, the only other known short-snouted dyrosaurid, is not closely related to C. improcerus and a short-snouted condition appears to have evolved independently at least twice within Dyrosauridae. Our analysis supports an African origin of Dyrosauridae with dispersals to the New World by the Late Cretaceous or earliest Paleocene. The presence of C. improcerus, together with undescribed taxa from the Cerrejón Formation, suggests a radiation of dyrosaurid crocodyliforms, possibly following the K-P boundary, in tropical South America.eng
dc.format.mimetypeapplication/pdf
dc.identifier.doihttps://doi.org/10.1080/02724630903409204
dc.identifier.issnISSN: 0272-4634
dc.identifier.issnEISSN: 1937-2809
dc.identifier.urihttps://repository.urosario.edu.co/handle/10336/27642
dc.language.isoengspa
dc.publisherSociety of Vertebrate Paleontologyspa
dc.publisherTaylor & Francis Groupspa
dc.relation.citationEndPage162
dc.relation.citationIssueNo. 1
dc.relation.citationStartPage139
dc.relation.citationTitleJournal of Vertebrate Paleontology
dc.relation.citationVolumeVol. 30
dc.relation.ispartofJournal of Vertebrate Paleontology, ISSN: 0272-4634;EISSN: 1937-2809, Vol.30, No.1 (2010); pp. 139-162 spa
dc.relation.urihttps://www.tandfonline.com/doi/pdf/10.1080/02724630903409204?needAccess=truespa
dc.rights.accesRightsinfo:eu-repo/semantics/openAccess
dc.rights.accesoAbierto (Texto Completo)spa
dc.sourceJournal of Vertebrate Paleontologyspa
dc.source.instnameinstname:Universidad del Rosario
dc.source.reponamereponame:Repositorio Institucional EdocUR
dc.subject.keywordFossilspa
dc.subject.keywordColombiaspa
dc.subject.keywordDyrosauridaespa
dc.titleA new small short-snouted dyrosaurid (crocodylomorpha, mesoeucrocodylia) from the paleocene of northeastern Colombiaspa
dc.title.TranslatedTitleUn nuevo disprosáurido pequeño de hocico corto (crocodylomorpha, mesoeucrocodylia) del paleoceno del noreste de Colombiaspa
dc.typearticleeng
dc.type.hasVersioninfo:eu-repo/semantics/publishedVersion
dc.type.spaArtículospa
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