Los peces condrictios de los pisos Turoniano y Coniaciano del Valle Superior del Magdalena, sistemática y filogenia

dc.contributor.advisorPáramo Fonseca, María Eurídicespa
dc.contributor.authorOrtiz Fernández, Hernán Mauriciospa
dc.coverage.countryColombiaspa
dc.date.accessioned2025-04-24T15:23:31Z
dc.date.available2025-04-24T15:23:31Z
dc.date.issued2024
dc.descriptionilustraciones, fotografías, mapasspa
dc.description.abstractCon el propósito de ampliar el panorama del conocimiento de los taxones de condrictios preservados en rocas de los pisos Turoniano y Coniaciano del Valle Superior del Magdalena, se identificó e integró a estudios taxonómicos previos el material recolectado en campo (12 especímenes) y material de colecciones no estudiado ni publicado (tres especímenes) de las regiones de Tolima y Huila. En total se estudiaron o revisaron 26 especímenes. Los resultados de esta tesis muestran que los condrictios turonianos y coniacianos del Valle Superior del Magdalena están representados por los siguientes taxones: Ptychodus mortoni, P. decurrens, P. marginalis, P. martini, P. sp. aff. oweni, Cretodus crassidens, Cretoxyrhina mantelli, Squalicorax falcatus, S. kaupi, Carcharias amonensis, Onchosaurus pharao y Ptychotrygon cf. triangularis. También se revisó un especímen conferido previamente a Galeomorphii indet. y se identificaron dos especímenes referidos a Lamniformes indet. y uno a Squalomorphii indet. Aquí se reporta por primera vez para Colombia el hallazgo de los taxones C. mantelli, S. kaupi, C. amonensis y P. triangularis, ampliando su distribución geográfica en Sudamérica y en el mundo. Se realizó un análisis filogenético para los taxones de la familia Ptychodontidae basado en una matriz publicada de caracteres morfológicos dentales; los sclerorhynchoideos y lamniformes no ptychodóntidos no se analizaron por la naturaleza fragmentaria de los especímenes estudiados ya que no es posible identificar gran número de los caracteres morfológicos propuestos en matrices publicadas. El análisis filogenético no permitió establecer las relaciones filogenéticas de los especímenes de ptychodóntidos colombianos con sus relativos en el mundo debido a que el árbol de consenso obtenido presenta múltiples politomías. Los taxones del Turoniano y Coniaciano del Valle Superior del Magdalena también se encuentran en rocas de las mismas y otras edades del Cretácico Superior de Norteamérica y sugieren que existió una basta región marina entre los mares del norte de Sudamérica y las zonas costeras de Norteamérica; y a partir de la comparación de edades de los taxones colombianos y sus relativos en el mundo se observa que muchos de ellos fueron cosmopólitas y surge la idea de que, durante el Turoniano y Coniaciano, pudieron desplazarse entre el norte y el sur del proto-caribe. Sin embargo, es necesaria más evidencia con el fin de llegar a deducciones más concretas (Texto tomado de la fuente).spa
dc.description.abstractWith the aim of expanding the knowledge of chondrichthyan taxa preserved in rocks from the Turonian and Coniacian stages of the Upper Magdalena Valley, field-collected material (12 specimens) and previously unstudied and unpublished collection material (three specimens) from the Tolima and Huila regions were identified and integrated into prior taxonomic studies. In total, 26 specimens were studied or reviewed. The results of this thesis indicate that the Turonian and Coniacian chondrichthyans of the Upper Magdalena Valley are represented by the following taxa: Ptychodus mortoni, P. decurrens, P. marginalis, P. martini, P. sp. aff. oweni, Cretodus crassidens, Cretoxyrhina mantelli, Squalicorax falcatus, S. kaupi, Carcharias amonensis, Onchosaurus pharao, and Ptychotrygon cf. triangularis. Additionally, a specimen previously assigned to Galeomorphii indet. was reviewed, and two specimens were identified as Lamniformes indet. and one as Squalomorphii indet.. This study reports for the first time in Colombia the occurrence of the taxa C. mantelli, S. kaupi, C. amonensis, and P. triangularis, expanding their geographical distribution in South America and globally. A phylogenetic analysis of the Ptychodontidae family taxa was conducted based on a published matrix of dental morphological characters. Sclerorhynchoids and non-ptychodontid lamniforms were not analyzed due to the fragmentary nature of the studied specimens, which precluded the identification of a significant number of morphological characters proposed in published matrices. The phylogenetic analysis did not resolve the relationships of the Colombian ptychodontid specimens with their global relatives, as the resulting consensus tree displayed multiple polytomies. The Turonian and Coniacian taxa from the Upper Magdalena Valley are also present in rocks of the same and other ages of the Upper Cretaceous in North America. This suggests the existence of a vast marine region connecting the northern South American seas with the coastal areas of North America. Furthermore, the comparison of the ages of Colombian taxa with their global relatives indicates that many were cosmopolitan, which would suggest that, during the Turonian and Coniacian, these taxa could have migrated between the northern and southern proto-Caribbean. However, additional evidence is required to draw more definitive conclusions.eng
dc.description.degreelevelMaestríaspa
dc.description.degreenameMagíster en Ciencias - Geologíaspa
dc.description.researchareaPaleontología de Vertebradosspa
dc.format.extent169 páginasspa
dc.format.mimetypeapplication/pdfspa
dc.identifier.instnameUniversidad Nacional de Colombiaspa
dc.identifier.reponameRepositorio Institucional Universidad Nacional de Colombiaspa
dc.identifier.repourlhttps://repositorio.unal.edu.co/spa
dc.identifier.urihttps://repositorio.unal.edu.co/handle/unal/88111
dc.language.isospaspa
dc.publisherUniversidad Nacional de Colombiaspa
dc.publisher.branchUniversidad Nacional de Colombia - Sede Bogotáspa
dc.publisher.facultyFacultad de Cienciasspa
dc.publisher.placeBogotá, Colombiaspa
dc.publisher.programBogotá - Ciencias - Maestría en Ciencias - Geologíaspa
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dc.rights.accessrightsinfo:eu-repo/semantics/openAccessspa
dc.rights.licenseAtribución-NoComercial-SinDerivadas 4.0 Internacionalspa
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/spa
dc.subject.ddc560 - Paleontología::566 - Cordados fósilesspa
dc.subject.lembCONDRICTIOSspa
dc.subject.lembChondrichthyeseng
dc.subject.lembChimaeriformeseng
dc.subject.lembSQUALIFORMESspa
dc.subject.lembSqualiformeseng
dc.subject.lembFILOGENIAspa
dc.subject.lembPhylogenyeng
dc.subject.lembEVOLUCION (BIOLOGIA)spa
dc.subject.lembEvolution (Biology)eng
dc.subject.lembANALISIS CLADISTICOspa
dc.subject.lembCladistic analysiseng
dc.subject.lembQUIMERIFORMESspa
dc.subject.proposalCretácico Superiorspa
dc.subject.proposalUpper Cretaceouseng
dc.subject.proposalNorte de América del Surspa
dc.subject.proposalNorthern South Americaeng
dc.subject.proposalValle Superior del Magdalenaspa
dc.subject.proposalUpper Magdalena Valleyeng
dc.subject.proposalTiburonesspa
dc.subject.proposalSharkseng
dc.subject.proposalRayasspa
dc.subject.proposalRayseng
dc.subject.proposalFósilesspa
dc.subject.proposalFossilseng
dc.subject.proposalTaxonomíaspa
dc.subject.proposalTaxonomyeng
dc.titleLos peces condrictios de los pisos Turoniano y Coniaciano del Valle Superior del Magdalena, sistemática y filogeniaspa
dc.title.translatedChondrichthyan fishes from the Turonian and Coniacian stages of the Upper Magdalena Valley, sistematics and phylogenyeng
dc.typeTrabajo de grado - Maestríaspa
dc.type.coarhttp://purl.org/coar/resource_type/c_bdccspa
dc.type.coarversionhttp://purl.org/coar/version/c_ab4af688f83e57aaspa
dc.type.contentTextspa
dc.type.driverinfo:eu-repo/semantics/masterThesisspa
dc.type.redcolhttp://purl.org/redcol/resource_type/TMspa
dc.type.versioninfo:eu-repo/semantics/acceptedVersionspa
dcterms.audience.professionaldevelopmentBibliotecariosspa
dcterms.audience.professionaldevelopmentEstudiantesspa
dcterms.audience.professionaldevelopmentInvestigadoresspa
dcterms.audience.professionaldevelopmentPúblico generalspa
oaire.accessrightshttp://purl.org/coar/access_right/c_abf2spa

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