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dc.contributor.advisorLieberman, Bruce
dc.contributor.authorByrum, Steven
dc.date.accessioned2020-03-16T20:45:58Z
dc.date.available2020-03-16T20:45:58Z
dc.date.issued2019-05-31
dc.date.submitted2019
dc.identifier.otherhttp://dissertations.umi.com/ku:16588
dc.identifier.urihttp://hdl.handle.net/1808/30077
dc.description.abstractMembers of the echinoid order Spatangoida, a highly diverse and abundant marine invertebrate clade, were important denizens of the Cretaceous Western Interior Seaway (WIS), an epicontinental seaway that divided North America in two during an interval of greenhouse conditions between roughly 100 and 65 million years ago. Despite being well represented in the Cretaceous rocks of Texas and surrounding areas, the phylogenetic patterns of spatangoid echinoids of the WIS, especially at the species level, have yet to be fully resolved. Further, because of their complex morphologies, they represent one of the few marine invertebrate groups from this time period that are amenable to phylogenetic study. Another interesting question pertaining to taxa found in the WIS is their biogeographic origins and whether they represent an endemic radiation or are instead derived from one or more invasions from other regions. In order to reconstruct a hypothesis of spatangoid phylogenetic relationships, a parsimony analysis was conducted using a character matrix of 32 characters collected from 20 species. Species that occur in the WIS were considered comprehensively; species from other regions such as South America, Europe, and North Africa were additionally incorporated into the analysis. Phylogenetic biogeographic analysis was then conducted on the spatangoid phylogeny using a modified version of Fitch Parsimony Analysis, and several episodes of vicariance and range expansion were identified across the phylogeny. These were possibly further related to some of the various major episodes of sea-level rise and fall during the Cretaceous.
dc.format.extent61 pages
dc.language.isoen
dc.publisherUniversity of Kansas
dc.rightsCopyright held by the author.
dc.subjectPaleontology
dc.subjectBiogeography
dc.subjectEchinoids
dc.subjectPhylogeny
dc.titlePhylogenetic and Biogeographic Analysis of Cretaceous Spatangoid Echinoids from the Western Interior Seaway
dc.typeThesis
dc.contributor.cmtememberSmith, William L
dc.contributor.cmtememberBeard, Kenneth C
dc.thesis.degreeDisciplineEcology & Evolutionary Biology
dc.thesis.degreeLevelM.A.
dc.identifier.orcidhttps://orcid.org/0000-0003-4147-7422
dc.rights.accessrightsopenAccess


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