Systematics of the soft-shelled turtles (Family Trionychidae) from the Judith River Formation (Campanian)

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dc.contributor.advisorRussell, Anthony P.
dc.contributor.authorGardner, James Douglas
dc.coverage.spatial20000076en
dc.date.accessioned2005-08-05T16:51:58Z
dc.date.available2005-08-05T16:51:58Z
dc.date.issued1992
dc.descriptionBibliography: p. 442-482.en
dc.description.abstractMany of the osteological features historically considered taxonomically and/or phylogenetically valuable for trionychids vary within, and/or continuously among, extant species. Thus, trionychid species are most reliably identified using suites of features and allowing for potentially extensive intraspecific variation. Only four of the fifteen recognized species of trionychids from the Judith River Formation (Campanian) are present in the unit. Based on diagnostic shell features, the traditional referral of these four species to Aspideretes is inappropriate. Instead, they represent two new genera: Aspideretoides gen. nov. (3 species) and Apalonoides gen. nov. (1 species). The taxonomic diversity of Judith River trionychids compares to that of extant assemblages, but it is less than that of younger North American fossil assemblages. This suggests that the apparent radiation(s) of North American fossil trionychids occurred after the Campanian and/or in an area other than that preserved as the Judith River Formation.
dc.format.extentxxiii, 497 leaves : ill. ; 30 cm.en
dc.identifier.citationGardner, J. D. (1992). Systematics of the soft-shelled turtles (Family Trionychidae) from the Judith River Formation (Campanian) (Master's thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/14763en_US
dc.identifier.doihttp://dx.doi.org/10.11575/PRISM/14763
dc.identifier.isbn0315791543en
dc.identifier.lccQE 862 C5 G37 1992en
dc.identifier.urihttp://hdl.handle.net/1880/31081
dc.language.isoeng
dc.publisher.institutionUniversity of Calgaryen
dc.publisher.placeCalgaryen
dc.rightsUniversity of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.
dc.subject.lccQE 862 C5 G37 1992en
dc.subject.lcshTurtles - Fossil
dc.subject.lcshSoft-shelled turtles
dc.subject.lcshPaleontology - Alberta
dc.subject.lcshPaleontology - Saskatchewan
dc.subject.lcshPaleontology - Montana
dc.subject.lcshPaleontology - Wyoming
dc.subject.lcshPaleontology - Colorado
dc.titleSystematics of the soft-shelled turtles (Family Trionychidae) from the Judith River Formation (Campanian)
dc.typemaster thesis
thesis.degree.disciplineBiological Sciences
thesis.degree.grantorUniversity of Calgary
thesis.degree.nameMaster of Science (MSc)
ucalgary.item.requestcopytrue
ucalgary.thesis.accessionTheses Collection 58.002:Box 820 520535244
ucalgary.thesis.notesoffsiteen
ucalgary.thesis.uarcreleaseyen
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