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dc.contributor.authorPrieto-Marquez, Albert ( )
dc.contributor.authorWagner, Jonathan ( )
dc.date.accessioned2021-08-09T14:28:40Z
dc.date.available2021-08-09T14:28:40Z
dc.date.issued2013-11-22
dc.identifier.citationPrieto-Márquez, A., & Wagner, J. R. (2013). The ‘unicorn’ dinosaur that wasn’t: A new reconstruction of the crest of Tsintaosaurus and the early evolution of the lambeosaurine crest and rostrum. PLoS One, 8(11), e82268.en_US
dc.identifier.issn1932-6203
dc.identifier.urihttps://digital.library.txstate.edu/handle/10877/14242
dc.description.abstractThe lambeosaurine Tsintaosaurus spinorhinus has traditionally been reconstructed with an elevated, hollow, spike-like crest composed entirely of the nasal bones, although this has been disputed. Here, we provide a new reconstruction of the skull of this species based on reexamination and reinterpretation of the morphology and articular relationships of the type and Paratype skulls and a fragmentary crest. We confirm the presence of a supracranial crest composed of the elevated nasal bones, but also including the premaxillae. We hypothesize that the crest is a tall, lobate, hollow structure that projects dorsally and slightly caudally a distance greater than the height of the skull along the quadrate. In our reconstruction, the nasal passage passes through the crest, but enters the skull rostral to the tubular process of the nasals, not through it. Tsintaosaurus spinorhinus is rediagnosed on the basis of a suite of cranial autapomorphies including a circumnarial fossa subdivided into three accessory fossae, prefrontal with ascending rostral process and lateral flange, nasals fused sagittally to form elongate tubular process that rises dorsally from skull roof, each nasal being expanded rostrocaudally into a rhomboid distal process, and medial processes of premaxillae at the summit of the cranial crest inserted between rhomboid processes of nasals. Tsintaosaurus spinorhinus lacks characters that are present in more derived lambeosaurines (parasaurolophins and lambeosaurins), such as rotation of the caudal margin of the crest to an acute angle with the skull roof, lateral processes of the nasals that enclose part of the intracranial cavity and participate in the formation of the walls of the common median chamber, and a smooth narial fossa lacking ridges and accessory fossae. We hypothesize that ancestrally the rostrum of lambeosaurines may have been more similar to that in Saurolophinae, and became subsequently reduced in complexity during evolution of the group.en_US
dc.formatText
dc.format.extent20 pages
dc.format.medium1 file (.pdf)
dc.language.isoenen_US
dc.publisherPublic Library of Scienceen_US
dc.sourcePLoS One, 2013, Vol. 8, No. 11, Article e82268.
dc.subjectSkullen_US
dc.subjectNasal passagesen_US
dc.subjectOrnithischiaen_US
dc.subjectCraniumen_US
dc.subjectPhylogeneticsen_US
dc.subjectFaceen_US
dc.subjectPaleogeneticsen_US
dc.subjectMaxillaen_US
dc.titleThe ‘Unicorn’ Dinosaur That Wasn’t: A New Reconstruction of the Crest of Tsintaosaurus and the Early Evolution of the Lambeosaurine Crest and Rostrumen_US
dc.typepublishedVersion
txstate.documenttypeArticle
dc.rights.holder© 2013 Prieto-Márquez, Wagner.
dc.identifier.doihttps://doi.org/10.1371/journal.pone.0082268
dc.rights.licenseCreative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.
dc.description.departmentGeography


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