An accumulation of turtle eggs with embryos from the Campanian (Upper Cretaceous) Judith River Formation of Montana

dc.contributor.authorLawver, Daniel R.
dc.contributor.authorJackson, Frankie D.
dc.date.accessioned2017-04-13T19:15:40Z
dc.date.available2017-04-13T19:15:40Z
dc.date.issued2017-01
dc.description.abstractA weathered accumulation of turtle eggs, interpreted as remnants of a single clutch composed of at least 16 turtle eggs (MOR 710) from the Campanian (Upper Cretaceous) Judith River Formation of north-central Montana, USA, represents a new oospecies Testudoolithus zelenitskyae. This ootaxon is diagnosed by the following unique combination of characters: spherical eggs 34–39 mm in diameter, 660–760 μm thick eggshell, shell unit height-to-width ratio of 3.15:1–5.5:1, and domed shell units. Estimated egg mass indicates that the egg-laying adult likely possessed a carapace 35.0–54.4 cm in length. Similarities between T. zelenitskyae oosp. nov. and Adocus sp. eggs, along with comparable body size, suggest that this taxon might have produced MOR 710. One egg exhibits abnormal multilayered eggshell, likely resulting from prolonged egg retention by the female turtle. At least five of these eggs, including the multilayered specimen, preserve embryonic remains that demonstrate a late stage of embryonic development. This suggests that death occurred just prior to hatching.en_US
dc.description.sponsorshipChelonian Research Foundation Linnaeus Fund; Paleontological Society Steven Jay Gould Award; The Scientific Research Societyen_US
dc.identifier.citationLawver, Daniel R, and Frankie D Jackson. "An accumulation of turtle eggs with embryos from the Campanian (Upper Cretaceous) Judith River Formation of Montana." Cretaceous Research 69 (January 2017): 90-99. DOI:https://dx.doi.org/10.1016/j.cretres.2016.08.012.en_US
dc.identifier.issn0195-6671
dc.identifier.urihttps://scholarworks.montana.edu/handle/1/12720
dc.language.isoen_USen_US
dc.rights"NOTICE: this is the author’s version of a work that was accepted for publication in Cretaceous Research. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Cretaceous Research, 69, (2017), https://dx.doi.org/10.1016/j.cretres.2016.08.012"en_US
dc.titleAn accumulation of turtle eggs with embryos from the Campanian (Upper Cretaceous) Judith River Formation of Montanaen_US
dc.typeArticleen_US
mus.citation.extentfirstpage90en_US
mus.citation.extentlastpage99en_US
mus.citation.journaltitleCretaceous Researchen_US
mus.citation.volume69en_US
mus.data.thumbpage7en_US
mus.identifier.categoryLife Sciences & Earth Sciencesen_US
mus.identifier.doihttps://dx.doi.org/10.1016/j.cretres.2016.08.012en_US
mus.relation.collegeCollege of Letters & Scienceen_US
mus.relation.departmentEarth Sciences.en_US
mus.relation.universityMontana State University - Bozemanen_US

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