An accumulation of turtle eggs with embryos from the Campanian (Upper Cretaceous) Judith River Formation of Montana |
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| Institution: | 1. School of Earth and Environmental Sciences, Seoul National University, Seoul 08826, South Korea;2. Petroleum and Marine Research Division, Korea Institute of Geosciences and Mineral Resources, 305-350, 124 Gwahang-no Yuseong-gu, Daejeon, South Korea;3. Department of Geology, Kyungpook National University, Daegu 41566, Korea, South Korea |
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| Abstract: | A 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. |
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| Keywords: | Testudoolithidae Testudines Cryptodira Ootaxonomy Multilayered egg |
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