A new species of baenid turtle from the Early Cretaceous Lakota Formation of South Dakota
- Joyce, Walter G. Department of Geosciences, University of Fribourg, 1700 Fribourg, Switzerland
- Rollot, Yann Department of Geosciences, University of Fribourg, 1700 Fribourg, Switzerland
- Cifelli, Richard L. Oklahoma Museum of Natural History, Norman, OK 73072, USA
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12.02.2020
Published in:
- Fossil Record. - 2020, vol. 23, no. 1, p. 1–13
English
Baenidae is a clade of paracryptodiran turtles known from the late Early Cretaceous to Eocene of North America. The proposed sister-group relationship of Baenidae to Pleurosternidae, a group of turtles known from sediments dated as early as the Late Jurassic, suggests a ghost lineage that crosses the early Early Cretaceous. We here document a new species of paracryptodiran turtle, Lakotemys australodakotensis gen. and sp. nov., from the Early Cretaceous (Berriasian to Valanginian) Lakota Formation of South Dakota based on a poorly preserved skull and two partial shells. Lakotemys australodakotensis is most readily distinguished from all other named Late Jurassic to Early Cretaceous paracryptodires by having a broad, baenid-like skull with expanded triturating surfaces and a finely textured shell with a large suprapygal I that laterally contacts peripheral X and XI and an irregularly shaped vertebral V that does not lap onto neural VIII and that forms two anterolateral processes that partially separate the vertebral IV from contacting pleural IV. A phylogenetic analysis suggests that Lakotemys australodakotensis is a baenid, thereby partially closing the previously noted gap in the fossil record.
- Faculty
- Faculté des sciences et de médecine
- Department
- Département de Géosciences
- Language
-
- English
- Classification
- Palaeontology
- License
- License undefined
- Identifiers
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- RERO DOC 328437
- DOI 10.5194/fr-23-1-2020
- Persistent URL
- https://folia.unifr.ch/unifr/documents/308489
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