A new species of baenid turtle from the Early Cretaceous Lakota Formation of South Dakota

Joyce, Walter G.; Rollot, Yann; Cifelli, Richard L.

doi:10.5194/fr-23-1-2020

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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

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

RERO DOC 328437
DOI 10.5194/fr-23-1-2020

Persistent URL

https://folia.unifr.ch/unifr/documents/308489

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