Evidence of macrophagous teleosaurids in the Corallian Group (Oxfordian, Late Jurassic) of the UK
- Subject Areas
- Marine Biology, Paleontology, Taxonomy, Zoology
- Steneosaurus, Machimosaurus, Thalattosuchia, Corallian Gap
- © 2015 Foffa et al.
- This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ PrePrints) and either DOI or URL of the article must be cited.
- Cite this article
- 2015. Evidence of macrophagous teleosaurids in the Corallian Group (Oxfordian, Late Jurassic) of the UK. PeerJ PrePrints 3:e1349v1 https://doi.org/10.7287/peerj.preprints.1349v1
Teleosaurids were a semi-aquatic group of crocodylomorphs with a fossil record that spanned the Jurassic Period. Abundant specimens are known from Oxford Clay (OCF, Callovian to lower Oxfordian) and Kimmeridge Clay (KCF, Kimmeridgian to lower Tithonian) Formations of the UK, and contemporaneous deposits in northern France. Unfortunately, due to the paucity of material from the intermediate ‘Corallian Gap’(middle to upper Oxfordian), we lack an understanding of how and why teleosaurid taxic abundance and diversity declined from the OCF to the KCF. Our discovery of an incomplete teleosaurid lower jaw from the Corallian of Weymouth (Dorset, UK) begins to help rectify this. The vertically oriented dentition, blunt tooth apices, and intense enamel ornamentation that shifts apical to an anastomosed pattern, and deep reception pits on dentary unambiguously demonstrates the affinity of this specimen with a sub-clade of macrophagous/durophagous teleosaurids ('Steneosaurus' obtusidens + Machimosaurus>). The high symphyseal tooth count allows us to exclude the specimen from M. hugii and M. mosae, but in absence of more diagnostic material we cannot unambiguously assign the specimen to a more specific level. Nevertheless, this specimen represents the first UK mandibular material referable to Teleosauridae from this poorly known time-span.
This is an abstract that has been accepted for the 63rd Symposium for Vertebrate Palaeontology and Comparative Anatomy held in Southampton, UK September 2015. It forms part of the SPPC/SVPCA 2015 Collection.