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Largest known specimen of the genus Dakosaurus (Metriorhynchidae: Geosaurini) from the Kimmeridge Clay Formation (Late Jurassic) of England, and an overview of Dakosaurus specimens discovered from this formation (including reworked specimens from the Woburn Sands Formation)

Largest known specimen of the genus Dakosaurus (Metriorhynchidae: Geosaurini) from the Kimmeridge Clay Formation (Late Jurassic) of England, and an overview of Dakosaurus specimens discovered from this formation (including reworked specimens from the Woburn Sands Formation)
Largest known specimen of the genus Dakosaurus (Metriorhynchidae: Geosaurini) from the Kimmeridge Clay Formation (Late Jurassic) of England, and an overview of Dakosaurus specimens discovered from this formation (including reworked specimens from the Woburn Sands Formation)
We report the largest known British specimen of the metriorhynchid crocodylomorph genus Dakosaurus discovered offshore from Chesil Beach, Dorset, England (Kimmeridge Clay Formation). This specimen is large toothed, which has extreme enamel spalling on the labial surface, enlarged carinae (‘carinal flanges’), carinal wear, macroziphodont denticles, and the crown retains much of its labiolingual width along most of its apicobasal length. This suite of morphologies is unique to Dakosaurus. All known Kimmeridge Clay Formation Dakosaurus specimens are isolated tooth crowns. A skull previously referred to Dakosaurus lacks all the cranial apomorphies of D. maximus and D. andiniensis, and cannot be referred to this genus. Furthermore, the vast majority of putative Dakosaurus tooth crowns from the ‘Potton Sands’ ( = Woburn Sands Formation) do indeed represent Dakosaurus (as well as two Plesiosuchus specimens), and they most likely originate from the Kimmeridge Clay Formation.
Crocodylomorpha, Dakosaurus, England, Kimmeridge Clay Formation, Metriorhynchidae, Woburn Sands Formation
0891-2963
947-953
Young, Mark T.
d9880973-1dd1-4b1c-81a8-7494170dbac2
Steel, Lorna
661f272f-fa0c-45bb-89a3-3036cc85c703
Rigby, Martin P.
b6484734-e57b-4ba8-9ad4-1be63821dc8f
Howlett, Eliza A.
e7763a3f-c367-4398-9b57-d6a34f46bc31
Humphrey, Sylvia
bdbc2be1-59f8-4896-bc16-5b35f4b4f71a
Young, Mark T.
d9880973-1dd1-4b1c-81a8-7494170dbac2
Steel, Lorna
661f272f-fa0c-45bb-89a3-3036cc85c703
Rigby, Martin P.
b6484734-e57b-4ba8-9ad4-1be63821dc8f
Howlett, Eliza A.
e7763a3f-c367-4398-9b57-d6a34f46bc31
Humphrey, Sylvia
bdbc2be1-59f8-4896-bc16-5b35f4b4f71a

Young, Mark T., Steel, Lorna, Rigby, Martin P., Howlett, Eliza A. and Humphrey, Sylvia (2015) Largest known specimen of the genus Dakosaurus (Metriorhynchidae: Geosaurini) from the Kimmeridge Clay Formation (Late Jurassic) of England, and an overview of Dakosaurus specimens discovered from this formation (including reworked specimens from the Woburn Sands Formation). Historical Biology, 27 (7), 947-953. (doi:10.1080/08912963.2014.915822).

Record type: Article

Abstract

We report the largest known British specimen of the metriorhynchid crocodylomorph genus Dakosaurus discovered offshore from Chesil Beach, Dorset, England (Kimmeridge Clay Formation). This specimen is large toothed, which has extreme enamel spalling on the labial surface, enlarged carinae (‘carinal flanges’), carinal wear, macroziphodont denticles, and the crown retains much of its labiolingual width along most of its apicobasal length. This suite of morphologies is unique to Dakosaurus. All known Kimmeridge Clay Formation Dakosaurus specimens are isolated tooth crowns. A skull previously referred to Dakosaurus lacks all the cranial apomorphies of D. maximus and D. andiniensis, and cannot be referred to this genus. Furthermore, the vast majority of putative Dakosaurus tooth crowns from the ‘Potton Sands’ ( = Woburn Sands Formation) do indeed represent Dakosaurus (as well as two Plesiosuchus specimens), and they most likely originate from the Kimmeridge Clay Formation.

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More information

Accepted/In Press date: 14 April 2014
e-pub ahead of print date: 16 May 2014
Published date: 2015
Keywords: Crocodylomorpha, Dakosaurus, England, Kimmeridge Clay Formation, Metriorhynchidae, Woburn Sands Formation
Organisations: Ocean and Earth Science

Identifiers

Local EPrints ID: 380767
URI: http://eprints.soton.ac.uk/id/eprint/380767
ISSN: 0891-2963
PURE UUID: 3684e323-ae29-42fa-a480-16419f2e2c2f

Catalogue record

Date deposited: 20 Aug 2015 11:11
Last modified: 08 Jan 2022 15:24

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Contributors

Author: Mark T. Young
Author: Lorna Steel
Author: Martin P. Rigby
Author: Eliza A. Howlett
Author: Sylvia Humphrey

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