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Evidence for the teleosaurid crocodylomorph genus Machimosaurusin the Kimmeridge Clay Formation (Late Jurassic) of England

Evidence for the teleosaurid crocodylomorph genus Machimosaurusin the Kimmeridge Clay Formation (Late Jurassic) of England
Evidence for the teleosaurid crocodylomorph genus Machimosaurusin the Kimmeridge Clay Formation (Late Jurassic) of England
We report the only definite specimen of the teleosaurid crocodylomorph genus Machimosaurus from the Kimmeridge Clay Formation of England. This specimen (an isolated tooth) is now the only evidence of Machimosaurus in the Kimmeridge Clay Formation because a large skull and mandible, previously considered to be of Machimosaurus mosae, was recently shown to pertain to a metriorhynchid crocodylomorph. The tooth described herein was originally figured in 1884 as a tooth crown from a metriorhynchid crocodylomorph. However, its conical shape, blunt apex and distinctive enamel ornamentation are characteristic of the teleosaurid genus Machimosaurus. That Machimosaurus, and teleosaurids in general, were so rare in the Kimmeridge Clay Formation suggests that these marine crocodylomorphs did not commonly use this seaway. Their rarity is in contrast to contemporaneous deposits from continental Europe where teleosaurid remains, including Machimosaurus, are far more common. These continental deposits were deposited in shallow-marine/brackish ecosystems, suggesting that teleosaurids were largely restricted to coastal marine environments.
0891-2963
472-479
Young, Mark T.
d9880973-1dd1-4b1c-81a8-7494170dbac2
Steel, Lorna
661f272f-fa0c-45bb-89a3-3036cc85c703
Young, Mark T.
d9880973-1dd1-4b1c-81a8-7494170dbac2
Steel, Lorna
661f272f-fa0c-45bb-89a3-3036cc85c703

Young, Mark T. and Steel, Lorna (2014) Evidence for the teleosaurid crocodylomorph genus Machimosaurusin the Kimmeridge Clay Formation (Late Jurassic) of England. Historical Biology, 26 (4), 472-479. (doi:10.1080/08912963.2013.793320).

Record type: Article

Abstract

We report the only definite specimen of the teleosaurid crocodylomorph genus Machimosaurus from the Kimmeridge Clay Formation of England. This specimen (an isolated tooth) is now the only evidence of Machimosaurus in the Kimmeridge Clay Formation because a large skull and mandible, previously considered to be of Machimosaurus mosae, was recently shown to pertain to a metriorhynchid crocodylomorph. The tooth described herein was originally figured in 1884 as a tooth crown from a metriorhynchid crocodylomorph. However, its conical shape, blunt apex and distinctive enamel ornamentation are characteristic of the teleosaurid genus Machimosaurus. That Machimosaurus, and teleosaurids in general, were so rare in the Kimmeridge Clay Formation suggests that these marine crocodylomorphs did not commonly use this seaway. Their rarity is in contrast to contemporaneous deposits from continental Europe where teleosaurid remains, including Machimosaurus, are far more common. These continental deposits were deposited in shallow-marine/brackish ecosystems, suggesting that teleosaurids were largely restricted to coastal marine environments.

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Published date: August 2014
Organisations: Ocean and Earth Science

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Local EPrints ID: 367439
URI: http://eprints.soton.ac.uk/id/eprint/367439
ISSN: 0891-2963
PURE UUID: 25187d8d-e9cf-4eec-ad9c-a4a9d5cc3e5c

Catalogue record

Date deposited: 30 Jul 2014 09:27
Last modified: 16 Jul 2019 20:59

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