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Largest Dakosaurus specimen from England



From: Ben Creisler
bcreisler@gmail.com

A new online paper:

Mark T. Young, Lorna Steel, Martin P. Rigby, Eliza A. Howlett & Sylvia
Humphrey (2014)
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 (advance online publication)
DOI:10.1080/08912963.2014.915822
http://www.tandfonline.com/doi/full/10.1080/08912963.2014.915822#.U3YkkfldXeI


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.