Name: Cetarthrosaurus.
Phonetic: Cet-ar-fro-sore-us.
Named By: Harry Govier Seeley‭ ‬-‭ ‬1873.
Classification: Chordata,‭ ‬Reptilia,‭ ‬Ichthyosauria,‭ ‬Thunnosauria.
Species: C.‭ ‬walkeri‭ (‬type‭)‬.
Diet: Piscivore.
Size: Unknown due to lack of remains.
Known locations: England‭ ‬-‭ ‬West Melbury Marly Chalk Formation.
Time period: Albian/Cenomanian of the Cretaceous.
Fossil representation: Fragmentary post cranial remains.

       Cetarthrosaurus is a little known and often considered dubious genus of ichthyosaur that is only known from fragmentary post cranial remains.‭ ‬Still,‭ ‬Cetarthrosaurus is identified as a thunnosaurian ichthyosaur that was hunting in the waters around what would become England around the boundary of the early and late Cretaceous.‭ ‬Fossil remains of ichthyosaurs disappear from the fossil record not long after the end of the Cenomanian when an anoxic event caused a mass extinction of marine life.‭ ‬With this in mind,‭ ‬Cetarthrosaurus would have possibly been among the last ichthyosaurs to live.

Further reading
-‭ ‬On Cetarthrosaurus walkeri‭ (‬Seeley‭)‬,‭ ‬an Ichthyosaurian from the Cambridge Upper Greensand.‭ ‬-‭ ‬Quarterly Journal of the Geological Society‭ ‬29:‭ ‬505‭–‬507.‭ ‬-‭ ‬Harry Govier Seeley‭ ‬-‭ ‬1873.
-‭ ‬High Diversity in Cretaceous Ichthyosaurs from Europe Prior to Their Extinction.‭ ‬-‭ ‬PLoS ONE‭ ‬9:‭ ‬e84709.‭ ‬-‭ ‬Valentin Fischer,‭ ‬Nathalie Bardet,‭ ‬Myette Guiomar‭ & ‬Pascal Godefroit.‭ ‬-‭ ‬2014.


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