Name: Tricleidus ‭(‬Three collarbone‭)‬.
Phonetic: Tro-kly-dus.
Named By: Andrews‭ ‬-‭ ‬1909.
Classification: Chordata,‭ ‬Reptilia,‭ ‬Sauropterygia,‭ ‬Plesiosauria,‭ ‬Plesiosauroidea,‭ ‬Cryptoclididae.
Species: T.‭ ‬seeleyi‭ (‬type‭)‬.
Diet: Piscivore.
Size: Unavailable.
Known locations: England and Svalbard.
Time period: Mid Jurassic.
Fossil representation: Skull and partial post cranial remains.

       Tricleidus is but one of many cryptoclidid plesiosaurs active in European waters during the Jurassic,‭ ‬although it is not as well-known as the type genus of this‭ ‬group,‭ ‬Cryptoclidus.‭ ‬The type species name T.‭ ‬seeleyi is in honour of the British palaeontologist Harry Govier Seeley.‭ ‬Another species based upon American fossils once attributed to the genus as Tricleidus laramiensis‭ ‬(renamed from Cimoliasaurus laramiensis‭) ‬is now known as the genus Tatenectes.

Further reading
- On some new Plesiosauria from the Oxford Clay of Peterborough. - Annals And Magazine of Natural History 4:418-429. - C. W. Andrews - 1909.


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