This marine reptiles is one of the most well known of all marine reptiles.
Reminder: hide your answer behind a CW. This will allow others to guess without a hint. I will post the answer tomorrow (and to anyone who guesses correctly).
@TheDinosaurDave
for a while the wide flat body had me thinking of Placodus, but then I realized those were meant to be four flippers, not a wide flat body, and I saw the neck.
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