Name: Peloneustes ‭(‬Mud swimmer‭)‬.
Phonetic: Pel-o-new-steez.
Named By: Lydekker‭ ‬-‭ ‬1889.
Classification: Chordata,‭ ‬Reptilia,‭ ‬Sauropterygia,‭ ‬Plesiosauria,‭ ‬Plesiosaroidea,‭ ‬Pliosauridae.
Species: P.‭ ‬philarchus‭ (‬type‭)‬.
Diet: Possibly shellfish and cephalopods.
Size: Around‭ ‬3‭ ‬meters long.
Known locations: England.
Time period: Callovian of the Jurassic.
Fossil representation: Many specimens.

       A relatively small and unassuming pliosaur,‭ ‬Peloneustes shows a dental specialisation where the teeth were not as sharp as other presumably piscivorous‭ (‬fish eating‭) ‬marine reptiles.‭ ‬The blunter teeth would have instead been better suited for cracking the shells of cephalopods like belemnites and ammonites so that Peloneustes could easily eat the soft bodied mollusc within.‭ ‬Although long associated with English fossil deposits,‭ ‬Peloneustes likely had a broader range since it was capable of traveling across the open ocean.

Further reading
- On the remains and affinities of five genera of Mesozoic reptiles. - Quarterly Journal of the Geological Society of London 45:41-59. - R. Lydekker - 1889.
- Notes sur le Peloneustes philarchus Seeley du musée paléontologique de Lausanne. - Bulletin de la Société Vaudoise des Sciences Naturelles. 43 (160): 395–398. - F. Jaccard - 1907.
- The cranial anatomy and taxonomy of Peloneustes philarchus (Sauropterygia, Pliosauridae) from the Peterborough member (Callovian, Middle Jurassic) of the United Kingdom. - Palaeontology. 54 (3): 639–665. - H. F. Ketchum & R. B. J. Benson - 2011.


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