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  • Pliosaurus


    Images:

    Macrophyseter

    Taxonomy

    Kingdom: Animalia
    Phylum: Chordata
    Class: Reptilia
    Order: Plesiosauria
    Family: Pliosauridae
    Genus: Pliosaurus
    Species: P. anderwsi

    Geological Time Scale

    Eon: Phanerozoic
    Era: Mesozoic
    Period: Jurassic
    Epoch: Middle
    International Age: Callovian

    Stratigraphy

    Lower Oxford Clay

    Provenance

    Date Collected: 07/28/2009
    Acquired by: Purchase/Trade

    Location

    Peterborough
    United Kingdom



    User Feedback


    On 6/7/2020 at 10:46 PM, pachy-pleuro-whatnot-odon said:

    Nice specimen!

    Agree. Looks plesiosaurian to me though (fine enamel ridges of various length)

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    pachy-pleuro-whatnot-odon

    Posted

    4 hours ago, RuMert said:

    Agree. Looks plesiosaurian to me though (fine enamel ridges of various length)

     

    Well, that's because it is a plesiosaurian tooth (sensu lato) :P

     

    I'm quite convinced this is a pliosaur tooth, though, as, in my experience, the striae on plesiosaurian (sensu stricto) teeth are typically even less pronounced; striations on teeth of the affiliated Peloneustes sp. are also not all that pronounced (see post referenced below); the striae run parallel to one another, in a more ordered fashion than what's usual for non-pliosaurid plesiosaurs; the tooth looks quite sizeable and robust; and striations do not need to run the full apicobasal length of a pliosaur tooth, nor do they need to start all at the same height (see the image from Tarlo [1960] below). In fact, when it comes to it, the teeth of Peloneustes sp. are much more like those of plesiosauromorph plesiosaurians, and less like those of short symphysis pliosaurians. With the teeth of 'Pliosaurus' andrewsi being a close match for Peloneustes, only lacking ornamentation on the labial side, I believe the identification of this tooth to likely (since we can only see the lingual side) be correct.

     

    peerj-04-1998-g008.jpg.03466509aecf45566c9aaf6cbf605c1e.jpg

     

     

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