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  • Belemnite with phragmocone


    Images:

    TqB
    • The phragmocone is partly in a nodule, the rostrum protruding from it - quite rare in these beds.

      It has the remains of an epirostrum.

      Assigned to Megateuthis in Doyle 1990, The British Toarcian Belemnites.

      Contentious taxonomy down the years - diagnostic features include the pair of dorsolateral apical grooves.

      Similar specimens of Acrocoelites sp. are supposed to have an additional ventral groove but this is variable ...

    Taxonomy

    Belemnite

    Kingdom: Animalia
    Phylum: Mollusca
    Class: Cephalopoda
    Order: Belemnitida
    Family: Belemnitidae
    Genus: Megateuthis
    Species: M. glaber
    Author Citation (Simpson, 1855)

    Geological Time Scale

    Era: Mesozoic
    Period: Jurassic
    Epoch: Early
    International Age: Toarcian

    Stratigraphy

    Whitby Mudstone Formation
    Alum Shale Member

    Biostratigraphy

    Bifrons Zone
    Crassum Subzone
    Cement Shales

    Provenance

    Collector: self
    Date Collected: 04/09/2015
    Acquired by: Field Collection

    Dimensions

    Blank: 21cm

    Location

    Whitby coast
    North Yorkshire
    England

    Comments

    The phragmocone is partly in a nodule, the rostrum protruding from it - quite rare in these beds.

    It has the remains of an epirostrum.

    Assigned to Megateuthis in Doyle 1990, The British Toarcian Belemnites.

    Contentious taxonomy down the years - diagnostic features include the pair of dorsolateral apical grooves.

    Similar specimens of Acrocoelites sp. are supposed to have an additional ventral groove but this is variable ...



    User Feedback


    On 5/30/2017 at 8:59 PM, doushantuo said:

    Nice!

     

    Thank you. :) More to come (not many with phragmocones though).

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