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  • Eocomatula interbrachiatus


    Images:

    TqB

    Taxonomy

    Feather star, free swimming crinoid

    Kingdom: Animalia
    Phylum: Echinodermata
    Class: Crinoidea
    Order: Isocrinida
    Family: Pentacrinitidae
    Genus: Eocomatula
    Species: E. interbrachiatus
    Author Citation (Blake, 1876)

    Geological Time Scale

    Eon: Phanerozoic
    Era: Mesozoic
    Period: Jurassic
    Sub Period: None
    Epoch: Early
    International Age: Lower Pliensbachian (top)

    Stratigraphy

    Lias
    Staithes Sandstone Formation

    Biostratigraphy

    Davoei Zone
    Figulinum Subzone?

    Provenance

    Collector: self
    Date Collected: 04/02/2013
    Acquired by: Field Collection

    Dimensions

    Length: 25 cm

    Location

    North Yorkshire Coast
    North Yorkshire
    North East
    England

    Comments

    An unusually complete specimen although crowns are well known from this location.

    It has a very short stem consisting of only six or seven columnals, all of which bear cirri. Once thought to be an early comatulid, it is now thought to belong to a separate lineage of nearly stemless pentacrinitids (Hess 2014).

    References:

    Simms, M.J. 1989. British Lower Jurassic Crinoids. Monograph of the Palaeontographical Society, London:1-103, pls.1-15 (No. 581)

    Hess, H. 2014 Origin and radiation of the comatulids (Crinoidea) in the Jurassic. Swiss J Palaeontol 133, 23–34 

    Hess 2014 Origin…comatulids 


     

    This was Invertebrate/Plant Fossil of the Month March 2015



    User Feedback


    Tidgy's Dad

    Posted

    Wonderful specimen, very special. :drool:

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