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  • Periarchus sp.


    Images:

    sixgill pete

    Taxonomy

    Sand Dollar

    Kingdom: Animalia
    Phylum: Echinodermata
    Class: Echinoidea
    Order: Clypeasteroida
    Family: Protoscutellidae
    Genus: Periarchus
    Species: P. sp.
    Author Citation Conrad, 1866

    Geological Time Scale

    Eon: Phanerozoic
    Era: Cenozoic
    Period: Paleogene
    Epoch: Eocene
    Age: Bartonian

    Stratigraphy

    Castle Hayne Formation

    Provenance

    Collector: Don Rideout
    Date Collected: 03/18/2016
    Acquired by: Field Collection

    Dimensions

    Length: 30mm
    Width: 28.2mm
    Thickness: 5.1mm

    Location

    Martin Marietta Quarry
    Onslow County
    North Carilina
    United States

    Comments

    Periarchus sp. is found in Zullo & Harris (1987) sequence 3 of the Castle Hayne Formation ( Kier, (1980) middle biozone). It is differentiated from Periarchus lyelli only by the placement of the periproct. In P. sp the periproct is below the midpoint between the peristome and the posterior margin of the test. On P. lyelli it is slightly above. Kier (1980), identified this sand dollar as Protoscutella plana; however Osborne, Mooi and Ciampaglio (2013) determined the oral plate structure separate these specimens from Protescutella plana and belonged in the Genus Periarchus. 



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