Jump to content

  • Asaphus expansus gracilis

    Images:

    Kane

    By Kane

    Taxonomy

    Asaphus expansus gracilis

    Kingdom: Animalia
    Phylum: Arthropoda
    Class: Trilobita
    Order: Asaphida
    Family: Asaphidae
    Genus: Asaphus
    Species: Asaphus expansus
    Author Citation Ivantsov, 2003

    Geological Time Scale

    Eon: Phanerozoic
    Era: Paleozoic
    Period: Ordovician
    Sub Period: None
    Epoch: Early

    Stratigraphy

    Aseri Stage

    Biostratigraphy

    Asaphus expansus zone
    Kunda Horizon

    Provenance

    Date Collected: 03/27/2018
    Acquired by: Purchase/Trade

    Dimensions

    Length: 67 mm
    Width: 44 mm

    Location

    Voibokalo Quarry
    St Petersburg
    Russia

    Comments

    The full name is Asaphus expansus gracilis

    Go to fossils Trilobites

    User Feedback


    Tidgy's Dad

    Tidgy's Dad

    Posted

    You do have an ever-growing, impressive and beautiful collection of trilobites. 

    This is beautiful. :trilo::)

    Share this comment

    Link to comment
    Share on other sites
    Kane

    Thanks, Adam. :) One of the features I find kind of neat is the very tiny tubercle at the base of the cephalon. Seems kind of vestigial in terms of any purpose. 

    Share this comment

    Link to comment
    Share on other sites
    piranha
    15 hours ago, Kane said:

    One of the features I find kind of neat is the very tiny tubercle at the base of the cephalon. Seems kind of vestigial in terms of any purpose. 

     

     

    You will enjoy these papers:

     

    Lerosey-Aubril, R., & McNamara, K.J. 2008
    The cephalic median organ of trilobites.

    Cuadernos del Museo Geominero, 9:229-235

     

    Barrientos, Y,. & Laverack, M.S. 1986
    The larval crustacean dorsal organ and its relationship to the trilobite median tubercle. 
    Lethaia, 19(4):309-313

     

    Fortey, R.A., & Clarkson, E.N.K. 1976
    The function of the glabellar 'tubercle' in Nileus and other trilobites. 
    Lethaia, 9(1):101-106 

     

    Ruedemann, R. 1916
    The presence of a median eye in trilobites.

    Bulletin of the New York State Museum, 189:127-143

    Share this comment

    Link to comment
    Share on other sites


    Create an account or sign in to comment

    You need to be a member in order to leave a comment

    Create an account

    Sign up for a new account in our community. It's easy!

    Register a new account

    Sign in

    Already have an account? Sign in here.

    Sign In Now

×
×
  • Create New...