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  • Longfin Mako

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    Fin Lover

    By Fin Lover

    Taxonomy

    Longfin Mako

    Kingdom: Animalia
    Phylum: Chordata
    Class: Chondrichthyes
    Order: Lamniformes
    Family: Lamnidae
    Genus: Isurus
    Species: Isurus retroflexus
    Author Citation Agassiz, 1843

    Geological Time Scale

    Eon: Phanerozoic
    Era: Cenozoic
    Period: Neogene
    Sub Period: None
    Epoch: Pliocene

    Stratigraphy

    Goose Creek Limestone

    Provenance

    Collector: Erin Osborne
    Date Collected: 07/24/2023
    Acquired by: Field Collection

    Dimensions

    Length: 26 mm
    Width: 25 mm
    Height: 31 mm
    Thickness: 6 mm

    Location

    Berkeley County
    South Carolina
    United States

    Comments

    The Goose Creek Limestone is early-mid Pliocene and contains un-reworked Miocene-Pliocene fossils.  

     

    ID references:

    1. Gale, B. (2020). A Beachcomber's Guide to Fossils.  The University of Georgia Press.

    2. Kocsis, L. (2007). Central paratethyan shark fauna (Ipolytarnóc, Hungary). GEOLOGICA CARPATHICA-BRATISLAVA-, 58(1), 27

    3. Maisch IV, H., Becker, M., & Chamberlain Jr, J. (2015). Chondrichthyans from a lag deposit between the Shark River Formation (Middle Eocene) and Kirkwood Formation (Early Miocene), Monmouth County, New Jersey.  Paludicola, 10, 149-183.

     

    Stratigraphy information references:

    1. Boessenecker, R. (2008, May 13). The Ashley Phosphate Beds: the Reconstruction Era, Vertebrate Paleontology, Fossil Preservation, and Stratigraphic Confusion in Charleston, South Carolina. The Coastal Paleontologist. https://coastalpaleo.blogspot.com/2018/05/the-ashley-phosphate-beds.html.

    2. Campbell, M. R., & Campbell, L. D. (1995). Preliminary biostratigraphy and molluscan fauna of the Goose Creek Limestone of eastern South Carolina. Tulane Studies in Geology and Paleontology, 27(1-4).

     

    Go to fossils Sharks & Rays

    User Feedback


    sharkdoctor

    sharkdoctor

    Posted

    Are you certain this tooth isn't from Carcharias cuspidata or a related critter? Those serrate cusps are certainly intriguing.

     

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    Fin Lover

    Fin Lover

    Posted (edited)

    @sharkdoctor, I'm as sure as I can be, but I am definitely open to other opinions.  It has the distinguishing enamel ledge/shelf and is similar to other retroflexus I've found except that these cusps are serrated.  I have not come across any sand tigers here with serrated cusps, and only a couple that even have multiple (2) cusps...and they had a very different overall shape.

    Edited by Fin Lover

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    Fin Lover

    @sharkdoctor, Dave Cicimurri confirmed that this is an upper left lateral (2nd lateral) from a retroflexus.  He said that the crenulated cutting edges on the shoulders are consistent with this species.  

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    sharkdoctor

    Thanks for the follow up, @Fin Lover. If Dave says so, it's a rock solid ID :Smiling:.  I am working with Victor Perez on a project where the horizons/float we are collecting have a variety of sharks trying out serration and crenulations, cusps, etc. Unfortunately, part of the puzzle is that we have a complex stratigraphy where pre-serrate forms are mixed in with forms that are moving towards serration. Makes for a gnarly puzzle. If you ever have an excess of those retroflexus with crenulations, I'd love to do a little trading, just to have a solid example.

     

    Once we get a paper out, I'll make sure and post a copy on TFF. I suspect you may find it interesting. 

     

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    Fin Lover

    Thanks @sharkdoctor!  I don't find many retroflexus and this is the first one with crenulations, but I will let you know if I find more.

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