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  • Megalichthys

    Images:

    Paul1719

    By Paul1719

    Taxonomy

    Megalichthys

    Kingdom: Animalia
    Phylum: Chordata
    Class: Osteichthyes
    Order: Osteolepiformes
    Family: Megalichthyidae
    Genus: Megalichthys
    Species: Megalichthys mullisoni
    Author Citation Downs, J. P., and E. B. Daeschler. 2020. A new species of Megalichthys (Sarcopterygii, Megalichthyidae) from the Upper Devonian (Famennian) of Pennsylvania, U.S.A., and a report on the cosmine-covered osteolepiform fossils of the Catskill Formation. Journal of Vertebrate Paleontology. DOI: 10.1080/02724634.2020.1774771.

    Geological Time Scale

    Eon: Phanerozoic
    Era: Paleozoic
    Period: Devonian
    Sub Period: None
    Epoch: Late
    International Age: Famennian

    Stratigraphy

    Catskill Formation

    Provenance

    Collector: Paul and Ian Bourdon
    Date Collected: 06/17/2023
    Acquired by: Field Collection

    Location

    Red Hill
    Clinton
    Pennsylvania
    United States

    Comments

    All material was found in a lag deposit layer on SW side of highway Rt120.

     

    SYSTEMATIC PALEONTOLOGY

    SARCOPTERYGII Romer, 1955

    TETRAPODOMORPHA Ahlberg, 1991

    MEGALICHTHYIDAE Hay, 1902

    Diagnosis—Osteolepiform distinguished by a cosmine cover to

    dermal bones in combination with a premaxillary tusk that interrupts

    or lies lingual to the premaxillary marginal tooth row,

    contact between the subopercular and the second submandibular

    bones, and a distinct rostral process of the supratemporal that is

    without cosmine cover (Borgen and Nakrem, 2016).

    Diagnosis—A species of Megalichthys that is distinguished

    from previously described species by the presence of a pineal

    series of bones, the presence of a triangular principal gular, and

    the lack of sensory canal pores on the postparietal.

    image.thumb.png.ac91b88a6fea45f07b4f068a997b748c.png

     

    image.thumb.png.b1c05410cd90e6ff83dc3812001fca2e.png

    Go to fossils Fishes

    User Feedback


    Paul1719

    I should have annotated/captioned all the images, ugh! Top row. First three are parietal shields, fig1. anterior is up, parietals and pineal series (between) bottom. fig 2/3 snout with parietals at top. Megalichthys retains the primitive condition and resembles Psarolepis. fig4. Principle gular. fig5. maxilla. fig6. cleithrum fragment, dermal surface. fig7. clavicle. fig8. midline scale.

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