joe asked in Science & MathematicsZoology · 1 month ago

what is the circular bone in the eyes of some fossils, like this Mosasaurus Hoffmannii?

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  • L.N.
    Lv 7
    1 month ago
    Favourite answer

    Sclerotic ring. Modern mammals don't have them, but some other modern vertebrates do including birds.

  • Anonymous
    1 month ago

    It is a ring of bone or bones that surrounds the outside of the eyeball. It is found in all birds, and in lizards but not in living mammals, crocodilians or snakes. It is found in dinosaurs, ichthyosaurs, pterosaurs and mosasaurs There is no agreement as to what the ring does, but it may keep the eye ball from changing shape because of external water or air pressure. It is most well developed in some diving birds. 

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