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Sclerotic rings are rings of bone found in the eyes of several groups of vertebrate animals, except for mammals and crocodilians.[2] They can be made up of single bones or multiple segments.[3] They are believed to have a role in supporting the eye, especially in animals whose eyes are not spherical, or which live underwater.[2] Fossil sclerotic rings are known for a variety of extinct animals, including ichthyosaurs, pterosaurs, and dinosaurs,[4] but are often not preserved.

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