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Elrathia trilobite matrix A ±14mm
A sclerotic ring is a circular bone that occurs around the eyes of some vertebrates. This ring is sometimes segmented. Biologists believe that the function of this bone is to give support to the eye, especially in animals that live underwater. Paleontologists know the sclerotic ring of species such as the Ichthyosaurus, Mosasaurus and various dinosaur species. Often these bones are not preserved as a fossil.
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