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Actinopterygii, or ray-finned fishes, typically have two main openings behind the eye socket: the optic foramen, which allows the optic nerve to pass through, and the postorbital fenestra, which can vary in presence and size depending on the species. Additionally, some species may have other small foramina associated with blood vessels or nerves. Overall, the exact number can vary among different species within this diverse group.

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2d ago

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