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Alienochelys ("strange turtle") is an extinct genus of sea turtle known from Maastrichian-aged Cretaceous phosphates in Morocco.[1] Its name comes from the fact that unlike other sea turtles, Alienochelys' jaws are adapted for a powerful crushing pattern, as well as its unusual cranial characteristics.[2] It is a relative of the modern leatherback turtle, as well as the extinct Archelon.

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