What is "alienochelys"

Alienochelys ("strange turtle") is an extinct species of sea turtle known from Maastrichian-aged Cretaceous phosphates in Morocco. 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. It is a relative of the modern leatherback turtle, as well as the extinct Archelon.