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Paromomyidae (order Primates, suborder Plesiadapiformes) An extinct family that comprises the earliest known primates, which may have originated during the late Cretaceous (when they were contemporaries of dinosaurs). They flourished in the Palaeocene, and died out in the middle Eocene. Most are known only from their teeth, but increasing numbers of skulls and limb bones are now known. Probably they were the size of modern shrews, herbivorous, and lived on or close to the ground.