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Associated remains found with this skeleton consist of acid - etched vertebrae and a fragmentary dentary from juvenile hadrosaur dinosaurs.
Even at first glance, the shape of the four-inch-long bone and the linear arrangement of tooth sockets told us that this was a dentary , or tooth-bearing portion of a lower jaw.
Mammals are unique among extant vertebrates in possessing a lower jaw formed by a single bony element, the dentary .
This tusk may be associated with the left dentary of the old animal.
During mammalian evolution, the lower jaw became just one bone, the dentary , with the articular no longer attached to the lower jaw.
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