Submitted via IRC for AndyTheAbsurd
In 2003, while excavating the enormous bones of a Supersaurus nicknamed "Jimbo," Wyoming Dinosaur Center paleontologist Bill Wahl spotted something funny. About four inches above the main bone layer, in what was thought to be fossil-free rock that could be chipped away, there lay an accumulation of tiny bones.
At first, Wyoming Dinosaur Center paleontologist Jessica Lippincott says, it seemed like the remains might belong to a flying pterosaur—a non-dinosaur reptile that lived during the same time. But further examination revealed that the bones represent something never seen before: a new species of raptor-like dinosaur, the oldest yet found in North America. "We have the smallest dinosaur and the largest dinosaur found in Wyoming, both in the same quarry," Lippincott says.
Those bones, representing a partial skeleton, were used to name the new dinosaur Hesperornithoides miessleri today in the journal PeerJ. Described by University of Wisconsin-Madison paleontologist and artist Scott Hartman and colleagues, this dinosaur is categorized as an early member of a group of svelte, small, sickle-clawed dinosaurs known to experts as troodontids. These were raptor-like dinosaurs related to the group that contains more famous carnivores like Velociraptor, as well as the forerunners of birds.
