Tanycolagreus
The fossil holotype  was donated to science by an anonymous benefactor. It is part of the collection of Thanksgiving Point Institute, and displayed in the North American Museum of Ancient Life at Lehi, Utah. It includes an incomplete skull and mandible (lower jaws) and much of the postcranial skeleton, i.e. the parts behind the head. The size of this specimen suggests a size in life of about 3.3 meters (11 feet) long.