In July 1908, Professors William Harlow Reed and A.C. Dart of the University of Wyoming, in the Alcova Quarry in Natrona County, Wyoming, uncovered the skeleton of a stegosaurian. This would be the last major excavation of a dinosaur in which Reed was personally involved. In 1914, the find was named and described as Stegosaurus longispinus by Charles Whitney Gilmore on the basis of holotype UW 20503 (originally UW D54), a partial postcranial skeleton of an adult individual consisting of forty-two vertebrae,
Gilmore diagnosed S. longispinus from other Stegosaurus species by the presence of very long dermal spikes, distal caudal vertebral centra rounded in anterior/posterior view, vestigial transverse processes on distal caudal vertebrae, and centra with mushroom-shaped dorsal extensions
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Lived: 150 million years ago - 150 million years ago
