sentences:  Its major characteristics are a large parallel-sided glabella, deep interpleural furrows on the pygidium, and slender pygidial spines, as well as the fact that it is the most common limb-bearing trilobite species in the Burgess Shale.Specimens have been found in the Marjumian of the United States (Utah and New York).General Cambrian fossils have been found in Canada (British Columbia and Newfoundland), Greenland, Kazakhstan, Russia, and the USA (Idaho, Nevada for which "O. nevadensis" is named, New York, Pennsylvania for which O. pennsylvanicus is named, Virginia, Utah, and Wyoming).