Dorypygidae

Olenoides is a genus of trilobite from the Cambrian period. Its fossils can be found with soft body parts intact in the Burgess Shale in Canada. Fossils of this genus can also be found in the Wheeler Shale and Marjum Formation of Utah in the United States of America, among other localities. Species within this genus range in size, with most being medium-sized trilobites (Olenoides Serratus from the Burgess Shale can be up to 9 centimeters in length). Specimens of Olenoides Superbus, pictured on the right, an especially large species, can reach sizes of well over 10 centimeters in length. Oleno

Ogygopsis is a genus of trilobite from the Cambrian of Antarctica and North America, specifically the Burgess Shale. It is the most common fossil in the Mt. Stephen fossil beds there, but rare in other Cambrian faunas. Its major characteristics are a prominent glabella with eye ridges, lack of pleural spines, a large spineless pygidium about as long as the thorax or cephalon, and its length: up to 12 cm. File:Ogygopsis reconstruction.jpg|Reconstruction of Ogygopsis klotzi in the Burgess Shale File:Royal Tyrrell Ogygopsis klotzi.jpg|At the Royal Tyrrell Museum of Palaeontology

thumb|left|Kootenia assemblage at the Geological Museum in Copenhagen