Fossil occurrences Edit
4525 specimens of Canadaspis are known from the Greater Phyllopod bed, where they comprise 8.6% of the community.[4] Canadapsis perfecta, the type species, comes from the Cambrian-age Burgess Shale in British Columbia, Canada. Canadaspis are also found in different formations of the House Range of western Utah[5] as well as the Pioche Shale of Nevada.[2] Canadaspis laevigata, coming from the Chengjiang biota and thus some 10 million years older than Canadapsis perfecta,[6] is an equivocal member of the genus. Some scientists believe Canadaspis laevigata to be a more primitive Crustaceomorpha antecedent of Canadaspis, and others consider it a bi-valved arthropod of uncertain affinity.