Perspicaris
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Perspicaris is a fossil arthropod from the Cambrian period. It was 2 or 3 cm long and bivalved. The valves, encasing the thorax, were joined together by a dorsal hinge.
It is difficult to establish the lifestyle of Perspicaris. Its large eyes and other parts would suggest a swimming animal, yet it lacks claws, which seems to suggest a bottom feeder.[1]
Fossils of this creature are found in the famous Burgess Shale in British Columbia, Canada.