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Protoprisma is a genus of sponge known from the Burgess Shale.[1]

References

  1. ^ Rigby, J. K.; Collins, D. (2004). “Sponges of the Middle Cambrian Burgess Shale and Stephen Formations, British Columbia”. ROM contributions in science. 1. ISBN 0-88854-443-X. ISSN 1710-7768.