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    • Sponges, Cnidarians, and Ctenophores 

      Debrenne, Françoise; Reitner, Joachim (The ecology of the Cambrian radiation, 2001)
      Sponges and coralomorphs were sessile epibenthic suspension feeders living in normal marine environments. Sponges with calcified skeletons, induding archaeocyaths, mainly inhabited shallow to subtidal and intertidal ...