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    • A vanished history of skeletonization in Cambrian comb jellies 

      Ou, Q.; Xiao, S.; Han, J.; Sun, G.; Zhang, F.; Zhang, Z.; Shu, D. (2015-07)
      Ctenophores are traditionally regarded as "lower" metazoans, sharing with cnidarians a diploblastic grade of organization. Unlike cnidarians, where skeletonization (biomineralization and sclerotization) evolved repeatedly ...