Biodiversity - Ecdysozoa

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Ecdysozoa = invertebrates that grow by moulting (ecdysis)

Key features:

  • multicellular = metazoan
  • have tissues and organs
  • possess exoskeleton
  • grow by moulting
  • 1.5m species known
  • radial OR bilateral symmetry
  • triploblastic (ectoderm, mesoderm, endoderm)
  • acoelom, pseudocoelom or coelom
  • protostome or deuterstome (proto = mouth first, deuter = anus first)
  • segmentation/metarmerism (muscle blocks)


  • Priapulida


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