Biodiversity - Ecdysozoa

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)

Phyla:

• Priapulida
• …