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Animal diversity, common ancestor, phylum: Cycliophora, Lack backbone -…

- - - - Myxini
        
        Has a skull, brain and other sensory organs
- - - - covered in Tough exoskeleton
      - Live as sessile colonies
  - - - acanthocephalans
        
        highly modified parasites of vertebrates
    - - microscopic animals with complex organs systems
- - - - Radially symmetrical body
      - Diploblastic
      - Gastrovascular cavity with a single opening that serves as both mouth and anus
    - - phylum: Deuterostomia
  - - - Sponges
        
        Filter feeders: They filter out food particles suspended in the surrounding water and draw it through their body which in some species resembles sac perforated with pores
        
        Watre flows out from osculum
        
        water is drawn through the spongocoel
        
        Lack tissue