Nematoda Support System
Hydrostatic
Annelida Support System
Hydrostatic
Platyhelminthes Support System
None
Rotifera Support System
Hydrostatic
Arthropoda Support System
Exoskeleton
Mulusca Support System
some exoskeleton
Porifera Support System
Spicules
Cnideria Support System
Hydrostatic
Echinodermata Support System
some exoskeleton
Chordata Support System
Endoskeleton