Phylum Annelida:
  • These are triploblastic animals with a true body cavity.
  • They have a body that is segmented from head to tail.
  • They are mostly hermaphrodites (Both bisexual and unisexual).
  • They have locomotory structures known as parapodia for locomotion.
Phylum Annelida
Phylum Arthropoda:
  • This is a phylum that consists of the largest group of animals.
  • These triploblastic animals that have a segmented body.
  • Their body has a thick chitinous cuticle which forms an exoskeleton.
  • They have jointed legs. Hence they are known as arthropods as the term arthropod means jointed legs.
  • They are unisexual and show sexual dimorphism.
Phylum Arthropoda
Phylum Mollusca:
  • These are triploblastic soft bodied animals.
  • The body of these animals is unsegmented.
  • These organisms have a muscular head, foot and a visceral mass, a mantle and a calcareousshell.
  • They have sexual mode of reproduction.
Phylum Mollusa
Phylum Echinodermata:
  • These are exclusively marine triploblastic animals.
  • Their body is covered with spines and spicules.
  • Their body lacks segmentation and definite organs
  • They use water vascular system for the transport of food, gases and water throughout their body.
  • Locomotion and feeding is through tube feet.
  • They undergo sexual mode of reproduction.
Phylum Echinodermata