- 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.
- 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.
- 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.
- 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.