Phylum Ctenophora :

• Ctenophores are commonly known as sea walnuts or comb jellies.
• Habitat -
•  They are exclusively marine animals.
• Body symmetry -
•  They are radially symmetrical.
• Body wall -
•  They are diploblastic organisms.
• Level of organization -
•  Ctenophores exhibit tissue level of organization.
• Digestion 
• is both extracellular and intercellular.
• Locomotion -
•  The body bears eight external rows of ciliated comb plates, these help in locomotion.
• Bioluminescence
• is a property of living organism to emit light is well-marked in ctenophores.
• Reproduction 
• - Sexes are not separate, reproduction is by sexual means only.
• Fertilization
• is external with indirect development.
• Example: Pleurobrachia