- Ctenophores, commonly known as sea walnuts or comb jellies.
- The body bears eight external rows of ciliated comb plates, which help in locomotion.
- They are exclusively marine, radially symmetrical, diploblastic organisms with tissue level of organization.
- Bioluminescence is the property of a living organism to emit light, is found in ctenophores.
- Digestion is both extracellular and intracellular, sexes are not separate.
- Reproduction takes place only by sexual means, fertilization is external with indirect development.
Examples- Pleurobrachia and Ctenoplana.