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Ctenophores, commonly known as sea walnuts or comb jellies are exclusively marine, radially symmetrical, diploblastic organisms with tissue level of organisation.

The body bears eight external rows of ciliated comb plates that helps in locomotion.

The have both extracellular and intracellular digestion.

Bioluminescence is well-marked in ctenophores.

Sexes are not separate.

Reproduction takes place only by sexual means.

Fertilisation is external with indirect development.

Organization Level : Tissue

Symmetry : Radial

Coelom : Absent

Respiratory system : Absent

Digestive system : Incomplete

Circulatory System : Absent

Examples:

Pleurobrachia and Ctenoplana.