Characteristics of Ctenophora:

(i) They have a transparent body with biradial symmetry and are triploblastic.

(ii) They bear two tentacles and eight longitudinal rows of ciliary comb-plates for locomotion.

(iii) They are marine, solitary or free-swimming.

(iv) They lack nematocysts but adhesive cells (colloblasts) are present.

Examples: Pleurobrachia (comb jelly) and Ctenoplana