The ctenophores, or comb jellies, are delicate, mostly pelagic, carnivorous, marine animals with biradial symmetry and diploblastic organization.
Some true organs are present.
Comb jellies resemble scyphomedusae but differ from them in several important respects. There is no equivalent of the polyp and no dimorphism or colonial organization. The gut begins with a mouth and ectodermal pharynx and ends with a pair of anal pores. Digestion is extracellular and intracellular and the gut is divided into digestive and distributive regions as it is in scyphozoans. Cilia are well developed and used for a variety of purposes.