It consists of different classes like turbellaria, trematoda and cestoda. Turbellaria are free living flatworms living in aquatic habitat. Their body is unsegmented and has ciliated epidermis. They are also known as stirring organisms. They undergo sexual as well as asexual reproduction. They are hermaphrodite ...

Platy helminthes are also known as flat worms. It was the Aristotle who first mentioned it. They were placed in the same group by Gegenbaur. Most of them are parasite and rest of them are free living in fresh water, land etc. They have bilateral ...

The pennatula is also known as sea pen or sea father. It resides in the sandy areas of warm sea. It occurs in colonies and is sedentary. It is of carnivorous type. Their colony resembles a feather and is bilateral symmetrical. It consists of bulb ...

Astraea is also known as the star coral. They are exclusively marine and have an appearance of stone. They occur in colonies which are fixed and have a spreading nature. They are sedentary and have polyps. The polyps have multiple tentacles. It has a ...

Adamsia is also known as the sea anemone. It is mainly marine and is attached to the shell of gastropods. They are commensal organisms and show an association between sea anemone and the hermit crab. These organisms live together in which one organism is neither ...

Aurelia is also known as The Jelly fish. It occurs in the coast of oceans of the world. They are carnivorous and may swim actively or move passively. They have a ciliated larva. The body of Aurelia resembles the medusa of obelia. The ...

It is a marine cnidarian. It includes both the modes of sexual as well as asexual form of reproduction. It shows the phenomena of polymorphism and is carnivorous. It has a pneumatophore which resembles a bladder. It has a gas plant which secretes ...

Hydra is a fresh water cnidaria which has lakes and ponds as their habitat. It consists of tentacles, mouth, manubrium, stomach, testes, bud, peduncle and basal disc. The tentacles help to catch the prey. It is sedentary and moves by looping and somersaulting. Their mode ...