Hemichordata:

• This phylum consists of a small group of worm-like marine animals with organ-system level of organisation.
• They are bilaterally symmetrical, triploblastic and coelomate animals.
• Stomochord is present.
• The body is cylindrical and is composed of an anterior proboscis, a collar and a long trunk.
• Circulatory system is of open type.

Adult Echinodermata members, Coelenterata members and Ctinophora members show radial symmetry.