The polyp and medusa forms of the cnidarian life cycle are similar in that both bear stinging tentacles for feeding and have a somewhat bell-like shape. Also, they share the same basic form with a single opening to their gastrovascular cavity. In contrast, the polyp maybe colonial and it does not move. Also, the polyp tends to have a narrower rounded shape than the medusa.
Work Step by Step
Review the information in Concept 33.2, especially in Fig. 33.8, and make a list of the similarities and differences which you can see between polyp and medusa. Use this list for writing your answer.