nounPlural medusas, Plural medusae
1medusa femininefor other names see jellyfish
- Cnidarians have two basic body forms, medusa and polyp.
- In polyps, medusae, and worms, all longitudinal and circumferential muscles attach to the thin body wall over a wide area.
- A medusa, or jellyfish, is part of the life cycle of just one major group of animals, the cnidarians.
- Two major adult body types characterize the phylum: the medusa is typically a mobile pelagic organism, and the polyp is typically a sessile benthic organism.
- Scyphozoan polyps and medusae exhibit no cephalization and contain no brain, but in some species, light-sensitive eyespots are located along the bell margin of the medusa.