A class of marine coelenterates which comprises the jellyfishes.
- ‘Most hydrozoans show the same alternation between polyp and medusa phases that the Scyphozoa, or ‘true’ jellyfish, have.’
- ‘The Scyphozoa, or jellyfish, are an exclusively marine class in which the medusoid stage dominates.’
- ‘The phylum has traditionally been divided into four classes (Anthozoa, Scyphozoa, Hydrozoa and Cubozoa) distinguished by variation in these life cycle characteristics.’
- ‘Originally grouped as an order within the class Scyphozoa, the Cubozoa were elevated to class status once research revealed the magnitude of the differences between this and other cnidarian groups.’
- ‘The groups Hydrozoa, Scyphozoa and Cubozoa all are generally characterized as having polyps and medusae (although minor lineages have lost medusae and in some cases polyps).’
- ‘Fission is typical in many anthozoans as well as in Hydrozoa and Scyphozoa, so it is reasonable to hypothesize that the cellular and molecular mechanisms involved may be similar among all cnidarians.’
Modern Latin (plural), from Greek skuphos drinking cup + Greek zōion animal.