1) Class 2) Class scyphozoa 
(from the article `cnidarian`) The phylum Cnidaria is made up of four classes: Hydrozoa (hydrozoans); Scyphozoa (scyphozoans); Anthozoa (anthozoans); and Cubozoa (cubozoans). The ... ...bell margin; gonads on radial canals arising from the stomach. Polyp and asexual reproduction absent.Class ScyphozoaExclusively marine group in ... F...
Scyphozoa is the class of marine animals known as jelly-fishes. The adult is always medusoid, and there is an extensive system of radial canals, sense organs and tentaculocysts.
[n] - coelenterates in which the polyp stage is absent or at least inconspicuous: jellyfishes
the true jellyfish, members of the phylum Cnidaria 
class Scyphozoa noun coelenterates in which the polyp stage is absent or at least inconspicuous: jellyfishes