This chapter deals with the promising secondary metabolites of the different
constituents of marine cnidarians viz. hydrozoan medusae, scyphozoan medusae and
soft corals and their bioactivities. Among the chemical classes of compounds,
terpenoids ranked first and cytotoxicity of these compounds was the major activity.
Keywords: Bioactivities, Hydrozoan medusae, Marine cnidarians, Scyphozoan medusae, Soft corals, Secondary metabolites.
