- hydrozoan, hydroid - colonial coelenterates having the polyp phase dominant
--1 is a kind of class; coelenterate, cnidarian; class; coelenterate, cnidarian
--1 is a member of --1 has members:
--1 has particulars: planula; hydra; siphonophore; sertularianhydrozoan, hydroid; genus Hydra; Siphonophora, order Siphonophora; Sertularia, genus Sertularia