Cnidaria
From ZooTerms (Dictionary of Invertebrate Zoology)
Cnidaria also cnidarian (noun; Greek knide, nettle): 1. A phylum of primitive eumetazoans, including the hydras, jellyfish, sea anemones and corals, each bearing nematocysts.
2. In some classifications considered a subphylum of Coelenterata.
3. Sometimes considered synonymous with Coelenterata.
