Coelenterata
From ZooTerms (Dictionary of Invertebrate Zoology)
Coelenterata also coelenterate (noun; Greek koilos, hollow; enteron, intestine): 1. A group of diploblastic, mostly marine animals with a single internal cavity with an oral opening.
2. Cnidaria (=Coelenterata).
3. A phylum containing two subphyla, Cnidaria and Ctenophora in some classifications.
