Cnidaria, Coelenterata, phylum Cnidaria, phylum Coelenterata - hydras; polyps; jellyfishes; sea anemones; corals

actinozoan, anthozoan - sessile marine coelenterates including solitary and colonial polyps; the medusoid phase is entirely suppressed

Actinaria, Actiniaria, order Actinaria, order Actiniaria - sea anemones

Alcyonaria, order Alcyonaria - corals and sea anemones having eight branches

Madreporaria, order Madreporaria - stony corals

class - (biology) a taxonomic group containing one or more orders