types:

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anemone, sea anemone

marine polyps that resemble flowers but have oral rings of tentacles; differ from corals in forming no hard skeleton

sea pen

fleshy featherlike warm-water colonies

coral

marine colonial polyp characterized by a calcareous skeleton; masses in a variety of shapes often forming reefs

actinia, actinian, actiniarian

any sea anemone or related animal

gorgonian, gorgonian coral

corals having a horny or calcareous branching skeleton

madrepore, madriporian coral, stony coral

corals having calcareous skeletons aggregations of which form reefs and islands

type of:

cnidarian, coelenterate

radially symmetrical animals having saclike bodies with only one opening and tentacles with stinging structures; they occur in polyp and medusa forms