- Types:
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polyp
one of two forms that coelenterates take (e.g. a hydra or coral): usually sedentary with a hollow cylindrical body usually with a ring of tentacles around the mouth
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medusa, medusan, medusoid
one of two forms that coelenterates take: it is the free-swimming sexual phase in the life cycle of a coelenterate; in this phase it has a gelatinous umbrella-shaped body and tentacles
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jellyfish
any of numerous usually marine and free-swimming coelenterates that constitute the sexually reproductive forms of hydrozoans and scyphozoans
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scyphozoan
any of various usually free-swimming marine coelenterates having a gelatinous medusoid stage as the dominant phase of its life cycle
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hydroid, hydrozoan
colonial coelenterates having the polyp phase dominant
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actinozoan, anthozoan
sessile marine coelenterates including solitary and colonial polyps; the medusoid phase is entirely suppressed
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planula
the flat ciliated free-swimming larva of hydrozoan coelenterates
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Aegina
small medusa
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Chrysaora quinquecirrha
a type of jellyfish
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hydra
small tubular solitary freshwater hydrozoan polyp
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siphonophore
a floating or swimming oceanic colony of polyps often transparent or showily colored
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sertularian
feathery colony of long-branched stems bearing stalkless paired polyps
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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
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sea pen
fleshy featherlike warm-water colonies
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coral
marine colonial polyp characterized by a calcareous skeleton; masses in a variety of shapes often forming reefs
