海葵

[ noun ]
marine polyps that resemble flowers but have oral rings of tentacles; differ from corals in forming no hard skeleton
<noun.animal>

Sea anemone \Sea" a*nem"o*ne\ (Zo["o]l.)
Any one of numerous species of soft-bodied Anthozoa,
belonging to the order {Actinaria}; an actinian.

Note: They have the oral disk surrounded by one or more
circles of simple tapering tentacles, which are often
very numerous, and when expanded somewhat resemble the
petals of flowers, with colors varied and often very
beautiful.