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Opelet :: Opelet (n.) A bright-colored European actinian (Anemonia, / Anthea, sulcata); -- so called because it does not retract its tentacles..

Vestlet :: Vestlet (n.) Any one of several species of actinians belonging to the genus Cerianthus. These animals have a long, smooth body tapering to the base, and two separate circles of tentacles around the mouth. They form a tough, flexible, feltlike tube with a smooth internal lining, in which they dwell, whence the name..

Hydractinian :: Hydractinian (n.) Any species or marine hydroids, of the genus Hydractinia and allied genera. These hydroids form, by their rootstalks, a firm, chitinous coating on shells and stones, and esp. on spiral shells occupied by hermit crabs. See Illust. of Athecata..

Gonidial :: Gonidial (a.) Of or pertaining to the angles of the mouth; as, a gonidial groove of an actinian..

Actinozoa :: Actinozoa (n. pl.) A group of Coelenterata, comprising the Anthozoa and Ctenophora. The sea anemone, or actinia, is a familiar example..

Actinia :: Actinia (n.) An animal of the class Anthozoa, and family Actinidae. From a resemblance to flowers in form and color, they are often called animal flowers and sea anemones. [See Polyp.]..

Actinias :: Actinias (pl. ) of Actini.

Hexactinia :: Hexactinia (n. pl.) The Anthozoa.

Polyactinia :: Polyactinia (n. pl.) An old name for those Anthozoa which, like the actinias, have numerous simple tentacles..

Actiniae :: Actiniae (pl. ) of Actini.

Sea Amenone :: Sea amenone () Any one of numerous species of soft-bodied Anthozoa, belonging to the order Actrinaria; an actinian..

Acontia :: Acontia (n. pl.) Threadlike defensive organs, composed largely of nettling cells (cnidae), thrown out of the mouth or special pores of certain Actiniae when irritated..

Zoanthus :: Zoanthus (n.) A genus of Actinaria, including numerous species, found mostly in tropical seas. The zooids or polyps resemble small, elongated actinias united together at their bases by fleshy stolons, and thus forming extensive groups. The tentacles are small and bright colored..

Actinia :: Actinia (n.) A genus in the family Actinidae.

Anemone :: Anemone (n.) The sea anemone. See Actinia, and Sea anemone..

Scyphistoma :: Scyphistoma (n.) The young attached larva of Discophora in the stage when it resembles a hydroid, or actinian..

Actinoid :: Actinoid (a.) Having the form of rays; radiated, as an actinia..

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