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Pennatula :: Pennatula (n.) Any one of numerous species of Pennatula, Pteroides, and allied genera of Alcyonaria, having a featherlike form; a sea-pen. The zooids are situated along one edge of the side branches..

Heliopora :: Heliopora (n.) An East Indian stony coral now known to belong to the Alcyonaria; -- called also blue coral.

Pennatulacea :: Pennatulacea (n. pl.) A division of alcyonoid corals, including the seapens and related kinds. They are able to move about by means of the hollow muscular peduncle, which also serves to support them upright in the mud. See Pennatula, and Illust. under Alcyonaria..

Actinaria :: Actinaria (n. pl.) A large division of Anthozoa, including those which have simple tentacles and do not form stony corals. Sometimes, in a wider sense, applied to all the Anthozoa, expert the Alcyonaria, whether forming corals or not..

Umbellularia :: Umbellularia (n.) A genus of deep-sea alcyonaria consisting of a cluster of large flowerlike polyps situated at the summit of a long, slender stem which stands upright in the mud, supported by a bulbous base..

Alcyonacea :: Alcyonacea (n. pl.) A group of soft-bodied Alcyonaria, of which Alcyonium is the type. See Illust. under Alcyonaria..

Virgularian :: Virgularian (n.) Any one of numerous species of long, slender Alcyonaria belonging to Virgularia and allied genera of the family Virgularidae. These corals are allied to the sea-pens, but have a long rodlike rhachis inclosing a slender, round or square, calcareous axis. The polyps are arranged in transverse rows or clusters along each side of the rhachis..

Alcyonoid :: Alcyonoid (a.) Like or pertaining to the Alcyonaria.

Sclerobase :: Sclerobase (n.) The calcareous or hornlike coral forming the central stem or axis of most compound alcyonarians; -- called also foot secretion. See Illust. under Gorgoniacea, and Coenenchyma..

Veretillum :: Veretillum (n.) Any one of numerous species of club-shaped, compound Alcyonaria belonging to Veretillum and allied genera, of the tribe Pennatulacea. The whole colony can move about as if it were a simple animal..

Alcyonium :: Alcyonium (n.) A genus of fleshy Alcyonaria, its polyps somewhat resembling flowers with eight fringed rays. The term was also formerly used for certain species of sponges..

Alcyonoid :: Alcyonoid (n.) A zoophyte of the order Alcyonaria.

Gorgoniacea :: Gorgoniacea (n. pl.) One of the principal divisions of Alcyonaria, including those forms which have a firm and usually branched axis, covered with a porous crust, or c/nenchyma, in which the polyp cells are situated..

Alcyonic :: Alcyonic (a.) Of or pertaining to the Alcyonaria.

Spicule :: Spicule (n.) Any small calcareous or siliceous body found in the tissues of various invertebrate animals, especially in sponges and in most Alcyonaria..

Sclerite :: Sclerite (n.) A hard chitinous or calcareous process or corpuscle, especially a spicule of the Alcyonaria..

Alcyonaria :: Alcyonaria (n. pl.) One of the orders of Anthozoa. It includes the Alcyonacea, Pennatulacea, and Gorgonacea..

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