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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..

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..

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

Sea-pen :: Sea-pen (n.) A pennatula.

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..

Stem :: Stem (n.) The basal portion of the body of one of the Pennatulacea, or of a gorgonian..

Pennatulae :: Pennatulae (pl. ) of Pennatul.

Pennatulas :: Pennatulas (pl. ) of Pennatul.

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