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Ascidiform :: Ascidiform (a.) Shaped like an ascidian.

Pyrosome :: Pyrosome (n.) Any compound ascidian of the genus Pyrosoma. The pyrosomes form large hollow cylinders, sometimes two or three feet long, which swim at the surface of the sea and are very phosphorescent..

Urochord :: Urochord (n.) The central axis or cord in the tail of larval ascidians and of certain adult tunicates.

Sea Pork :: Sea pork () An American compound ascidian (Amoraecium stellatum) which forms large whitish masses resembling salt pork.

Endostyle :: Endostyle (n.) A fold of the endoderm, which projects into the blood cavity of ascidians. See Tunicata..

Stoloniferous :: Stolon (n.) An extension of the integument of the body, or of the body wall, from which buds are developed, giving rise to new zooids, and thus forming a compound animal in which the zooids usually remain united by the stolons. Such stolons are often present in Anthozoa, Hydroidea, Bryozoa, and social ascidians. See Illust. under Scyphistoma..

Tethyodea :: Tethyodea (n. pl.) A division of Tunicata including the common attached ascidians, both simple and compound. Called also Tethioidea..

Sea Pear :: Sea pear () A pedunculated ascidian of the genus Boltonia.

Ascidium :: Ascidium (n.) A genus of simple ascidians, which formerly included most of the known species. It is sometimes used as a name for the Ascidioidea, or for all the Tunicata..

Ascidiozooid :: Ascidiozooid (n.) One of the individual members of a compound ascidian. See Ascidioidea.

Ascidiarium :: Ascidiarium (n.) The structure which unites together the ascidiozooids in a compound ascidian.

Ascidian :: Ascidian (n.) One of the Ascidioidea, or in a more general sense, one of the Tunicata. Also as an adj..

Stigma :: Stigma (v. t.) One of the apertures of the gill of an ascidian, and of Amphioxus..

Atrium :: Atrium (n.) A cavity in ascidians into which the intestine and generative ducts open, and which also receives the water from the gills. See Ascidioidea..

Systematic :: System (n.) One of the stellate or irregular clusters of intimately united zooids which are imbedded in, or scattered over, the surface of the common tissue of many compound ascidians..

Social :: Social (a.) Forming compound groups or colonies by budding from basal processes or stolons; as, the social ascidians..

Sea Squirt :: Sea squirt () An ascidian. See Illust. under Tunicata.

Simple :: Simple (a.) Consisting of a single individual or zooid; as, a simple ascidian; -- opposed to compound..

Sea Peach :: Sea peach () A beautiful American ascidian (Cynthia, / Halocynthia, pyriformis) having the size, form, velvety surface, and color of a ripe peach..

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