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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..

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..

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

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

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

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

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..

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

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

Ascidia :: Ascidia (pl. ) of Ascidiu.

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

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..

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

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

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

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..

Utricularia :: Utricularia (n.) A genus of aquatic flowering plants, in which the submersed leaves bear many little utricles, or ascidia. See Ascidium,.

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

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