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Sporocyst :: Sporocyst (n.) An asexual zooid, usually forming one of a series of larval forms in the agamic reproduction of various trematodes and other parasitic worms. The sporocyst generally develops from an egg, but in its turn produces other larvae by internal budding, or by the subdivision of a part or all of its contents into a number of minute germs. See Redia..

Porpita :: Porpita (n.) A genus of bright-colored Siphonophora found floating in the warmer parts of the ocean. The individuals are round and disk-shaped, with a large zooid in the center of the under side, surrounded by smaller nutritive and reproductive zooids, and by slender dactylozooids near the margin. The disk contains a central float, or pneumatocyst..

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

Spirant :: Spiralozooid (n.) One of the special defensive zooids of certain hydroids. They have the form of long, slender tentacles, and bear lasso cells..

Zooidal :: Zooidal (a.) Of or pertaining to a zooid; as, a zooidal form..

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

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..

Zooid :: Zooid (n.) An animal in one of its inferior stages of development, as one of the intermediate forms in alternate generation..

Gonosome :: Gonosome (n.) The reproductive zooids of a hydroid colony, collectively..

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

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..

Nectocalyx :: Nectocalyx (n.) One of the zooids of certain Siphonophora, having somewhat the form, and the essential structure, of the bell of a jellyfish, and acting as a swimming organ..

Calicle :: Calicle (n.) One of the small cuplike cavities, often with elevated borders, covering the surface of most corals. Each is formed by a polyp. (b) One of the cuplike structures inclosing the zooids of certain hydroids. See Campanularian..

Gonophore :: Gonophore (n.) A sexual zooid produced as a medusoid bud upon a hydroid, sometimes becoming a free hydromedusa, sometimes remaining attached. See Hydroidea, and Illusts. of Athecata, Campanularian, and Gonosome..

Hydrosoma :: Hydrosoma (n.) All the zooids of a hydroid colony collectively, including the nutritive and reproductive zooids, and often other kinds..

Trophosome :: Trophosome (n.) The nutritive zooids of a hydroid, collectively, as distinguished from the gonosome, or reproductive zooids..

Siphonophora :: Siphonophora (n. pl.) An order of pelagic Hydrozoa including species which form complex free-swimming communities composed of numerous zooids of various kinds, some of which act as floats or as swimming organs, others as feeding or nutritive zooids, and others as reproductive zooids. See Illust. under Physallia, and Porpita..

Vibraculum :: Vibraculum (n.) One of the movable, slender, spinelike organs or parts with which certain bryozoans are furnished. They are regarded as specially modified zooids, of nearly the same nature as Avicularia..

Tritozooid :: Tritozooid (n.) A zooid of the third generation in asexual reproduction.

Proliferous :: Proliferous (a.) Producing sexual zooids by budding; -- said of the blastostyle of a hydroid.

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