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D8gregarin91 :: d8Gregarin91 (n. pl.) An order of Protozoa, allied to the Rhizopoda, and parasitic in other animals, as in the earthworm, lobster, etc. When adult, they have a small, wormlike body inclosing a nucleus, but without external organs; in one of the young stages, they are amoebiform; -- called also Gregarinida, and Gregarinaria..

Protozoa :: Protozoa (n. pl.) The lowest of the grand divisions of the animal kingdom.

Sporogenesis :: Sporocyst (n.) Any protozoan when it becomes encysted produces germs by sporulation.

Metazoa :: Metazoa (n. pl.) Those animals in which the protoplasmic mass, constituting the egg, is converted into a multitude of cells, which are metamorphosed into the tissues of the body. A central cavity is commonly developed, and the cells around it are at first arranged in two layers, -- the ectoderm and endoderm. The group comprises nearly all animals except the Protozoa..

Nucleolus :: Nucleolus (n.) A small rounded body contained in the nucleus of a cell or a protozoan.

Cyst :: Cyst (n.) A form assumed by Protozoa in which they become saclike and quiescent. It generally precedes the production of germs. See Encystment.

Protozoic :: Protozoic (a.) Containing remains of the earliest discovered life of the globe, which included mollusks, radiates and protozoans..

Infusoria :: Infusoria (n. pl.) One of the classes of Protozoa, including a large number of species, all of minute size..

Proto- :: Proto- () A combining form prefix signifying first, primary, primordial; as, protomartyr, the first martyr; protomorphic, primitive in form; protoplast, a primordial organism; prototype, protozoan..

Gemma :: Gemma (n.) A bud spore; one of the small spores or buds in the reproduction of certain Protozoa, which separate one at a time from the parent cell..

Polystome :: Polystome (n.) An animal having many mouths; -- applied to Protozoa.

Sporid :: Spore (n.) One of the parts formed by fission in certain Protozoa. See Spore formation, belw..

Protozoan :: Protozoan (a.) Of or pertaining to the Protozoa.

Protozoon :: Protozoon (n.) A single zooid of a compound protozoan.

Nucleus :: Nucleus (n.) A body, usually spheroidal, in a cell or a protozoan, distinguished from the surrounding protoplasm by a difference in refrangibility and in behavior towards chemical reagents. It is more or less protoplasmic, and consists of a clear fluid (achromatin) through which extends a network of fibers (chromatin) in which may be suspended a second rounded body, the nucleolus (see Nucleoplasm). See Cell division, under Division..

Catallacta :: Catallacta (n. pl.) A division of Protozoa, of which Magosphaera is the type. They exist both in a myxopod state, with branched pseudopodia, and in the form of ciliated bodies united in free, spherical colonies..

Velum :: Velum (n.) A delicate funnel-like membrane around the flagellum of certain Infusoria. See Illust. a of Protozoa.

Proteus :: Proteus (n.) A changeable protozoan; an amoeba.

Swart :: Swarmspore (n.) One of the minute flagellate germs produced by the sporulation of a protozoan; -- called also zoospore.

Seta :: Seta (n.) Any slender, more or less rigid, bristlelike organ or part; as the hairs of a caterpillar, the slender spines of a crustacean, the hairlike processes of a protozoan, the bristles or stiff hairs on the leaves of some plants, or the pedicel of the capsule of a moss..

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