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Trematodea :: Trematodea (n. pl.) An extensive order of parasitic worms. They are found in the internal cavities of animals belonging to all classes. Many species are found, also, on the gills and skin of fishes. A few species are parasitic on man, and some, of which the fluke is the most important, are injurious parasites of domestic animals. The trematodes usually have a flattened body covered with a chitinous skin, and are furnished with two or more suckers for adhesion. Most of the species are hermaphrodi

Entozoa :: Entozoa (n. pl.) A group of worms, including the tapeworms, flukes, roundworms, etc., most of which live parasitically in the interior of other animals; the Helminthes..

Shooi :: Shooi (n.) The Richardson's skua (Stercorarius parasiticus);- so called from its cry.

Hydrachnid :: Hydrachnid (n.) An aquatic mite of the genus Hydrachna. The hydrachnids, while young, are parasitic on fresh-water mussels..

Tick :: Tick (n.) Any one of numerous species of large parasitic mites which attach themselves to, and suck the blood of, cattle, dogs, and many other animals. When filled with blood they become ovate, much swollen, and usually livid red in color. Some of the species often attach themselves to the human body. The young are active and have at first but six legs..

Squawweed :: Squawroot (n.) A scaly parasitic plant (Conopholis Americana) found in oak woods in the United States; -- called also cancer root.

Lernaeacea :: Lernaeacea (n. pl.) A suborder of copepod Crustacea, including a large number of remarkable forms, mostly parasitic on fishes. The young, however, are active and swim freely. See Illustration in Appendix..

Stagger :: Stagger (n.) A disease of horses and other animals, attended by reeling, unsteady gait or sudden falling; as, parasitic staggers; appopletic or sleepy staggers..

Hydatid :: Hydatid (n.) A membranous sac or bladder filled with a pellucid fluid, found in various parts of the bodies of animals, but unconnected with the tissues. It is usually formed by parasitic worms, esp. by larval tapeworms, as Echinococcus and Coenurus. See these words in the Vocabulary..

Vermes :: Vermes (n. pl.) An extensive artificial division of the animal kingdom, including the parasitic worms, or helminths, together with the nemerteans, annelids, and allied groups. By some writers the branchiopods, the bryzoans, and the tunicates are also included. The name was used in a still wider sense by Linnaeus and his followers..

Dicyemata :: Dicyemata (n. pl.) An order of worms parasitic in cephalopods. They are remarkable for the extreme simplicity of their structure. The embryo exists in two forms.

Louse :: Louse (n.) Any one of numerous species of small, wingless, suctorial, parasitic insects belonging to a tribe (Pediculina), now usually regarded as degraded Hemiptera. To this group belong of the lice of man and other mammals; as, the head louse of man (Pediculus capitis), the body louse (P. vestimenti), and the crab louse (Phthirius pubis), and many others. See Crab louse, Dog louse, Cattle louse, etc., under Crab, Dog, etc..

Parasita :: Parasita (n. pl.) An artificial group formerly made for parasitic insects, as lice, ticks, mites, etc..

The Gapes :: The gapes () A disease of young poultry and other birds, attended with much gaping. It is caused by a parasitic nematode worm (Syngamus trachealis), in the windpipe, which obstructs the breathing. See Gapeworm..

Scolex :: Scolex (n.) The embryo produced directly from the egg in a metagenetic series, especially the larva of a tapeworm or other parasitic worm. See Illust. of Echinococcus..

Pulex :: Pulex (n.) A genus of parasitic insects including the fleas. See Flea.

Lernean :: Lernean (n.) One of a family (Lernaeidae) of parasitic Crustacea found attached to fishes and other marine animals. Some species penetrate the skin and flesh with the elongated head, and feed on the viscera. See Illust. in Appendix..

Parasiticide :: Parasiticide (n.) Anything used to destroy parasites.

Poecilopoda :: Poecilopoda (n. pl.) Originally, an artificial group including many parasitic Entomostraca, together with the horseshoe crabs (Limuloidea)..

Entomophaga :: Entomophaga (n. pl.) One of a group of hymenopterous insects whose larvae feed parasitically upon living insects. See Ichneumon, 2..

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