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Seta :: Seta (n.) One of the movable chitinous spines or hooks of an annelid. They usually arise in clusters from muscular capsules, and are used in locomotion and for defense. They are very diverse in form..

Chitin :: Chitin (n.) A white amorphous horny substance forming the harder part of the outer integument of insects, crustacea, and various other invertebrates; entomolin..

Theca :: Theca (n.) The chitinous cup which protects the hydranths of certain hydroids.

Chitinization :: Chitinization (n.) The process of becoming chitinous.

Prophragma :: Prophragma (n.) An internal dorsal chitinous process between the first two divisions of the thorax of insects.

Sertularian :: Sertularian (n.) Any species of Sertularia, or of Sertularidae, a family of hydroids having branched chitinous stems and simple sessile hydrothecae. Also used adjectively..

Elytrin :: Elytrin (n.) See Chitin.

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

Nervure :: Nervure (n.) One of the chitinous supports, or veins, in the wings of incests..

Periostracum :: Periostracum (n.) A chitinous membrane covering the exterior of many shells; -- called also epidermis.

Gizzard :: Gizzard (n.) A stomach armed with chitinous or shelly plates or teeth, as in certain insects and mollusks..

Taenidium :: Taenidium (n.) The chitinous fiber forming the spiral thread of the tracheae of insects. See Illust. of Trachea.

Wing :: Wing (n.) One of the two pairs of upper thoracic appendages of most hexapod insects. They are broad, fanlike organs formed of a double membrane and strengthened by chitinous veins or nervures..

Hydractinian :: Hydractinian (n.) Any species or marine hydroids, of the genus Hydractinia and allied genera. These hydroids form, by their rootstalks, a firm, chitinous coating on shells and stones, and esp. on spiral shells occupied by hermit crabs. See Illust. of Athecata..

Endophragma :: Endophragma (n.) A chitinous structure above the nervous cord in the thorax of certain Crustacea.

Urechitoxin :: Urechitoxin (n.) A poisonous glucoside found accompanying urechitin, and extracted as a bitter white crystalline substance..

Shell :: Shell (n.) The hard calcareous or chitinous external covering of mollusks, crustaceans, and some other invertebrates. In some mollusks, as the cuttlefishes, it is internal, or concealed by the mantle. Also, the hard covering of some vertebrates, as the armadillo, the tortoise, and the like..

Hypoderma :: Hypoderma (n.) An inner cellular layer which lies beneath the chitinous cuticle of arthropods, annelids, and some other invertebrates..

Entomolin :: Entomolin (n.) See Chitin.

Chitinous :: Chitinous (a.) Having the nature of chitin; consisting of, or containing, chitin..

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