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Brachyura :: Brachyura (n. pl.) A group of decapod Crustacea, including the common crabs, characterized by a small and short abdomen, which is bent up beneath the large cephalo-thorax. [Also spelt Brachyoura.] See Crab, and Illustration in Appendix..

Thorax :: Thorax (n.) The middle region of the body of an insect, or that region which bears the legs and wings. It is composed of three united somites, each of which is composed of several distinct parts. See Illust. in Appendix. and Illust. of Coleoptera..

Elater :: Elater (n.) Any beetle of the family Elateridae, having the habit, when laid on the back, of giving a sudden upward spring, by a quick movement of the articulation between the abdomen and thorax; -- called also click beetle, spring beetle, and snapping beetle..

Bell Bearer :: Bell bearer () A Brazilian leaf hopper (Bocydium tintinnabuliferum), remarkable for the four bell-shaped appendages of its thorax..

Pleura :: Pleura (n. fem.) The smooth serous membrane which closely covers the lungs and the adjacent surfaces of the thorax; the pleural membrane.

Baenosome :: Baenosome (n.) The thorax of Arthropods.

Scutellum :: Scutellum (n.) The third of the four pieces forming the upper part of a thoracic segment of an insect. It follows the scutum, and is followed by the small postscutellum; a scutella. See Thorax..

Baenomere :: Baenomere (n.) One of the somites (arthromeres) that make up the thorax of Arthropods.

Thoracoplasty :: Thoracoplasty (n.) A remodeling or reshaping of the thorax; especially, the operation of removing the ribs, so as to obliterate the pleural cavity in cases of empyema..

Arthrostraca :: Arthrostraca (n. pl.) One of the larger divisions of Crustacea, so called because the thorax and abdomen are both segmented; Tetradecapoda. It includes the Amphipoda and Isopoda..

Prosoma :: Prosoma (n.) The anterior of the body of an animal, as of a cephalopod; the thorax of an arthropod..

Hydrothorax :: Hydrothorax (n.) An accumulation of serous fluid in the cavity of the chest.

Echoscope :: Echoscope (n.) An instrument for intensifying sounds produced by percussion of the thorax.

Unicorn :: Unicorn (n.) Any large beetle having a hornlike prominence on the head or prothorax.

Spiracle :: Spiracle (n.) One of the external openings communicating with the air tubes or tracheae of insects, myriapods, and arachnids. They are variable in number, and are usually situated on the sides of the thorax and abdomen, a pair to a segment. These openings are usually elliptical, and capable of being closed. See Illust. under Coleoptera..

Metasternum :: Metasternum (n.) The ventral plate of the third or last segment of the thorax of insects.

Abdominothoracic :: Abdominothoracic (a.) Relating to the abdomen and the thorax, or chest..

Pneumothorax :: Pneumothorax (n.) A condition in which air or other gas is present in the cavity of the chest; -- called also pneumatothorax.

Abdomen :: Abdomen (n.) The posterior section of the body, behind the thorax, in insects, crustaceans, and other Arthropoda..

Cephalothorax :: Cephalothorax (n.) The anterior portion of any one of the Arachnida and higher Crustacea, consisting of the united head and thorax..

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