Thoracic glands see prothoracic glands

thoracic region (ARTHRO: Insecta) The second of three regions of the embryonic trunk; the future locomotor center.

thoracic squama (ARTHRO: Insecta) In some Diptera, one of three membraneous lobes in the region of the wing base appearing to be derived from the posterior margin of the scutellum. see alula, alar squama.

thoracomere n. [Gr. thorax, chest; meros, part] (ARTHRO: Crustacea) A thoracic segment.

thoracopod(ite) n. [Gr. thorax, chest; pous foot] (ARTHRO: Crustacea) Any appendage of the thoracic somite; a cor-mopod. see phyllopod, maxilliped, pereopod.

thorax n.; pl. thoraxes, thoraces [Gr. thorax, chest] 1. (AR-THRO: Chelicerata) In Arachnida, fused with the head to form the cephalothorax of spiders. 2. (ARTHRO: Crustacea) The tagma between the cephalon and abdomen comprising the anterior part of the trunk; cormus; pereon. 3. (ARTHRO: Insecta) a. The body region behind the head, bearing the legs and wings and encompassing the pro-, meso- and metathorax. b. In Hymenoptera, the second tagma of the body consisting of pro-, meso-, metathorax and the epi-notum of Formicidae.

thread n. [A.S. thraed, twist] 1. A fine linear surface elevation.

2. (MOLL: Bivalvia) A narrow elevation on the shell surface.

3. (MOLL: Gastropoda) The silky fibers of the byssus.

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