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n. pl. ter·ga (-gə)
The dorsal portion of a body segment of an arthropod.

[Latin, back.]

ter′gal (-gəl) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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Male with tergal papillae in at least one of the segments II to VII.
Tergal chaetotaxy (I-XI): 11: 11: 11: 11: 13: 12: 12: 13: 12: 15: 8; sternal chaetotaxy (IV-XI): 8: 15: 16: 14: 15: 14: 11: 7; stigmata with 5-6 setae around; anal cone with 2 dorsal and 2 ventral setae.
Dorsal wall of trunk-armour embayed anteriorly to accommodate head; tergal angle situated far forward; anterior median dorsal plate with breadth/length index between 100 and 128; pectoral articulation subcephalic; funnel pit of processes brachialis in anterior ventro-lateral very small; pars pedalis under angle to longitudinal body axis.
Tergal glands and genitalia were prepared for examination as described by Roth (1985).
Abdomen: Oblong, rounded at posterior; thick tergal plates, darkly pigmented; chaetotaxy scares specially in female characteristic; male terminalia deeply convex and medially concave in females; well developed subgenital plate having versatile arrangement of setae; genital opening dorsal in position.
Two medial tergal setae and two submedial tergal setae are on sternites 1-9.
In the Chinese female, the body is more nearly circular; the maxilliped's palp does not articulate, and its spur is much reduced; the first oostegite has a slightly more slender and longer posterolateral point, which is setose along its lateral margin; the posterior pereomeres bear tergal plates distinctly separated from the segments; and the lateral plates of the pleomeres are quite sharply pointed.
Segments 1-5 strongly sclerotized dorsally, anterotransverse carinae distinct, each prescutum with an additional anterior carina, numerous small sensilla with four longer hair-like sensilla, spiracles near each anterolateral tergal margin; AB6 strongly sclerotized dorsally, laterally, and ventrolateral; ventral membranous area narrow, spiracles opening laterally at or near the dorso-pleural line distant from obscure lateral margin of turgum, carinae and chaetotaxy as on segments 1-5; segment 7 completely sclerotized.