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, gen.


, pl.


(dōr'sŭm, -sī, -să), [TA]
1. The back of the body.
2. The upper or posterior surface, or the back, of any part, especially in the quadrupedal position.
Synonym(s): tergum
[L. back]


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

ter′gal (-gəl) adj.


the plate of thickened, often chitinous material on the dorsal side of an insect segment, forming part of the EXOSKELETON.
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References in periodicals archive ?
armatus was described by Poisson (1948b) from seven localities in the Belgian Congo and distinguished from the nominate form by the presence of denticles on the left medial lobe of the 7th abdominal tergum in males.
24); tergum 10 with one pair of long setulae and 1 or 2 pairs of short setulae; cerci rather elongate, proportion of length/width 3.
In addition, the new species has a pair of remarkable trifid appendages on tergum 9, indicated by an arrow in Fig.
Metasoma: (1) first metasomal tergum filiform, widening little after the prominent spiracles in dorsal view; posteriorly strongly convex in lateral view; (2) tergum II 1.
Abdomen: Terga dark red-brown, shiny apruinose except for silver areas posterolaterally (that extend medially to almost centre of tergum, but not along posterior margin), white setose.
Tergum II had median basal triangular patch of scales, while terga III-VII had convex basal bands.
The abbreviations in the text are as follows: HW, head width; HL, head length; POD, postocellar distance; OOD, ocellocular distance; OCD, ocellooccipital distance; PW, petiole width in middle; PL, petiole length laterally; WTI, maximum width of metasomal tergum I; LTI, maximum length of metasomal tergum I; HLL, hind femur length; HTL, hind tibiae length.
In our analysis other morphological characters supporting this group include scutellum compressed (character 17, state 1), first metasomal tergum and sternum without numerous erect hairs outstanding above dense pubescence (characters 20, state l, and 21, state 1), and nest envelope reinforcement by secretion (character 30, state 1).
Chaetae M/s ratio on abdominal tergum V and chaetae formula on thoracic tergum I are notated after Gisin (1952).
Body pale yellow in life, without dark markings, except in antennal segments VI-VII, eyes with 4-6 red facets, comb on IX abdominal tergum and tip of mouth cone, 3,2-3,6 times as long as wide in mounted specimens.
Tergum 9 slightly sclerotized with a dark triangular, mid-posterior margin (Fig.
Tergum 9 slightly sclerotized but sclerotized along posterior margin, bearing paired areas of 3-4 multiple long hairs posteriorly.