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Related to prothorax: pronotal, Pronotum, Propleuron


n. pl. pro·tho·rax·es or pro·tho·ra·ces (-thôr′ə-sēz′)
The anterior division of the thorax of an insect, bearing the first pair of legs.

pro′tho·rac′ic (-thə-răs′ĭk) adj.


n, pl -thoraxes or -thoraces (-ˈθɔːrəˌsiːz)
(Zoology) the first segment of the thorax of an insect, which bears the first pair of walking legs. See also mesothorax, metathorax


(proʊˈθɔr æks, -ˈθoʊr-)

n., pl. -tho•rax•es, -tho•ra•ces (-ˈθɔr əˌsiz, -ˈθoʊr-)
the anterior division of the thorax of an insect, bearing the first pair of legs.
[1820–30; < New Latin; see pro-1, thorax]
pro`tho•rac′ic (-θɔˈræs ɪk, -θoʊ-) adj.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.prothorax - the anterior part of an insect's thoraxprothorax - the anterior part of an insect's thorax; bears the first pair of legs
thorax - part of an insect's body that bears the wings and legs
References in periodicals archive ?
MEASUREMENTS" Male total length (from tip of siphon to apex of anteriorly extended rostrum) 45.50; body length 32.50; length of siphon 13.00; width of head 2.60; width of eye 0.80; interocular width 1.00; anterior width of prothorax 2.20; humeral width of prothorax 3.10; total length of prothorax (along midline) 8.50; length of anterior pronotal lobe along midline 5.60; length of posterior pronotal lobe along midline 2.90; fore leg: length of coxa 5.25, of femur 8.30, of tibia plus tarsus 3.7; middle leg: length of femur 13.10, of tibia 12.20, of tarsi excluding claws 2.20; hind leg: length of femur 14.20, of tibia 16.40, tarsi excluding claws 2.40.
Measurements (mm) worker: Total length 4.5-8.5 mm; Head length 1.4-2.0 mm; Head width 0.27-2.2 mm (including eyes in width); Eye length 0.2-0.4 mm; Eye width 0.17-0.27 mm; Prothorax width 0.8-1.2 mm;
It was noticed that the species belonging to flvescens, impressum, osborni, turbinatum, zerafae, and chelictiniae groups have five long and three short setae on each side margin of the prothorax, and Colpocephalum nanum (C.
A new species of troglobitic ground beetle from China, less than half an inch in length (about 9 mm), is striking in the dramatic elongation of its head and prothorax, the body segment immediately behind the head to which the first pair of legs attached.
Prothorax with two long slender spines ventrally between forelegs, tegmina without distinct dots
stephanoides Habitus; B) Basal cell of the forewing; C) Head; D) Detail of the rasplike structure in the hind tibia, and E) Area striolate of prothorax.
Swallowtail butterflies have different morphological characters viz; the repugnatorial organ which is present in papilionid caterpillar is called osemeterium bears on its prothorax. Normally osemeterium remnants unseen but while vulnerable the caterpillar turns it outward by an oblique dorsal groove by inflating it with fluid [23].
In two soybean fields, trenches (50cm long x 25cm wide x 30cm deep), 20 samples (25m apart), were made to assess mycobiota associated with Melolonthidae larvae, with evaluations of the mouthparts, prothorax, cuticle and digestive tract.