Also found in: Thesaurus, Medical, Encyclopedia, Wikipedia.
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 ?
Prothorax with two long slender spines ventrally between forelegs, tegmina without distinct dots
Swallowtail butterflies have different morphological characters viz; the repugnatorial organ which is present in papilionid caterpillar is called osemeterium bears on its prothorax.
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.
Antennae extending to the prothorax, first tarsal segment longer or shorter than length of 2nd and 3rd together, sturdy body .
Margin of prothorax ocher with a white spot dorsally on mesothorax, and a conspicuous black spot dorsally on A4 to A5 abdominal segment.
The prothorax is surrounded by a band of one and two sharp pointed spinules, grouped in a varying number and usually more densely arranged in the ventral part.
20,23) They are morphologically similar, with a narrow body, black head, at least two abdominal segments, and the prothorax and the first 5 abdominal segments are russet coloured (14) (Fig.
The examined specimens differ from the original description in their color pattern as follows (characters from original description translated from the French by Costa and Garrison 2001 in parenthesis): head black dull dorsally (orangish russet); prothorax black with lateral edges green pale (russet); pterothorax black dorsally with green pale antehumeral stripe present (russet, a little darker dorsally); abdomen shiny black dorsally (orangish russet dorsally), olive green ventrally (yellow).
Peritrich colonies with a maximum of five or six branches were observed attached to the venter of the extended nasale, on the mouthparts, ventrally at the union of the cranium and prothorax, and on the seventh abdominal segment.