prothorax

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Related to Prosternum: Propleuron

prothorax

[prō′thȯr‚aks]
(invertebrate zoology)
The first thoracic segment of an insect; bears the first pair of legs.
References in periodicals archive ?
Setae A2 and M2 on prosternum and seta A2 on thoracic sterna short, sensilliform; length of prosternal A2 = 3 [micro]m, of prosternal M2 = 1 [micro]m (Figs.
Prosternal process: portion of the prosternum extending posteriorly between the procoxae.
5' Prosternum con el margen anterior truncado; elitros no estriados (Figura 8) Paradonus
50 distance to coxal cavity; without short median impressed line on median basal lobe; prosternum separating procoxae for 0.
Thorax: Prosternum small and isolated (not large and abutting pronotum as in Oligopogon); propleuron fine setose; mesonotum flat (not greatly elevated and hump-like as in Oxynoton Janssens, 1951 and some Oligopogon) and punctate; acrostichal, dorsocentral, postpronotal and postalar macrosetae undifferentiated; scutellum lacking apical macrosetae; scutellar disc setose; anepimeral macroseta absent; katatergite setose; anatergites asetose; postmetacoxal area membranous; prothoracic femora slender; mesothoracic tarsomeres 4 and 5 without modified setae (as in Habropogon Loew, 1847); pulvilli well developed; metathoracic empodia simple (not large and laterally compressed as in Empodiodes Oldroyd, 1972); costa extends only as far as Cu[A.
2B, D); labium slightly surpassing posterior margin of prosternum, but not reaching middle of mesosternum (Fig.
Pleura light brown, with posterior margin of each sclerite blackish; prosternum light brown, with darker margins ; meso- and metasternum brown, with darker margins .
Morphology and evolution of the insect thorax) the prosternum in Chauliognathus consists of a short basisternum which is continuous with the furcasternum bearing simple, paired furcae.
Prosternum not visibly separating coxae for their entire length.