prosternum


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Related to prosternum: Propleuron

prosternum

(prəʊˈstɜːnəm)
n, pl -na (-nə) or -nums
(Zoology) the sternum of the prothorax of an insect
References in periodicals archive ?
Thorax: Prosternum large, abutting proepisternum and prothoracic coxae; dorsal (anterior) margin of prosternum with distinct flange-like projection (75); mesonotum strongly humped; postmetacoxal area membranous; anatergites asetose; pulvilli well developed; alula highly reduced (130); anal lobe and alula reduced and without bordering vein (ie.
Venter: Prosternum separated from fused meso- and metasternum and sternites I + II by a suture, the latter medially with an oval depression; metapleural scent gland canals distinct and visible from above, abdominal spiracles II-IV ventral, V-VIII lateral and visible from above.
Thorax: Prosternum fused with proepisternum; dorsocentral setae reach transverse suture but do not extend anterior to it; postpronotal lobe with fine, long setae; scutellum with only one pair of marginal macrosetae; anepisternum never with strong macroseta at superoposterior angle, in front of wing insertion; katatergite with a vertical row of macrosetae; anatergite setose.
Macropterous form: Thorax: Pronotum wider than long, with hispid tubercles, subquadrate, flattened, not declivous; frontal angles rounded, not projecting; humeral angles obtuse, not exposed; collar indistinctly depressed, not separated by a distinct incised line; middle third of pronotal disk with a broad longitudinal sulcus; anterolateral margins obliquely straight, roughly granulate; posterior margin concavely arcuate before base of scutellum; prosternum depressed; meso and metasternum sulcate; anterior lobe of metathoracic peritreme weakly reniform, posterior lobe subacute, raised; evaporative area short; posterior margin of metapleura with outer third obtusely rounded, and slightly raised.
Prosternum not visibly separating coxae for their entire length.
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.
Pectoral canal on prosternum open behind and passing anterior margin of mesocoxae, rostrum not touching middle coxa, but ending in receptacle on mesosternum, mesosternal process cavernous, forming receptacle, receptacle at least as long as wide, its inner margin U-shaped; mesosternum truncate between middle coxae, width of mesosternum separating middle coxae wider than the dorsal apex of the rostrum (Fig.
11 Prosternum bare; 3 or 4 pairs of postsutural dorsocentral setae; acrostichals 3:3, strongly developed; 1 species .
Venter: generally reddish to dark-reddish; pale to whitish on prosternum, extensive areas on propleura and abdominal sternites 3-7; mostly dense with semi-erect to erect golden yellow hairs.