metasternum


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metasternum

[¦med·ə′stər·nəm]
(invertebrate zoology)
The ventral portion of the metathorax in insects.
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Metasternum between middle coxae coarsely, distinctly punctuate near coxal margins, punctures separated by approximately one to two diameters .
Color dorsally black with blue or blue-green reflections; metasternum anteriorly distinctly prow shaped; well-developed males with anterior clypeal margin broadly truncate or shallowly emarginate; size frequently over 8 mm .
Micropterous, hemelytral membrane reaching posterior margin of abdominal segment VI; labium reaching middle third of metasternum (Venezuela) V.
Submacropterous to macropterous, hemelytral membrane almost reaching the apex of abdominal segment VII; labium reaching posterior margin mesosternum or basal third of metasternum 3
2A, D); scutellum flattened; pronotum and scutellum impunctate; posterior part of metepimeron roundish, not angulate; metasternum without medial outgrowth; R + M vein almost reaching apex of corium; inner margin of clavus longer than scutellum (Fig.
palmyra, although these two species share a distinctive morphology of the posterior male metasternum, which is strongly depressed and bisulcate, indicating a sister species relationship.
7, 18), male posteromedial process on the metasternum (Fig.
It was included in the Section 2 of the tribe Pentatomini by having a free median tubercle or spine at the base of third urosternite, without the posterior margin of the metasternum produced in apposition to the apex of that tubercle or spine (Rolston et al.
In the revision of the genus Thoreyella, Rolston (1984) identified these seven American genera of Pentatomini based in abdominal spine projecting beneath the metasternum and bucculae extending as lobes near to or past the distal end of the first rostral segment.
Prosternum sunken, with posterior third in front of the area between fore legs produced into narrowed acute, tubercle; mesosternum and metasternum at midline with wide longitudinal furrow; metathoracic peritreme auriculiform; evaporating area poorly developed.
Pronotum without paranotal lobes; rostral canal not enlarged on metasternum Leptoypha Stal
Median groove on thoracic sterna interrupted by a transverse sinuous carina between mesosternum and metasternum Gargaphia Stal