metasternum


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metasternum

[¦med·ə′stər·nəm]
(invertebrate zoology)
The ventral portion of the metathorax in insects.
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Mesopleurae, mesosternum, metapleurae and metasternum sparsely covered with a few small granules.
The swollen metasternum and 2nd ventrite shorter than the 3rd and 4th ventrites combined suggest placement in the tribe Entimini.
Mesonotum with 1 long notopleural, 1 similar postalar and 4 scutellars (lateral pair very short, apical pair somewhat longer than notopleural seta, subparallel); acrostichals lacking; dorsocentrals uniserial, mostly minute, in holotype prescutellar pair obscured by pin (in paratype prescutellars very short, nearly as long as lateral scutellars); mesosternum and metasternum bare between posterior four coxae.
Prosternum with a pair of short, delicate and obtuse spines or tubercles, lateral lobes of meso- and metasternum ending in short, robust tubercles or bulges.
Venter: Prosternum medially elevated, with a conical tubercle directed toward coxae; median part of fused meso- and metasternum and sternites I + II with smooth oval depressions, a conical tubercle on posterolateral margin of meso- and metasternum reaching meso- and metacoxae; sternites III-VII separated by deep transversal grooves; abdominal spiracles II-IV ventral, V-VII placed on laterally projecting tubercles and visible from above, spiracle VII terminal on paratergites VIII.
Metasternum concave, with a deep vertical sulcus from the middle of the anterior portion to that of the posterior portion, and longerthan ventrite 3; metepisternite distinct, not concealed by elytra; mesepisternum complete, reaching the marginal line of the metasternum.
Metasternum obviously shortened, anterior postcoxal transverse grooves indistinct with row of coarse punctures along mesocoxal posterior margin; posterior antecoxal grooves and metasternal triangles distinct; metasternal plate slightly depressed medially, midline furrow barely indicated; surface with rather coarse and close, irregular setose punctures throughout.
Metasternum anteriorly tumid, with small, shallow punctures denser at apex and sides.
Integument: Body surface rather dull, almost glabrous; head, pronotum, scutellum, clavus, corium, connexivum, pro-, meso-, and metapleura, metasternum, abdominal sterna, male genital capsule and female genital plates densely punctate.
The following abbreviations were used in the figures: Clm (clypeal margin); Cs (cervical stria); CxI (procoxa); CxII (mesocoxa); CxIII (metacoxa); El (elytron); Elas (accessory stria of elytron); Elbs (basal stria of elytron); Epl (epipleuron); Eplc (epipleural carina); M2 (medial vein 2); Msem (mesoepimeron); Mtcxl (metacoxal line); Mtest (metaepisternum); Mtst (metasternum); Mtstk (metasternal keel); Mttac (metatarsal claw); Obc (oblongum cell); Prnt (pronotum); Prpl (propleuron); Prpr (prosternal process); Prst (prosternum); Prta2-4 (protarsomeres 2-4); Sc (scutellum).
Pro, meso y metasternum con vestidura setifera intensa y combinada (mediana y larga).