mesothorax

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mesothorax

[¦me·zō′thȯ‚raks]
(invertebrate zoology)
The middle of three somites composing the thorax in insects.
References in periodicals archive ?
is similar to Paragongylopus (Paragongylopus) sinensis Chen & He, 1997, but can be easily distinguished by rough thorax, distinctly carinate mesonotum and presence of a rounded lamellate crest on fourth abdominal tergum.
tripunctata group because species in this group are all yellowish, in general dull or only slightly shining, without markings on the mesonotum; and with red eyes, darker dorsally than ventrally; sterno index about 0.6 and basal scutellar setae are generally divergent (Frota-Pessoa 1954).
Pronotum lighter between lateral carinae near the vertex; mesonotum whitish (Figs.
The mesonotum is completely fused with the propodeum, and the notopropodeal suture is completely absent.
Mesonotum rectangular with slightly protruding borders (in dorsal view); long golden-brown decumbent hairs scattered on dorsum; hairs absent on lateral regions.
The mesonotum and metanotum are almost without elevations, Meso/meta suture slightly concave.
Reticulation of mesonotum similar to pronutum, a pair of majar setae in sides and two pairs of minar setae on hind margin.
Thorax.-- Pronotum trapezoidal, widest at posterior margin, bearing widely dispersed hair-like sensilla on margins and shorter sensilla widely distributed distally, two small sternites each with two minute spines; meso- and metanota subequal in length; papilliform spiracle in pleural region of mesonotum near anterolateral margin of tergite.
Color dull yellowish, mid-dorsal vitta weak on mesonotum; forewings lacking dark coloration at apices.
Its members differ from those of other acridids by their invisible mesonotum or visible only from its posterior region (Costa & Carvalho 2007, Costa et al.
Mesonotum blackish, silver pruinose except for large lateral areas and medial band which are somewhat brownish pruinose, all fine setae white; macrosetae weakly developed, orange (2 notopleurals, 1 supra-alar, 1 postalar), acrostichals not evident, dorsocentrals weakly developed posterior of transverse suture only.