metathorax

(redirected from metathoracic)
Also found in: Dictionary, Medical.

metathorax

[¦med·ə′thȯr‚aks]
(invertebrate zoology)
Posterior segment of the thorax in insects.
References in periodicals archive ?
Thorax black; pronotum black, hexagonal, with a median carina strongly marked; pronotum with anterior margin straight, lateral-anterior margins straight, lateral posterior margin slightly sinuous, posterior margin grooved; scutellum brownish with slight central concavity, with horizontal grooves strongly marked; tegmina black, apical plexus of veins developed; hindwings hyaline with dark brown venation, vein Cu1 not thickened at base; legs black; metathoracic tibia with two lateral spines (basal spine equal in size to spines in apical crown; apical spine larger than spines in apical crown); apical crown of spines on tibia consisting of two rows; basitarsus with two rows of spines covered by long setae; subungueal process present and quadrangular.
Pronotum more than twice as broad as long, lateral margins anteriorly dentate and posteriorly sinuate, anterior angles acute, humeral angles subacute; length of pronotum 4.0 mm, width of pronotum 8.2 mm; scutellum distinctly longer than broad at base, reaching up to 6th abdominal sternum with apex u-shaped; length of scutellum 7.4 mm, width 6.0 mm at base, metathoracic scent gland apparatus (Fig.
3A): Formed by (a) triangular anterodorsal sclerite (ventrally turned part of metascutum?), (b) long, broad and compact metepisternum forming unusually large precoxale, (c) auricle of the metathoracic gland opening (Fig.
3) pale brown except coxae and trochanters dark brown, hindfemur dark brown except base and extreme apex paler, hindtibia with subbasal, small dorsal dark spot; base of fore and midfemora brown (more evident on midleg), midtibia with subbasal, very small dark spot; femora and tibia with appresed striated brown scales; ventral palisade setae on tarsomeres 1-3 in all legs; hindtibial spur yellowish, length slightly shorter than width of hindtibia at midlength; hindtibial comb with two rows of spines, apical row with 8-9 spines, subapical row with 12-13 spines; prothoracic TR 0.86 (0.83-0.89, n = 11), mesothoracic TR 0.68 (0.62-0.73, n = 13), metathoracic TR 0.64 (0.59-0.69, n = 13); claws slender, curved; empodia present.
Each crawl began at the terminal segment and proceeded anteriorly through the abdomen as a series of phase-delayed steps in sequential segments, ending at the metathoracic segment.
These five characters were the radial cell, cell radius one, and medio-cubital crossvein on the forewing; the metathoracic femur; and the antennal scape (see Ross and Robertson [1990] for descriptions of the characters).
Roemer H, Marquart V (1984) Morphology and physiology of auditory interneurons in the metathoracic ganglion of the locust.
Lateral margins of pronotum completely dentate except humeral angles, dentine on posterior portion slightly less prominent, anterior angles acutely produced but not extending beyond eyes, humeral angles quite acute; length of pronotum 4.0 mm, width 10.0 mm; scutellum reaching to fifth abdominal tergum, with u-shaped apical lobe, subacute at apex; length of scutellum 8.6 mm, and width at base 5.8 mm; metathoracic scent gland ostioles (Fig.
Thorax: Dorsally brown, ventrally white; prothoracic leg creamy; meso- and metathoracic legs with femur brown dorsally and white ventrally, the other segments light brown.