metathorax

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metathorax

[¦med·ə′thȯr‚aks]
(invertebrate zoology)
Posterior segment of the thorax in insects.
References in periodicals archive ?
2012) suggested the metathoracic spiracle is likely to play a role in spreading the secretion in terrestrial heteropterans and discussed the problems encountered by half-spherical species.
19 Metathoracic femora uniformly orange 20 -- Metathoracic femora extensively dark red-brown with orange proximal and distal ends torsteni sp.
VENTRAL COLORATION: Ground color pale brownish orange; acetabulae, posterior margin of metapleura, and anterior and posterior lobe of metathoracic peritreme, pale yellowish to yellowish orange; rostral segments I to IV dark reddish brown; coxae and trochanters reddish brown with pale brownish orange marks; femora and tibiae pale yellowish orange with dark to pale brown spots; tarsi reddish brown; lateral margins of abdominal sterna III to VII with irregular black spot.
Mesothoracic and metathoracic spiracles were viewed at 400X and classified as compound or simple.
DESCRIPTION: Male (holotype): COLORATION: General coloration yellow with dark brown and pale pink spots on antennal segments I to III, anterolateral margins of pronotal disk, corial veins, posterior half and upper margin of connexivum, thorax, legs, abdominal sterna, and genital capsule; head dorsally yellow with short dark brown spot anterior to each ocelli; antennal segment IV pale castaneous orange; labial segments I to III pale yellowish orange and IV dark orange; apex of scutellum pale yellow; hemelytral membrane translucent with veins and basal angle brown; labial segments I to III yellow and IV dark orange; anterior and posterior lobe of metathoracic peritreme pale yellow; abdominal segments pale castaneous orange, scattered with brown and pink spots; mesopleura black.
Meso- and metathoracic legs were subequal in length and longer than prothoracic legs (Table I).
Synergus filicornis: mature larva: Spiracle showing the atrium (a) with asperities (as), closing apparatus (ca), and beginning of the trachea (t), with detail of mesothoracic [2c (under SEM), peritreme -see arrow-], metathoracic (2a, under SEM) and abdominal [2b (under SEM), first segment] spiracles.
No macropterous form is known for any of the two species of Paraphrynovelia, and Damgaard (2008b) could not find any convincing morphological characters to diagnose Paraphrynoveliidae, whereas Macroveliidae was diagnosed by the presence of paired, longitudinal ridges of the basal abdominal tergites and two characters also found in Hydrometridae: Eyes distinctly removed from the anterior margin of prothorax and the dorsally placed metathoracic spiracle.
Body black, elliptical, 731-840 [micro]m long, 413-630 [micro]m wide, broadest at the metathoracic region.
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.
The Monaloniina (except Felisacus Distant, 1904) and Odoniellina together are united by several external morphological characters, with the most important being the reduction of the efferent system of the metathoracic glands, linear trichobothria, absence of trichoma, bothrium tubercular, and unique structure of pretarsus with wide pseudopulvilli, hair-like parempodia and long guard setae (Schuh, 1976).