metathorax

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metathorax

[¦med·ə′thȯr‚aks]
(invertebrate zoology)
Posterior segment of the thorax in insects.
References in periodicals archive ?
Pronotum with short (0.3-0.5x OD), dense, minutelybranched setae along dorsal margin and pronotal lobe posteriorly; mesoscutum, mesoscutellum, and metanotum with sparse, long (1.1x OD), erect, minutely-branched setae arising among short (0.1-0.2x OD), denser (especially on lateral margins), simple setae; mesepisternum and lateral and posterior areas of propodeum with sparse, long (1.0x OD), erect, minutely-branched setae.
--Scutellum rounded in profile, metanotum not vertical in profile, but rather curving anteriorly towards scutellum (Fig.
Pronotum length 142.17, median width 186.52; posteromarginals, inner 40.52; posteroangulars, inner 60.32, outer 56.88; Median setae on metanotum length 49.19.
Rear margin of metanotum weakly convex, slightly emarginate in midline.
Scutellum and metanotum with sparse shallow small punctures, dorsal convex areas of propodeum even less distinctly punctate, strongly shiny, lateral areas of propodeum finely and superficially striate with some scattered punctures.
Thorax: Pronotum uniformly shaded with black, except two small yellowish marks on anterior region; mesonotum yellowish, shaded with black; mesoscutellum brownish with black marks, lateral regions yellowish, plumidium absent; metanotum yellowish shaded with black; pleural and stemal sclerites whitish.
Coloracion cafe oscuro, excepto la cabeza, antena, escutelo, axila, el metanotum y propodeo, estas estructuras presentan coloracion cafe tenue.
-- Pronotum elongate, moderately compressed anteriorly, extending onto lateral surfaces, ending in proximity to single well developed rectangular prosternal plate, covering almost the entire venter; meso- and metanotum less than half the length of the pronotum, thoracic nota with minute hair-like sensilla; spiracles in plural regions proximal to anterolateral margins of the mesonotum.