pterostigma


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Related to pterostigma: elytron, clitellum, proboscis, wigeon

pterostigma

[‚ter·ə′stig·mə]
(invertebrate zoology)
Opaque thickened spot occurring on the costal margin of an insect wing.
References in periodicals archive ?
Proceso terminal entre tres y cinco Toxoptera aurantii veces mas largo que el tramo proximal ("base") de su respectivo segmento antenal; auda digitiforme, con menos de 20 setas; alas anteriores con una sola bifurcacion de la vena Media (M) y pterostigma oscuro (Figura 15) 8'.
Results also showed localized variation in the shape of the pterostigma and triangle among the species.
First abscissa of radius straight, longer than width of pterostigma.
Key to the species of Genus Proan Haliday: Antennae 17 segmented; tergite-1 subquadrate; mesoscutum with central lobes densely pubescent; pterostigma 1.
1B) slightly (1/6) shorter than length of pterostigma and prongs curved in basal half (Fig.
Fore wing with two brown bands, one near the middle, the other at the posterior margin; pterostigma yellow; hind wing infuscate (hyaline yellow).
4dcaptioned "Ischnura evansi female in a brighter gynomorph colouration" is actually a female Ischnura senegalensis, based on the shape of the pterostigma and the ovipositor, which can be seen better in the original photograph.
3); pterostigma of fore wing subtriangular, vein m-cu antefurcal; length of 1st tergite nearly equal to its apical width; 2nd tergite smooth or almost entirely longitudinally striate; combined length of 2nd and 3rd metasomal tergites 0.
17); apex of pterostigma generally reddish; posterior margin of pygophore deeply emarginate .