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pterostigma

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pterostigma [‚ter·ə′stig·mə]
(invertebrate zoology)
Opaque thickened spot occurring on the costal margin of an insect wing.
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Forewing elongate, oval, widest across the middle; costal break and pterostigma developed; vein C+Sc narrow, cell [m.
A review of Afrotropical plant-lice of the genus Moraniella, with ... by Burckhardt, Daniel; Kotrba, Marion / African Invertebrates
Antrusa can be characterized and delimited from Exotela Forster, Dacnusa Haliday and Chorebus Haliday by a combination of the following character states: (a) mandibles three-dentate, (b) vein nr antefurcal, (c) T1 with medial longitudinal carina, and (d) no sexual dimorphism of the pterostigma.
A new species of Dacnusini from Montecristo Island, with description ... by Tormos, Josep; Pardo, Xavier; Asis, Josep Daniel; Gayubo, Severiano F.; De La Nuez, Antonio / Florida Entomologist
The few similarities have probably co-evolved, for example, spinose costa, absent pterostigma and reduction in spermathecae from three.
A revision of Afrotropical Chyromyidae (excluding Gymnochiromyia ... by Ebejer, Martin J. / African Invertebrates
 
 
 
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