The pterostigma (plural: pterostigmata) is a cell in the outer wing of insects which is often thickened or coloured and so stands out from other cells. It is particularly noticeable in dragonflies, but present also in other insect groups, such as snakeflies, hymenopterans and megalopterans. The purpose of the pterostigma, being a heavier section o...
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http://en.wikipedia.org/wiki/Pterostigma
• (n.) A thickened opaque spot on the wings of certain insects.
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http://thinkexist.com/dictionary/meaning/pterostigma/
A small coloured area near the wing-tip of dragonflies, bees, and various other clear-winged insects: also called the stigma.
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http://www.earthlife.net/insects/glossary.html
A thickened opaque or dark spot along the costal margin of the insect wing, near the tip.
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http://www.encyclo.co.uk/visitor-contributions.php
Pter`o·stig'ma noun ;
plural Pterostigmata . [ New Latin , from Greek ... wing + ..., ..., a mark.]
(Zoology) A thickened opaque spot on the wings of certain insects.
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http://www.encyclo.co.uk/webster/P/189
A small coloured area near the wing-tip of dragonflies, bees, and various other clear-winged insects: also called the stigma.
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http://www.geog.ubc.ca/biodiversity/efauna/InsectGlossary.html
a dark pigmented spot on the leading edge and towards the tip of the wing in some species of insect.
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https://www.amentsoc.org/insects/glossary/begins/with/p/
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