The Pterygota are a subclass of insects that includes the winged insects. It also includes insect orders that are secondarily wingless (that is, insect groups whose ancestors once had wings but that have lost them as a result of subsequent evolution). The pterygotan group comprises almost all insects. The hexapod orders not included are the Archae...
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http://en.wikipedia.org/wiki/Pterygota
[genus] Pterygota has a pantropical distribution. Species include ...
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http://en.wikipedia.org/wiki/Pterygota_(genus)
(from the article `insect`) Figure 1 is a simplified family tree of the presumed evolutionary history of winged insects (Pterygota) throughout the geological periods from the ...
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http://www.britannica.com/eb/a-z/p/129
Pterygota is a two (some say three) division subclass of Insecta, all members of which undergo metamorphosis, whether slight and incomplete or pronounced and complete. In the first division (Hemimetabola) are the cockroaches, locusts, earwigs, lice, termites etc. In the second division (Holometabola) are the members which undergo a pronounced and c...
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http://www.probertencyclopaedia.com/browse/BPA.HTM
the name given to the Subclass of insects that possess wings.
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https://www.amentsoc.org/insects/glossary/begins/with/p/
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