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Apterygota Definition from Science & Technology Dictionaries & Glossaries
Subclass of the insects including the most primitive orders with no metamorphosis. Except for the size, all larval stages closely resemble the adults (which are wingless).
Apterygota Definition from Encyclopedia Dictionaries & Glossaries
The name Apterygota is sometimes applied to a subclass of small, agile insects, distinguished from other insects by their lack of wings in the present and in their evolutionary history. Their first known occurrence in the fossil record is during the Devonian period, 417-354 million years ago.
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