The Archaeognatha are an order of wingless insects, also known as jumping bristletails. They are among the least evolutionarily changed insects, appearing in the Middle Devonian period along with the arachnids. They are known from both body and trace fossils (the latter including body imprints and trackways) throughout the remainder of the Paleozo...
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http://en.wikipedia.org/wiki/Archaeognatha
(from the article `bristletail`) The oldest known insect fossil for which there is significant remaining structure (head and thorax fragments) is a bristletail (Archaeognatha), ...
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http://www.britannica.com/eb/a-z/a/95
Microcoryphia - an Order of insects within the Apterygota (wingless insects).
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https://www.amentsoc.org/insects/glossary/begins/with/a/
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