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Archaeognatha
Archaeognatha.jpg
Scientific classification
Kingdom:
Phylum:
Class:
Order:
Archaeognatha

Börner, 1904
Families

Machilidae
Meinertellidae

Archaeognatha is an order of wingless insects, also known as jumping bristletails. They are among those insects which changed least during evolution. They first appear in the Devonian period along with the arachnids (Spiders). The name Archaeognatha is derived from Greek Archaeos meaning "ancient" and gnatha meaning "jaw". This refers to the articulation of the mandibles, which has a single condyle, where all higher insects have two. An alternate name, Microcoryphia comes from the Greek micro meaning "small" and coryphia meaning head.

The Order Archaeognatha has previously been combined with the Order Thysanura, or bristletails. Both groups have three-pronged tails with two cerci and an epiproct. Archaeognatha differ from Thysanura in that they are able to use their tail to spring up to 30 cm into the air. Like Thysanura, the body is covered with scales, with a thin exoskeleton that is susceptible to dehydration.

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