Oldest fossil considered as Archaeognatha is from the Devonian (390 million years old) from Gaspé, Québec (Labandeira et al., 1988). However, there is little evidence that this fossil is a member of Archaeognatha; it may instead be a member of the stem-group of insects or of stem-Dicondylia.
- Compound eyes enlarged, medially contiguous
- Specialized musculature of abdomen, which allows them to jump by a rapid downward bending
Their abdominal segments bear styles, which are small appendages moveable by muscles. They can be seen underneath the abdomen in the following picture:
Styli may be remnants of ancestral limbs.
Molecular Biology and Genetics
Statistics of barcoding coverage
Specimens with Sequences:369
Specimens with Barcodes:356
Species With Barcodes:20
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