The Dicondylia are a taxonomic group (taxon) that includes all insects except the jumping bristletails (Archaeognatha).
They have a continuous occipital seam, and a further joint between the upper and lower limbs.
[4] At the base of the oviposition tube (ovipositor), there is an additional sclerite, the gonangulum, which allows for the improved coordination of the movement of the gonapophyses.
In addition, all these insects ancestrally have a five-membered tarsus[4] and styli are present at their maximum at the two last abdominal segments.
The Dicondylia includes all of the winged and secondarily wingless insects (Pterygota), along with the Zygentoma (silverfish, etc.)