Author: Jan Scholten
Synonym: Entognatha; Thysanura.
Name: apterous means without wings.
Clades: Insecta; Ecdysozoa; Animals.
Genera: > 5000 species.
Entognatha are ametabolous animals, similar to insects. Their mouthparts are entognathous, retracted within the head.
They are apterous, wingless.
Apterygota were historically united in Thysanura and Apterygota.
They evolved independently from Insecta.
Insecta in the strict sense = Ectognatha = Hexapoda - Apterygota
Insecta = Dicondylia + Archaeognatha.
One can treat Apterygota as part of Insecta. Then Insecta is treated in a broader sense and is similar to Hexapoda.