1) Subclass of insecta 
The name Apterygota is sometimes applied to a subclass of small, agile insects, distinguished from other insects by their lack of wings in the present and in their evolutionary history. Their first known occurrence in the fossil record is during the Devonian period, 417–354 million years ago. The nymphs (younger stages) go through little or even...
Apterygota is a subclass of Insecta.
a subclass of the Class Insecta. This subclass contains the Orders of wingless insects.