How do apterygotes differ from winged insects called pterygotes?

Apterygotes and pterygotes are distinguished primarily by the presence of wings and their developmental processes.

• Wings: Apterygotes are primitive, wingless insects, whereas pterygotes are defined as winged insects, though some members of the Pterygota subclass are secondarily wingless.12
• Metamorphosis: Apterygotes undergo simple metamorphosis, often described as ametabolous, meaning there is little to no change in form from the juvenile stage to the adult. In contrast, pterygotes typically undergo either incomplete (hemimetabolous) or complete (holometabolous) metamorphosis, involving more significant developmental changes.34
• Anatomy: The two groups also differ in the structure of the thorax and the development of abdominal appendages. Furthermore, apterygotes are categorized by their mouthparts—either entognathous or ectognathous—which, along with features like antennae, eye placement, and leg specialization, help differentiate them from pterygote lineages.3