What is the primary characteristic of insects in the order Embioptera?

Insects in the order Embioptera, commonly known as web-spinners, are primarily characterized by their unique ability to spin silk from specialized glands located in their front legs. This silk production is a distinctive feature that sets them apart from most other insect orders. The silk is used to construct protective shelters or webs, often made in the environment where they live, providing both safety and a conducive space for feeding.

The silk-spinning ability allows Embioptera to create structures that can retain moisture, thereby assisting in their survival and reproductive success. These silk-producing glands and the resulting silk usage are central to the biology of web-spinners, marking a significant adaptation for their ecological niche. This characteristic is fundamental to their identity and functionality as insects within this order.