What characterizes the insects in the order Mecoptera?

Insects belonging to the order Mecoptera, commonly known as scorpionflies, are characterized by having long membranous wings that are typically held outstretched over their bodies when at rest. This distinctive wing structure is a key feature that sets Mecoptera apart from other orders. The wings are not just long but also have a unique shape that aids in their flight and serves as a means of attracting mates during courtship.

While some Mecoptera may exhibit varied diets, including predatory behaviors, they are not primarily herbivorous, which eliminates options that suggest diets or ecological niches not characteristic of the order. Additionally, the lifespans of these insects can vary significantly based on environmental conditions, making the characterization of short lifespans inaccurate. The claim that they lack wings entirely is not true, as the wings are a defining feature of Mecoptera. Thus, the long membranous wings found in this order are crucial for their identification and are central to their biological and ecological characteristics.