Wings with predominantly longitudinal neuration, covered with flattened scales.
Apart from this feature the Trichoptera also differ from the typical Neuroptera in the relatively simple, mostly longitudinal neuration of the wings, the absence or obsolescence of the mandibles and the semi-haustellate nature of the rest of the mouth-parts.
In the form of the feelers, the wing-neuration and minor structural details there is much diversity among the saw-flies.
Needham the wing-neuration in this order is the most primitive to be found in the Hexapoda.
How would you define neuration? Add your definition here.