pterostigma
A pterostigma is a thickened, often colored, cell or patch found near the tip of the wings of insects, particularly in dragonflies and damselflies, but also present in some other insect orders like Hymenoptera. It is a diagnostic feature used in insect identification and taxonomy. The pterostigma is typically rhombus-shaped and covers a portion of both the costa and subcosta veins.
The exact function of the pterostigma has been a subject of scientific inquiry. Current research suggests it
The coloration of the pterostigma can vary greatly between species and even within different sexes or age