How many main costal leading veins do subs have on their wings?

In the context of entomology, specifically the anatomy of insect wings, the term "main costal leading veins" refers to the significant veins running along the leading edge of the wings. For many insects, including certain families of butterflies and moths, there are generally two main costal leading veins. These veins contribute to the structural integrity of the wing and play a critical role in wing movement and aerodynamics.

The presence of two main costal leading veins is consistent with the wing patterns observed in a variety of winged insects, which aids in their identification and classification. Thus, recognizing that two leading veins are a common feature in many insect wings highlights the importance of this anatomical trait in entomological studies.