basal streak

Definition

A dark streak, usually found on the forewings of moths in the family Noctuidae, extending from the wing base towards the outer edge, often used for species identification.

Etymology

From 'basal', relating to or forming the base, and 'streak', referring to a long, thin line or mark.

Example

The basal streak on the forewings of the Cabbage Moth helps in distinguishing it from other similar species.

Related Terms

• Forewings
• Noctuidae
• Wing markings

Usage Notes

Basal streaks can vary in size and intensity and are often used in combination with other wing markings for accurate identification of species within the Noctuidae family.