Question

In Lepidopteran (moths) hind wings, one needle like structure, which hold forewing is known as:

• A. Hypha
• B. Vein
• C. Frenulum
• D. Chaetosemata

Hint:

In moths, the coupling mechanism is Frenate (frenulum on hindwing fits into retinaculum on forewing).
In butterflies, the coupling is Amplexiform (simple overlap of wings with no specialized structures).

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Wing-coupling apparatuses in insects synchronize the movement of forewings and hindwings during flight.

Step 2: Detailed Explanation:
In most moths (Lepidoptera), a frenate type of wing-coupling is present.
A stout, needle-like spine (or a group of bristles) called the frenulum arises from the humeral angle of the hindwing.
This structure projects forward and is held in place by a pocket or catch of scales/hairs called the retinaculum on the underside of the forewing.
This ensures both wings beat in unison.

Step 3: Final Answer:
The needle-like structure is the frenulum, which is option (C).