What structures hold butterfly and moth wings together during flight?

What structures hold butterfly and moth wings together during flight?

• A. Prothoracic legs and tegulae
• B. Frenulum on the hindwing and retinaculum on the forewing
• C. Wing venation patterns
• D. Antennae and proboscis

Answer: (B)

During flight, most Lepidoptera keep their forewings and hindwings aligned with a wing-coupling system. The hindwing carries a small spine called the frenulum that fits into a matching catch on the forewing known as the retinaculum. This connection locks the wings together so they beat as one aerodynamic surface, improving lift and maneuverability. Other features like leg segments or tegulae, wing venation, or mouthparts (antennae and proboscis) play different roles and do not perform the wing-joining function.

During flight, most Lepidoptera keep their forewings and hindwings aligned with a wing-coupling system. The hindwing carries a small spine called the frenulum that fits into a matching catch on the forewing known as the retinaculum. This connection locks the wings together so they beat as one aerodynamic surface, improving lift and maneuverability. Other features like leg segments or tegulae, wing venation, or mouthparts (antennae and proboscis) play different roles and do not perform the wing-joining function.