Reflex bleeding in blister beetles (family Meloidae) contains which chemical?

Reflex bleeding in blister beetles (family Meloidae) contains which chemical?

• A. Capsaicin
• B. Formic acid
• C. Hydrogen peroxide
• D. Cantharidin

Answer: (D)

Reflex bleeding in blister beetles is a defensive mechanism that releases cantharidin from their hemolymph when the insect is disturbed. Cantharidin is a blistering toxin produced by these beetles and stored in specialized glands, so when bleeding occurs it coats the attacker and causes painful blisters, deterring further predation. Capsaicin is the spicy irritant from peppers, formic acid is a common ant defense, and hydrogen peroxide is used in various contexts not specific to blister beetle reflex bleeding—none of these are the chemical association for this beetle family.

Reflex bleeding in blister beetles is a defensive mechanism that releases cantharidin from their hemolymph when the insect is disturbed. Cantharidin is a blistering toxin produced by these beetles and stored in specialized glands, so when bleeding occurs it coats the attacker and causes painful blisters, deterring further predation. Capsaicin is the spicy irritant from peppers, formic acid is a common ant defense, and hydrogen peroxide is used in various contexts not specific to blister beetle reflex bleeding—none of these are the chemical association for this beetle family.