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Oil Beetle

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description Oil Beetle Overview

Oil beetles are a group of flightless insects belonging to the genus Meloe, which is part of the blister beetle family Meloidae. They are known for secreting an oily substance containing cantharidin, a toxic chemical used as a defense mechanism against predators. Their larvae undergo a specialized phoretic stage, climbing onto flowers to attach themselves to solitary bees, which transport them back to the bees' underground nests where they feed on bee provisions and eggs. These beetles are typically found in undisturbed habitats.

help Oil Beetle FAQ

Why do oil beetle larvae climb onto flowers?

Newly hatched larvae, called triungulins, climb vegetation and wait for visiting solitary bees. They grip a bee's hairs and hitch a ride to its nest, where they consume the stored provisions and often the bee's egg.

Can an oil beetle burn human skin?

Oil beetles contain cantharidin, the blistering chemical associated with the beetle family Meloidae. Handling or crushing one can release the chemical and cause painful skin irritation, so the safest response is to leave it untouched.

Why do oil beetles have such short wing covers?

Adult Meloe are flightless, and their reduced elytra do not cover the large abdomen. Their larvae depend on bees for transportation, while the heavy adults usually walk among low plants and flowers.

Are oil beetles parasites of honey bees?

Their life cycle is mainly associated with solitary bees rather than colony-forming honey bees. A larva reaches an underground nest by phoresy, then develops using the food that the female bee collected for her own offspring.

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