Wheel Bug (Arilus cristatus)

One of the strangest-looking insects is the Wheel Bug (Arilus cristatus). Classified as members of the "assassin bug" family, they are good at camouflaging themselves and waiting for other bugs to ambush. Their preferred meals are soft-bodied insects such as moths, caterpillars, certain beetles, etc. They use their strong front legs to pin their prey while stabbing it with the long proboscis. Enzymes are injected into the prey to soften the insides, which are then sucked out.


The cog-like wheel on their back is a formidable-looking piece of armor, but entomologists are uncertain whether the wheel-like structure actually serves a defensive purpose or not. It might simply be a visual deterrent to predators. The creature also has scent glands in its abdomen which can emit an unpleasant odor if threatened or disturbed. This odor is similar to that of the Stink Bugs, but not as potent.


This bug is not harmful to humans, especially if left alone, and will generally avoid humans. If provoked, however, their bite can be rather painful, more so than a wasp's sting and can be problematic for several days, or even weeks. Gardeners and farmers should delight in seeing this insect, as it is a sign of a healthy ecosystem, and Wheel Bugs eat many predators of crops and flowers. Have you seen one of these critters in your garden?