One Sunday, the PIP volunteers were doing a program called Meet the Bugs. We brought out a praying mantis, darkling beetles, a wolf spider, and a desert millipede to give visitors a close-up look. The inclusion of the spider and millipede meant “Meet the Invertebrates” would be a more accurate description of the program, but Meet the Bugs is catchier and easier to say.
We also brought out superworms, the legged larvae of darkling beetles (superworms is a misnomer), to provide a before-and-after illustration of insect metamorphosis. The superworms would become beetles, we explained, if they were not eaten by one of the Museum’s turtles first.
Several visitors asked how superworms turned into beetles because they look nothing alike. I compared it to caterpillars turning into butterflies. I hope that was helpful to them, but decided I needed to learn more to provide a better-informed answer next time.
So I googled “darkling beetle metamorphosis” when I got home. There were many results illustrating the pupa stage the beetles go through, comparable to the chrysalis stage for butterflies and the cocoon stage for moths. From viewing the scientific drawings, I realized that I had frequently seen mealworm beetle pupa in the oatmeal-filled drawer where the mealworms are kept without recognizing what they were.
I also found several videos on YouTube of the metamorphosis of darkling beetles. The most interesting was an almost 8-minute video that showed in close-up the larva, pupa, and adult stages of the beetle’s life. My favorite part was watching the legs kicking free of the pupa casing as the adult emerged. The video was a 4th grade class project, part of their habitats unit in science. What a great idea. It gave me a much clearer picture of the process that should help me explain it better to others. Check out the video and see for yourself.