I might be in the early stages of a love affair…with beetles. A sort of beetle-mania, so to speak. I was aware that there are more species of beetles than plants on our planet, but hadn’t paid any special attention to this group other than occasionally admiring a new one I discovered. But after a couple recent encounters, I’m finding myself growing interested in further study of this very cool group of insects. And since dragonfly season is taking forever to get here, I might as well use this time to get better acquainted with the insects that are already active.
Beetles are in the order Coleoptera, which comes from the Greek words koleos which means sheath (or shield), and ptera which means wings. As this name indicates, they have a hardened pair of forewings called elytra that protect the softer hindwings below.
You may have noticed the common beetle flight style while watching ladybugs; the elytra are lifted up to allow the softer wings below to open. It makes them appear to be somehow handicapped, as if they can’t manage to get those cumbersome appendages out of the way.
It seems that wouldn’t be the most efficient way to fly, but they seem to do just fine. (In fact, I read a study that found that the elytra do provide extra lift in flight, but they reduce aerodynamic efficiency.)
A few days ago I met the pigweed flea beetle; actually I met quite a few of them. I was enjoying a leisurely walk on a quiet trail in one of the less-traveled areas of Magee Marsh Wildlife Area. A half mile from my spot there were throngs of birders jostling for views of a Connecticut warbler, but I was in blissful peace, crouched on the ground watching beetles go about their business.
This particular one taught me something interesting. I watched him (her?) repeatedly open and close the elytra before finally achieving liftoff. I wonder about the purpose of the opening and closing of the elytra so many times; it could be part of a mating display or serve some other function.
Just a few days after being enchanted with the pigweed flea beetle’s display, I’ve met another beetle who taught me more cool stuff. This is the bumble flower beetle (Euphoria inda). Whereas the pigweed flea beetle was about a quarter inch long, this one was much bigger, more than a half inch long. (A quarter inch is significant in the insect world!)
As I was researching this species, I came across an article that claims this one is unique among beetles because he doesn’t raise the elytra when he flies. I haven’t seen reference to this claim to fame anywhere else, but if it’s true, it’s just one more reason to enjoy meeting this magnificent furry creature.
And before you scroll too far, go back and check out those awesome lamellate antennae! Beetles have some of the most interesting antennae I’ve yet come across in my insect studies. I often remember this guy, the big blister beetle I found on my front sidewalk a couple years ago. He’s got those impressive segmented (moniliform) and weirdly-kinked antennae. And his elytra are partially wrapped around his abdomen, in contrast to those of the species above.
Beetles come in all shapes, sizes, and colors, and I look forward to a summer of meeting many more of them and learning more about their fascinating lives!
(Above, clockwise from left: Spotted cucumber beetle, banded longhorn beetle, dogbane leaf beetle)