Sigh. And sigh again. Happy sighs are these. Because . . . the dragonflies are transforming from their aquatic form to flyers. In either lifestyle, they are predators, but it’s the latter flyer that we appreciate the most. Especially during years like this when the Black Fly and Mosquito populations are prolific. We give thanks, of course, for such prevalence, because these little stinging fliers become odonata and amphibian and bird food, or so we like to pretend that we give thanks. Really, we’re grateful for the insistent buzzing and biting, but even more grateful for those who predate upon them.
The exciting thing about this week is that several of us had the great opportunity to spy some dragonflies eclosing, the act of emerging from their larval forms. So here’s the deal: fully developed aquatic larvae, aka nymphs, crawl out of the water onto emergent grasses, sedges, shrubs, and rocks, split the back of their skin and emerge as winged adults like the one in view here.
Newly eclosed dragonflies lack pigment so identifying them isn’t always easy. Of even more importance, they are extremely vulnerable to predation as they clutch their old skin while pumping air into their bodies and liquid into their expanding wings. One way to note an emergent adult is by the cloudiness of the wings as they set their internal systems in motion. The tough part is that they must wait in this position, unable to escape predators, until wings dry and they can fly. The process can take several hours.
And so it was with great glee that we noticed wee, yet mature Hudsonian Whiteface dragonflies, members of the Skimmer family, flying and posing, flying and posing.
The yellow spot on segment seven (dragonfly abdomens consist of ten segments) is triangular in shape, aiding in the identification as I get my dragonfly eyes back on.
In no time, it seemed, there were dragonflies everywhere. Well, not everywhere for I traveled several trails and realized that those who were emerging tended to be near stiller waters. The Common Baskettail, as this species is known, is a member of the family Corduliidae (the Emeralds). Unlike other Emerald family members, baskettails lack the green eyes, though as they age the color does change. But they make up for it by being super hairy. As a naiad, the hair apparently traps tiny pieces of debris, thus hiding it from predators in the muck. In its adult form, the hair serves as a spring jacket, holding in heat.
All that is fine and well and there will be many more odonata references during the next six months as I wonder my way. but today I happened upon one who added to my knowledge bank and I’ll forever celebrate this opportunity to learn more. Do you see the neon green appearing to drip off the wings?
Look closely at the left behind aquatic structure, aka exuvia or cast skin, and you can see the length of the former nymph that helps define this species to family based on its shape: Darner.
Though I first thought this specimen was dead, suddenly it walked along the underside of an old stump beside the water. Try as I could to separate its wings, I was unsuccessful. For some reason they were stuck together. And one was even folded still as it would have been upon first emerging, thus there was green at its tip, though it appeared at first glance to be in the middle of the wing.
Based on the fact that its thorax stripes were already taking on its adult colors, I knew this darner had been trying to reach flight stage for hours. What had gone wrong? What was the neon green? Something must have gone astray as this dragonfly tried to pump hemolymph (Insect fluid like blood) through to its wings to stiffen them for flight.
Hemolymph is made up of water and other characteristics like carbohydrates and amino acids, and also pigments, though the latter are typically clear but may be tinged with yellow or green. In the case of this darner, it seems that green is the color of choice. Had it been able to expand its wings, the fluid would have drained out of the wings and back into the body. Usually, it takes about an hour or more for the wings to reach full length and they have a cloudy appearance as the fluid is pumped into them. They are held together over the back, much like a damselfly, but once the fluid drains out of them, the dragonfly is able to extend the wings and there’s a shiny glint to them until they fully dry and stiffen. And then, in a split second, when one such as me is watching, flight happens.
For some reason, this darner will not know flight, but I gave thanks for the opportunity to see its blood and slow my brain down to think about the process.
To fly or not to fly?: it’s a complicated question.