07/25/2019
Our Latest Nature Blog
July 23, 2019 Franklin
There he was, his iridescent colors sparkling in the sunlight as he perched on a twig over the clear stream water. The upright velvet black wings and metallic marine blue of the slender damselfly captured my attention as we shared that cool shady spot, and I was honored to be in the presence of an ebony jewelwing.
Damselflies are also called snake doctors, devil's darning needles, damsels, and bog dancers. They are in the same scientific order Odonata as dragonflies, and many of their general features and lifestyle patterns are similar. The easiest distinguishing differences are in their wings, their eyes, and their bodies. A damselfly at rest holds its wings in a vertical position, unlike the dragonfly wings which are positioned horizontally. Damselflies have eyes that are far apart with space between, and their bodies are slender. Dragonflies, on the other hand, have huge eyes that actually touch, filling the entire face, and their bodies are bulky, lacking the trimness of the damselfly physique.
Both of these magnificent insects are survivors. They have been present on earth for eons of time. Fossil evidence proves that they were here during, and even before, the dinosaurs, and their preserved forms show that when they inhabited the dinosaur realm they had the wingspan the same as that of hawks today.
Damselflies are found on all of the continents, except Antarctica. They most often are seen around freshwater areas-marshes, streams, ponds, and lakes. Water is necessary for damselfly reproduction, so it's logical that this is where they live.
After mating, the male damselfly stays with the female, protecting her as she goes underwater to lay her eggs on the stem of a water plant and sometimes helping her emerge from the water. The eggs will hatch in one to three weeks, resulting in a creature that looks nothing like an adult damselfly.
Damselflies develop through a cycle known as incomplete metamorphosis, three stages of growth with each being different from the others. The first stage, obviously is the egg, which hatches into a nymph, sometimes called a larva or naiad.
This second stage of life is lived exclusively in the water environment. The damselflies in this stage are a brownish color with three gills that look like feathers extending from the posterior.The nymphs are carnivorous, meat eaters, feeding on smaller insects and other animals in their body of water. Depending on the species, the damselfly is in the nymph stage from two months to three years, molting five to fifteen times. In essence the majority of the damselfly's life is lived here, a voracious hunter of the underwater world.
Once the final molting time has arrived, the nymph crawls up a water plant stem. The exoskeleton splits for the last time, and the adult form emerges. The gills have been replaced with lungs, called spiracles, located in the abdomen. Fluids have to be pumped through the wings and body, and usually within thirty minutes the beautiful adult flits away in the sunlight. Their adult life lasts from a few days to several months, at the end of which they mate, lay eggs, and then die.
Damselflies are important parts of freshwater ecosystems. They are fierce predators of harmful insects, such as mosquitoes and flies, and they sometimes eat beetles and moths.
These slender flyers, along with their dragonfly relatives, are also used as indicators of water quality. Both are found where the water quality is good, as neither they nor their nymph offspring can thrive in polluted water or where the waterside vegetation is not healthy.
Preserving natural and man-made water sources, like marshes, streams, ponds, and lakes, is crucial to the survival of these outstanding water dancers. Damselflies survived what the dinosaurs couldn't. In our human greed and arrogance, let's not do them in now.
For more information about these unique insects, check out these web sites.
https://www.insectidentification.org/insect-description.asp?identification=Ebony-Jewelwing-Damselfly
https://aggie-horticulture.tamu.edu/galveston/beneficials/beneficial-12_damselflies.html
https://www.britannica.com/animal/damselfly
https://www.dragonfly-site.com/damselfly.html
http://www.cirrusimage.com/damselfly.html
This page details the Ebony Jewelwing including size, territorial reach and pictures.