I wasn’t surprised when I caught my first Familiar Bluet, a species I had photographed here before and identified with the help of some friends on the Northeast Odonata Facebook page.
The Familiar Bluet has a pale tubercle at the tip of its cercus (the upper appendage) and a dark “arm” that extends above the tubercle. These structures showed up quite well in one close-up photo:
The Familiar Bluet is one of the most common and widespread damselflies in North America. It breeds in a variety of still and slow-moving water habitats, including slow-flowing streams, marshes, vegetated lakes and ponds, and even river edges with emergent vegetation. Its range extends across the U.S. and into southern Canada from Newfoundland to BC. As it can tolerate different environmental conditions, including saline waters, it often quickly colonizes newly created wetlands. It is not surprising that this species moved into the reconstructed storm water ponds so soon after they refilled with water a couple of months ago.
I wasn’t expecting to find more than one species at the ponds, but when I caught a bluet whose appendages looked a little bit different I suspected I had a Tule Bluet, and once again the Northeast Odes group confirmed my suspicions.
The Tule Bluet is quite similar in appearance to the Familiar Bluet, though the Familiar Bluet is said to be paler and bluer in general – the Tule Bluet may look greenish compared to Familiar Bluet. From above, the black markings on the abdominal segments are longer than those of the Familiar Bluet, particularly in the middle segments. While the black markings look like thin rings on the Familiar Bluet, they extend to about one-half of each segment on the Tule Bluet. Of course, the abdominal pattern is variable among individuals, so this is not a reliable field mark for identification.
Once again a close-up view of the terminal appendages is required for identification. The male Tule Bluet also has a pale tubercle at the tip of its cercus, though it has dark arms both above and below the tubercle, which extends beyond the cercus itself. The tubercle of the Familiar Bluet does not extend beyond the cercus.
The Tule Bluet has a range that extends across the U.S., except in the southeast, and in southern Canada from Nova Scotia to BC. It, too, inhabits marshes, ponds, lakes, and open waste water ponds, though it doesn’t particularly matter if a wetland is well- or sparsely vegetated. This is the first time I can recall seeing one away from the Ottawa River.
Here are a few other bluets I photographed, though I wasn’t able to get a good, sharp image of the appendages on any of them. The deep blue colour, however, and the thin black rings in the middle of the abdominal segments make me think these are all Familiar Bluets. I suspect this species outnumbers the Tule Bluets at these ponds, as I was able to identify a few Familiar Bluets in the hand and only one Tule Bluet during my time there.
It was great to be able to finally put names to these small black and blue fellows. I can’t wait to return next summer and see what else may be flying in the newly reconstructed ponds – hopefully the Fragile Forktails and Rainbow Bluets I saw a few years before construction began are still there, and hopefully some new species will show up too!