Video – OdoNotations

On Sunday, July 7, 2024 Jeff Skevington, known chiefly for his work on butterflies and flower flies, discovered a first record of dragonfly species for the Ottawa region: a Painted Skimmer (Libellula semifasciata) in Burnt Lands Provincial Park. This species is at the northern edge of its range in southern Ontario, though there is one record from Algonquin Park and one record from Smiths Falls on iNaturalist. This dragonfly has the body of a Four-spotted Skimmer and wing pattern of a Calico Pennant, though the spots are brown instead of red, with a wide amber patch at the base of the wings. The veins at the leading edge of the wings are colourful, too: gold in females and red in males. It is a distinct dragonfly within its range, and outside of it too: Paulson states it is probably migratory in the northern part of its range, and it has been observed moving north over the past 15 years. Perhaps it was only a matter of time before one was seen in Ottawa.

I thought briefly about trying to see the Painted Skimmer the following Saturday, but the forecast, as well as the chances of trying to re-find a bug that had been seen 6 days ago, deterred me: the forecast called for a sunny high of 29°C with the humidity making it feel closer to 40. Burnt Lands Provincial Park is a hot, shadeless alvar better suited for grassland species such as Clay-colored Sparrows than woodland species such as Wood Thrush, and with no trees, running water, or shelter I decided – reluctantly – to head elsewhere, though I would have loved to have seen the Painted Skimmer. It is a species I will have to keep an eye out for while visiting southern Ontario.

I’ve seen large numbers of emeralds (Spiny Baskettails) emerging at Mud Lake and skimmers (species unknown) emerging at Roger’s Pond. These mass emergences were thrilling, but not surprising given how I often I see large numbers of adults of both types of dragonflies feeding together before dispersing – swarms of baskettails flying up and down trails, and large groups of Chalk-fronted Corporals and Dot-tailed Whitefaces resting on various perches close to the water. Clubtails are not usually found in swarms or large groups (they are perchers rather than fliers, so a swarm would be particularly unusual), so I never thought I’d see a large emergence of members of this dragonfly family. That changed with my Canada Day visit to Sheila McKee Park.

The first emerging clubtail caught my eye when I saw what looked like two nymphs on the rocky beach grappling with each other. Closer inspection revealed it to be a nymph trying to break free of its larval shell so it could complete its transformation. It seemed odd to me that it was on the ground – all the baskettails I’ve seen emerging had crawled up onto the branches of the shrubs at the water’s edge, and all of the skimmers had crawled up the stems of the short grassy vegetation lining the trail at Roger’s Pond. The only place I’ve seen clubtail exuviae is on the trunks of the large trees behind the ridge at Mud Lake or on rocks within the water in Gatineau Park. It looked to me that this fellow had walked out of the water and couldn’t wait to get to a safe spot before bursting out of the shell. It was a clubtail, the only nymph I can identify with confidence because it is the only type of dragonfly with widely-separated eyes.

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Transformation

Canada Day Clubtails – Part 2: Emergence