Flight season: mid June to late August.
Population: uncommon, sole encounter with this species to date.
Can be found at virtually any habitat but prefers quiet forest streams
or clear lakes.
Length: about 55 mm to 60 mm.
Separated from other Somatochlora species by its markings and cerci (or ovipositor in the case of a female).
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Tweed, Ontario, near the intersection of Victoria St. and Spring St:
residential and business area.
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Immature male Williamson's Emerald (Somatochlora williamsoni) –
a victim of vehicular traffic, quite lively and difficult to capture
when first encountered, but unfortunately the dragonfly eventually perished
(July 12, 2012).
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West of Tweed, Ontario, along the trans-Canada Trail:
a high and dry field with sandy soil, supporting drought tolerant low grasses and wildflowers, Sweetfern, Rubus spp,
Staghorn Sumac and Eastern Red Cedar.
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Female Williamson's Emerald (Somatochlora williamsoni) –
a young individual, the bright colors and clear markings on its body will become obscured with age.
The thorax bears a yellow stripe and a spot, the abdomen has a spot at the base of each segment.
These emeralds are probably breeding in the marsh to the south of the field
(June 13, 2015).
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The triangular subgenital plate is very slender, with a distinctly pointed tip
(June 13, 2015).
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West of Tweed, Ontario, a high and dry field along the trans-Canada Trail:
a dry field with sandy soil supporting short drought tolerant grasses, Sweetfern and Rubus spp.
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Female Williamson's Emerald (Somatochlora williamsoni) –
an old dragonfly with obscured markings
(August 01, 2015).
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