Flight season: late May to mid-July.
Population: uncommon, prefers marshy shorelines of lakes and slow streams
with mud bottoms and floating vegetation, such as the north shoreline of Stoco Lake.
Length about 55 mm.
The pale triangle on the dorsal surface of S8, the high, notched occiput of the female,
and the profile of the male's cerci separate this species from its Arigomphus relatives.
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East of Tweed, Ontario, near intersection of Sulphide Road and the trans-Canada Trail:
vegetated border of the trail, near a sand-bottomed woodland stream, Stoco Lake is not far to the south.
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Immature female Horned Clubtail (Arigomphus cornutus) –
the sides of S8 and S9 will turn a rusty orange color with maturity
(May 24, 2015).
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The prominent occiput, notched in the middle, is visible in the field.
The eyes of mature Horned Clubtails are turquoise
(May 24, 2015).
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The pale triangle on S8 (smaller and less obvious in males)
is absent in other local Arigomphus species and helps separate this dragonfly from its similar cousins
(May 24, 2015).
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If the dragonfly can be captured the subgenital plate is always a reliable characteristic
(May 24, 2015).
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Madoc Township, Ontario, near the intersection of Kellers Bridge Rd. and Freds Dr:
water in a ditch, flowing from a swampy mud-bottomed pond.
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Male Horned Clubtail (Arigomphus cornutus)
Photo by T. Mapes (June 07, 2015)
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East of Tweed, near a bridge on Sulphide Road:
north shore of Stoco Lake, very slow stream supporting little floating and emergent vegetation, stretches of wooded shoreline.
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Aspects of a male Horned Clubtail (Arigomphus cornutus)
June 09, 2016
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A closeup of the terminalia – note the distinctive claspers and the pale streak on S8
(June 09, 2016).
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East of Tweed, Ontario, along Lakeview Lane, near the trans-Canada Trail and Alexander Street:
roadside clearing in shrubbery and woodland supporting tall grasses and wildflowers, a short distance from the Moira River.
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A mature female Horned Clubtail (Arigomphus cornutus), including a photo of the characteristic "horns"
(June 07, 2016).
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