I have observed Horned Clubtail dragonflies (Arigomphus cornutus) - see below) at Quarry Hill Nature Center in Olmsted County. They are approximately 5 cm in length.
I have also recorded the Midland Clubtail (Gomphurus fraternus) in Olmsted county. .They are approximately 5 cm in length.
There are many other species of clubtail dragonflies, but I have not encountered them in Olmsted County.
Horned clubtail
Horned clubtail
Horned clubtail
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The Midland Clubtail (Gomphurus fraternus - see below) is less common in Olmsted County, but I photographed this one at Quarry Hill Nature Center
Midland Clubtail
Midland Clubtail
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I photographed some clubtails in northern Minnesota, the most impressive being the Dragonhunter (Hagenius brevistylus). It is one of the largest dragonflies, measuring approximately 8.5 cm in length. Its name is derived from the fact that it preys upon other dragonflies. I have not observed it in Olmsted County, but the species has been detected in the Twin Cities.
I also photographed the Pronghorn Clubtail (Phanogomphus graslinellus) in northern Minnesota. It is approximately 5 cm long. It has also been recorded in Olmsted county.
Dragonhunter
Pronghorn Clubtail