Flight season: late May to mid-August.
Population: not uncommon, but seldom encountered due to its crepuscular habits.
To date known only from this location, several exuviae have been discovered on piers of nearby bridges.
Length: about 50 mm to 55 mm.
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Tweed, Ontario, the Moira River, east of town near Collin's Point:
rock-bottomed river with fast flowing water, rapids and emergent rocks,
the shoreline vegetation consists of wooded areas and clearings supporting tall grasses and wildflowers.
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Immature male Stygian Shadowdragon (Neurocordulia yamaskanensis) –
almost still a teneral and handled with care
(June 02, 2014).
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Immature male Stygian Shadowdragon (Neurocordulia yamaskanensis) –
views of its claspers
(June 02, 2014).
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Tweed, Ontario:
residential and business area.
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Male Stygian Shadowdragon (Neurocordulia yamaskanensis)
June 01, 2016
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Tweed, Ontario, on the pier of the Louisa St. bridge over the Moira River:
rock-bottomed river with a fast current and emergent rocks.
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Teneral female Stygian Shadowdragon (Neurocordulia yamaskanensis) –
the prescence of exuviae on the bridge pier suggested this might be a good place to look for emerging tenerals.
This female was encountered just before her first flight, at 5:10 AM,
and seconds after the pictures were taken she departed
(May 28, 2016).
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