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Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Mayflies (Ephemeroptera) » Pisciforma » Heptagenioidea » Flatheaded Mayflies (Heptageniidae)
Photo#214497
Mayfly
Copyright © 2008 Lynette Elliott

Mayfly
Thompson Falls, Sanders County, Montana, USA
August 13, 2008
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Contributed by Lynette Elliott on 15 August, 2008 - 11:15pm

Heptagenia adaequata
Based on Webb and McCafferty 2008 figure 198 I would say Heptagenia adaequata. The tergite markings fit but most important is the distinct point on the bridge of the clypeus, but the lateroparapsidal blackish markings slightly forward-lateral to the scutellum. Heptagenia is the genus and adaequata is very likely just the scutellum is a little dark.

Mack.
… The Stenonema Rangers of Ontario, 9 April, 2017 - 7:41pm login or register to post comments

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