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Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Mayflies (Ephemeroptera) » Pisciforma » Heptagenioidea » Flatheaded Mayflies (Heptageniidae)
Photo#27577
Mayfly
Copyright © 2005 Lynette Elliott

Mayfly
Thompson Falls, Sanders County, Montana, USA
July 26, 2005
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Contributed by Lynette Elliott on 9 August, 2005 - 8:17am
Last updated 27 December, 2008 - 12:03pm

Moved
Thanks Lloyd.
… Lynette Elliott, 9 July, 2008 - 6:27pm login or register to post comments

Heptageniid
If this were an Eastern specimen, my first impression would probably be Maccaffertium. However, that genus is largely absent from the West. The single Maccaffertium species listed for Montana is terminatum terminatum, which would be a whitish imago.

My best guess is that this is probably one of the Rhithrogena species collectively known to fly fishers as the Western March Browns. Given the collection date of your male imago, R. undulata seems like a good possibility. But, keeping in mind that I'm not nearly as familiar with Western species, I think that moving it to family would be the safest thing to do.
… Lloyd Gonzales, 9 July, 2008 - 5:55pm login or register to post comments

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