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Home » Guide » Arthropods (Arthropoda) » Insects (Insecta) » Mayflies (Ephemeroptera) » Stream Mayflies (Heptageniidae) » Epeorus
Photo#419680
Ephemeroptera: Heptageniidae: Epeorus - Epeorus
Copyright © 2010 josephfortier

Ephemeroptera: Heptageniidae: Epeorus - Epeorus
Keller, Ferry County, Washington, USA
June 29, 2010
Size: 8mm w/out cerci
Specimen found in first-order stream riffle. Note large ventral extensions of first pair of gills (pointer) and posterior-most gills curved inward (ventral view). Setae in anterior area of head point postero-medially. Is this subgenus Causasiron?

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Ephemeroptera: Heptageniidae: Epeorus - Epeorus Ephemeroptera: Heptageniidae: Epeorus - Epeorus
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Contributed by josephfortier on 1 July, 2010 - 1:03am
Last updated 2 July, 2010 - 4:10am

Moved
Moved from ID Request.
… Roger Rohrbeck, 2 July, 2010 - 4:11am login or register to post comments

Is this subgenus Causasiron?
No, Epeorus subgenus n. Caucasiron, as described by Dr. Nikita J. Kluge in his 1997 paper, New subgenera of Holarctic mayflies (Ephemeroptera: Heptageniidae, Leptophlebiidae, Ephemerellidae), has a distribution limited to Caucasus and Middle Asia.

Ferry County (WA) has records of Epeorus albertae, E. deceptivus, E. grandis, and E. longimanus. I believe your photos to be of either E. grandis, or E. longimanus, and am leaning toward the latter.
… Roger Rohrbeck, 2 July, 2010 - 4:06am login or register to post comments

 
Thank you.
I saw that paper also, and wondered whether I had found a new record for North America! Thanks for this info.
… josephfortier, 2 July, 2010 - 10:06pm login or register to post comments

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