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Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Mayflies (Ephemeroptera) » Pisciforma » Heptagenioidea » Flatheaded Mayflies (Heptageniidae) » Epeorus
Photo#254765
Epeorus grandis - Epeorus
Copyright © 2009 Arlo Pelegrin

Epeorus grandis - Epeorus
Corvallis, Benton County, Oregon, USA
April 12, 2006
Size: 20mm
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Contributed by Arlo Pelegrin on 23 February, 2009 - 5:26pm
Last updated 26 March, 2009 - 1:49pm

Best guess
This could be E. grandis. I'm not very familiar with Western Epeorus species, but the unusual head shape (cf. Fig. 38 of the head capsule in Webb and McCafferty's "Heptageniidae of the World, PT. II," 2008) and the way the first and last gills extend under the abdomen fit well with what little I can find about the nymphs of this species.
… Lloyd Gonzales, 23 March, 2009 - 8:46am login or register to post comments

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