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Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Mayflies (Ephemeroptera) » Pisciforma » Heptagenioidea » Flatheaded Mayflies (Heptageniidae) » Epeorus
Photo#64538
mayfly nymph - Epeorus
Copyright © 2006 tom murray

mayfly nymph - Epeorus
Sierra City, Sierra County, California, USA
July 1, 2006
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Contributed by tom murray on 17 July, 2006 - 8:18am
Last updated 17 July, 2006 - 6:20pm

Heptageniidae sp.
Probably an Epeorus.
… Donald S. Chandler, 17 July, 2006 - 2:44pm login or register to post comments

 
Agreed,
Epeorus is most likely, some markings are consistant with E. longimannus, some are not, could be variation or diagnostic for another species. Maybe/maybe not is always so helpful, sorry 'bout that. Two tails (on nymphs) are diagnostic of Epeorus, Pseudocloen and a few Baetidae. The triangular mid-femoral dark markings are also characteristic of Epeorus. When in doubt, ask the trout, the answer will be better than mine. ;)>
… Kerry S. Matz, 17 July, 2006 - 4:38pm login or register to post comments

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