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Mayfly Species Epeorus deceptivus

Pictures Below
This western species distribution somewhat overlaps both Epeorus longimanus and Epeorus albertae and they often occur together. This species is not as common or important.  

Where & When

Region: West

Time Of Year (?): July through early October

Preferred Waters: Fast, cold, mid-size rivers

Altitude: Above 5,000 feet

Hatching Behavior

Habitat: Slow water near the nymphs' fast-water habitat

Pictures of 1 Mayfly Specimen in the Species Epeorus deceptivus:

Epeorus deceptivus Mayfly NymphEpeorus deceptivus  Mayfly Nymph View 8 PicturesGills #1 failing to meet at the center sterna combined with a lack of small dark single spots mid-femur (
The femur of this Isonychia bicolor mayfly spinner is highlighted in red.
The femur of this Isonychia bicolor mayfly spinner is highlighted in red.
Femur: The main segment of an insect's leg close to the body, in between the tibia and the trochanter.
are characters that differentiate Epeorus deceptivus from Epeorus longimanus.
Collected July 17, 2011 from the Gulkana River in Alaska
Added to by Troutnut on July 20, 2011

Recent Discussions of Epeorus deceptivus

Just wondering about this one Epeorus larval 6 Replies »
Posted by Brookyman on Jan 15, 2013
Last reply on Jan 16, 2013 by Brookyman
Hey everybody I just did a color illustration of Epeorus longimanus based on a sample from the biodiversity group collection @ the university of Guelph. This one bares a big resemblance to that sample.
This one seems more transperent but it is a living sample, and the ones on the site are in preservative.
The median posterial terga bands and the head capsule shape is what made me think this maybe E. longimanus.

Just wondering if this is E. longimanus and if so can it be label it as such ???

Here is the sample I worked off of.


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