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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 2 Mayfly Specimens 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 Troutnut.com by Troutnut on July 20, 2011
Epeorus deceptivus Mayfly NymphEpeorus deceptivus  Mayfly Nymph View 4 PicturesIdentification notes from the microscope: Gills on segment 1 extend anteriorly below the body, but not all the way to touching; posterolateral spines minor; femora (
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.
)
without fuscous macula.
Collected August 4, 2020 from Green Lake Outlet in Idaho
Added to Troutnut.com by Troutnut on August 20, 2020

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