Mayfly Species Epeorus deceptivus

Mayflies

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Stoneflies

Taxonomic Navigation -?-

Kingdom Animalia (Animals)

» Phylum Arthropoda (Arthropods)

» Class Insecta (Insects)

» Order Ephemeroptera (Mayflies)

» Family Heptageniidae (March Browns, Cahills, Quill Gordons)

» Genus Epeorus (Little Maryatts)

» Species 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 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.

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 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.

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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Jargon Defined:

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.

Nymphs: The juvenile, underwater stages of mayflies, stoneflies, dragonflies, and damselflies and other aquatic insects whose juvenile stages are covered by hard exoskeletons. The word can also refer to the fishing flies which imitate these creatures, in which case it is used as a blanket term for flies imitating any underwater stage of an invertebrate (except for crayfish and leeches).

Useful References:

Arbona, Fred Jr. 1989. Mayflies, the Angler, and the Trout. Nick Lyons Books.

Caucci, Al and Nastasi, Bob. 2004. Hatches II. The Lyons Press.

Knopp, Malcolm and Robert Cormier. 1997. Mayflies: An Angler's Study of Trout Water Ephemeroptera . The Lyons Press.

Swisher, Doug and Carl Richards. 2000. Selective Trout. The Lyons Press.