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Insect Order Ephemeroptera (Mayflies)

Mayflies

Caddisflies

Stoneflies

Taxonomic Navigation -?-

Kingdom Animalia (Animals)

» Phylum Arthropoda (Arthropods)

» Class Insecta (Insects)

» Order Ephemeroptera (Mayflies)

Family in Ephemeroptera
AmeletidaeBrown Duns	0	0
BaetidaeBlue-Winged Olives	0	10
BaetiscidaeArmored Mayflies	0	1
CaenidaeAngler's Curses	0	0
EphemerellidaeHendricksons, Sulphurs, PMDs, BWOs	0	37
EphemeridaeHexes and Big Drakes	0	3
HeptageniidaeMarch Browns, Cahills, Quill Gordons	0	11
IsonychiidaeSlate Drakes	0	0
LeptohyphidaeTricos	0	1
LeptophlebiidaeBlue Quills and Mahogany Duns	0	0
MetretopodidaePseudo-Gray Drakes	0	0
Neoephemeridae	0	0
PolymitarcyidaeWhite Flies	0	0
PotamanthidaeGolden Drakes	0	0
SiphlonuridaeGray Drakes	0	3

8 families aren't included.

Common Name

Match	Common Name
	Mayflies

Pictures Below ↓

This is page 45 of specimens of Ephemeroptera. Visit the main Ephemeroptera page for:

The behavior and habitat of Ephemeroptera.
67 underwater pictures of Ephemeroptera.

Pictures of 828 Mayfly Specimens:

Specimen Page:1...444546...84

Epeorus longimanus (Slate Brown Dun) Mayfly Nymph

View 2 Pictures

Collected June 24, 2005 from the Vermillion River in Montana
Added to Troutnut.com by Bnewell on June 27, 2011

Anafroptilum conturbatum (Tiny Sulphur Dun) Mayfly Nymph

View 2 PicturesA moderately rare mayfly perhaps because the nymphs are fragile that nymphs are usually damaged in collection making identification more difficult.

Collected July 12, 2007 from Bowman Lake in Montana
Added to Troutnut.com by Bnewell on June 26, 2011

Female Isonychia bicolor (Mahogany Dun) Mayfly Nymph

View 2 Pictures

Collected August 24, 2004 from the Beaverkill River in New York
Added to Troutnut.com by Troutnut on January 25, 2006

Male Heptagenia culacantha Mayfly Spinner

View 1 PicturesThis photo was provided by guide Eric Naguski along with the following comments, "I took this photo just upstream of Three Mile Island on the east shore of the Susquehanna River just below where the Swatara Creek enters. The Susquehanna is not an easy river to sample for bugs in my opinion. It is very large and pushes a lot of water. Especially in the spring when you would collect mature culacantha nymphs. And I don't believe that there are a ton of these Heptageniids around. Also the people who are doing most of the sampling like myself are doing so for water quality monitoring work so they only take the specimens down to genus-level taxonomy".

Collected October 22, 2011 from the Susquehanna River in Pennsylvania
Added to Troutnut.com by Entoman on February 10, 2012

Male Ephemerella aurivillii Mayfly Dun

View 7 PicturesThis dun was collected in proximity to this spinner, and to this female that looks like the same species.

Among western species, it most closely resembles Ephemerella aurivillii, of which I reared a specimen from a positively-identified nymph and photographed the male dun previously in Alaska. In the photos, this dun does not seem to have the same evidence of the nymph's dorsal (Dorsal: Top.) stripe, but that's due to the lighting. A faint stripe is apparent under the microscope, as it is in the female linked above.

They do appear to be a bit short for aurivillii, with the male at 8 mm and the female at 9 mm, but the spinners could be a bit longer.

Among the other Ephemerella mayflies documented in Montana, Ephemerella alleni and Ephemerella mucronata are the only two others that seem to not be ruled out.

Collected July 1, 2019 from the Madison River in Montana
Added to Troutnut.com by Troutnut on July 18, 2019

Male Heptagenia adaequata Mayfly Spinner

View 2 Pictures

Collected July 22, 2012 from the Columbia River in Washington
Added to Troutnut.com by Bnewell on July 26, 2012

Male Drunella spinifera (Western Slate Olive Dun) Western Slate Olive Dun Spinner

Male Drunella spinifera (Western Slate Olive Dun) Mayfly Spinner

View 2 Pictures

Collected July 9, 2007 from Fern Creek in Montana
Added to Troutnut.com by Bnewell on June 29, 2011

Caenis youngi (Angler's Curse) Mayfly Nymph

View 2 PicturesThis is probably the most common lake mayfly in western Montana. It can be found with one or more species of Caenis.

Collected July 5, 2007 from Many Lakes in Montana
Added to Troutnut.com by Bnewell on June 26, 2011

Leptophlebia cupida (Borcher Drake) Mayfly Nymph

View 6 Pictures

Collected January 12, 2004 from the Namekagon River in Wisconsin
Added to Troutnut.com by Troutnut on January 25, 2006

Male Ephemera simulans (Brown Drake) Mayfly Dun

View 2 Pictures

Collected July 11, 2009 from Flathead Lake in Montana
Added to Troutnut.com by Bnewell on June 27, 2011

Specimen Page:1...444546...84

Jargon Defined:

Dorsal: Top.

Dun: Mayflies have two adult stages. They first emerge from the water as duns (scientifically known as the subimago stage). They then molt into the spinner (imago) stage, in which they mate and die. Sometimes the word "dun" is confusingly used to refer to a brownish gray color in fly tying materials.

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).

Spinner: There are two winged stages of adult mayflies. They emerge from the water as duns, molt on land (usually) into their fully mature stage, spinners. As spinners, they mate, lay eggs, and die.