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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 61 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...606162...84

Male Hexagenia atrocaudata (Late Hex) Mayfly Spinner

View 3 PicturesI found this spinner and a few of his friends bobbing above the river amidst a snowstorm hatch of white Ephoron flies.

Collected August 15, 2004 from the Namekagon River in Wisconsin
Added to Troutnut.com by Troutnut on January 25, 2006

Male Baetidae (Blue-Winged Olives) Mayfly Dun

View 7 Pictures

Collected May 29, 2007 from Brodhead Creek in Pennsylvania
Added to Troutnut.com by Troutnut on June 4, 2007

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

Male Cinygmula ramaleyi (Small Western Gordon Quill) Mayfly Dun

View 8 PicturesThis dun hatched out from a nymph in my aquarium on July 16th, after being collected July 10th. It is probably of the same species as this nymph, and this dun which also hatched from one of these seemingly identical nymphs.

Collected July 10, 2011 from Nome Creek in Alaska
Added to Troutnut.com by Troutnut on July 16, 2011

Male Ephemerella invaria (Sulphur Dun) Mayfly Dun

View 4 Pictures

Collected May 22, 2004 from unknown in Wisconsin
Added to Troutnut.com by Troutnut on January 25, 2006

Male Ephemerella invaria (Sulphur Dun) Mayfly Spinner

View 3 PicturesI caught this one as a dun and he molted into a spinner in my room.

Collected May 27, 2004 from unknown in Wisconsin
Added to Troutnut.com by Troutnut on January 25, 2006

Drunella cornuta (Large Blue-Winged Olive) Mayfly Nymph

View 4 Pictures

Collected May 29, 2007 from Paradise Creek in Pennsylvania
Added to Troutnut.com by Troutnut on June 4, 2007

Female Attenella delantala (Small Blue-Winged Olive) Mayfly Nymph

View 5 Pictures

Collected July 25, 2019 from Mystery Creek #249 in Washington
Added to Troutnut.com by Troutnut on July 26, 2019

Male Epeorus (Little Maryatts) Mayfly Dun

View 7 PicturesThis Epeorus dun managed to emerge successfully even though it had apparently long several legs at some point and only partially grown them back.

Collected May 15, 2007 from the West Branch of the Delaware River in New York
Added to Troutnut.com by Troutnut on May 18, 2007

Male Maccaffertium (March Browns and Cahills) Mayfly Dun

View 6 PicturesI collected this male dun together with a female.

Collected May 27, 2005 from the Namekagon River in Wisconsin
Added to Troutnut.com by Troutnut on May 22, 2006

Specimen Page:1...606162...84

Jargon Defined:

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.

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.

Nymph: 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.