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Insect Order Ephemeroptera (Mayflies)

Taxonomic Navigation -?-
Kingdom Animalia (Animals)
» Phylum Arthropoda (Arthropods)
» Class Insecta (Insects)
» Order Ephemeroptera (Mayflies)
Family in EphemeropteraNumber of SpecimensNumber of Pictures
AmelitidaeBrown Duns429
BaetidaeBlue-Winged Olives56267
BaetiscidaeArmored Mayflies24127
CaenidaeAngler's Curses925
EphemerellidaeHendricksons, Sulphurs, PMDs, BWOs165764
EphemeridaeHexes and Big Drakes47285
HeptageniidaeMarch Browns, Cahills, Quill Gordons122659
IsonychiidaeSlate Drakes20105
LeptohyphidaeTricos427
LeptophlebiidaeBlack Quills and Blue Quills40210
MetretopodidaePseudo-Gray Drakes1038
Neoephemeridae17
PolymitarcyidaeWhite Flies01
PotamanthidaeGolden Drakes00
SiphlonuridaeGray Drakes841

8 families aren't included.
Common Name
MatchCommon Name
****Mayflies
Fly Imitations by Orvis
Pictures Below

This is page 3 of specimens of Ephemeroptera. Visit the main Ephemeroptera page for:

  • The behavior and habitat of Ephemeroptera.
  • 67 underwater pictures of Ephemeroptera.
  • 32 streamside pictures of Ephemeroptera.

516 Mayfly Specimens:

Specimen Page:1234...53
Isonychia bicolor (Mahogany Dun) Mayfly DunIsonychia bicolor (Mahogany Dun) Mayfly DunView 13 Pictures
Region: Upper Midwest
Collected Jun 14, 2005
Added May 26, 2006
Ephemerella subvaria (Hendrickson) Mayfly SpinnerEphemerella subvaria (Hendrickson) Mayfly SpinnerView 11 PicturesI collected this beautiful male Hendrickson specimen as a dun, along with a female Hendrickson from the same hatch. Both molted into spinners in my house within a couple of days.
Region: Northeast
Collected Apr 23, 2007
Added Apr 25, 2007
Isonychia bicolor (Mahogany Dun) Mayfly NymphIsonychia bicolor (Mahogany Dun) Mayfly NymphView 7 PicturesThis Isonychia bicolor nymph from the Catskills displays the prominent white stripe sometimes characteristic of its species. This is the first such specimen I've photographed, because members of the same species in the Upper Midwest have a more subdued stripe (and were once thought to be a different species, Isonychia sadleri). The striking coloration on this eastern nymph is more appealing.
Region: Catskills
Collected Apr 19, 2006
Added Apr 21, 2006
Maccaffertium terminatum Mayfly SpinnerMaccaffertium terminatum  Mayfly SpinnerView 11 PicturesI positively identified this specimen under a microscope with a good key. It was one of the more common species in a generally light mixed bag of mayflies over a big Catskill tailwater last night.

I swooped this one out of the air while it was mating with a female, so I can be certain about her ID as well.
Region: Catskills
Collected Jun 7, 2007
Added Jun 8, 2007
Ameletus ludens (Brown Dun) Mayfly NymphAmeletus ludens (Brown Dun) Mayfly NymphView 9 Pictures
Region: Northeast
Collected Mar 29, 2005
Added Apr 7, 2006
Baetis (Blue-Winged Olives) Mayfly NymphBaetis (Blue-Winged Olives) Mayfly NymphView 10 Pictures
Region: Catskills
Collected May 6, 2007
Added May 18, 2007
Epeorus pleuralis (Quill Gordon) Mayfly SpinnerEpeorus pleuralis (Quill Gordon) Mayfly SpinnerView 10 PicturesA few days earlier I photographed this same specimen as a dun. The changes between dun and spinner seem particularly dramatic in this species.
Region: Northeast
Collected Apr 30, 2007
Added May 3, 2007
Penelomax septentrionalis Mayfly DunPenelomax septentrionalis  Mayfly DunView 10 PicturesI'm pretty sure this dun belongs to septentrionalis, because her legs are just too long for invaria. I know that species is in this system because I collected several nymphs some miles downstream.

This really pretty mayfly was in kind of bad shape when I found it crippled on the surface, and bouncing around in my container with a bunch of green drakes didn't help.
Region: Catskills
Collected Jun 1, 2007
Added Jun 4, 2007
Ephemerella subvaria (Hendrickson) Mayfly DunEphemerella subvaria (Hendrickson) Mayfly DunView 9 PicturesI collected this female Hendrickson dun and a male in the pool on the Beaverkill where the popular Hendrickson pattern was first created. She is descended from mayfly royalty.
Region: Catskills
Collected Apr 19, 2006
Added Apr 22, 2006
Attenella attenuata (Small Eastern Blue-Winged Olive) Mayfly SpinnerAttenella attenuata (Small Eastern Blue-Winged Olive) Mayfly SpinnerView 11 Pictures
Region: Upper Midwest
Collected Jul 1, 2005
Added Apr 22, 2006
Specimen Page:1234...53
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