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Insect Order Ephemeroptera (Mayflies)



Pictures Below ↓

This is page 48 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...474849...84
Siphlonurus autumnalis (Gray Drake) Mayfly NymphSiphlonurus autumnalis (Gray Drake) Mayfly Nymph View 1 Pictures
Collected August 31, 2007 from Crazy Beaver Spring in Montana
Added to Troutnut.com by Bnewell on June 28, 2011
Cinygmula (Dark Red Quills) Mayfly DunCinygmula (Dark Red Quills) Mayfly Dun View 1 Pictures
Collected April 29, 2006 from Boiling Springs Creek in Montana
Added to Troutnut.com by Bnewell on June 28, 2011
Male Rhithrogena morrisoni (Western March Brown) Mayfly AdultMale Rhithrogena morrisoni (Western March Brown) Mayfly Adult View 1 Pictures
Collected May 2, 2011 from the Touchet River in Washington
Added to Troutnut.com by Bnewell on June 27, 2011
Female Tricorythodes (Tricos) Mayfly SpinnerFemale Tricorythodes (Tricos) Mayfly Spinner View 7 PicturesThis Trico was alive in the photos but didn't pose well.
Collected September 8, 2006 from the Neversink River in New York
Added to Troutnut.com by Troutnut on October 4, 2006
Male Ameletus vernalis (Brown Dun) Mayfly DunMale Ameletus vernalis (Brown Dun) Mayfly Dun View 1 Pictures
Collected April 29, 2012 from the Touchet River in Washington
Added to Troutnut.com by Bnewell on April 30, 2012
Cinygmula reticulata (Western Ginger Quill) Mayfly NymphCinygmula reticulata (Western Ginger Quill) Mayfly Nymph View 1 PicturesI collected several live specimens of nymphs and reared them to the imago (Imago: The sexually mature adult stage of the mayfly is called the imago by scientists and the spinner by anglers.) stage. They were C. reticulata. The interesting thing is they were collected in May and were emerging along with Rhithrogena (March Brown). This seems to be an overlooked hatch since in some rivers it emerges very early, before runoff.
Collected May 10, 2009 from the Big Thompson River in Montana
Added to Troutnut.com by Bnewell on June 26, 2011
Female Ameletus oregonensis (Brown Dun) Mayfly SpinnerFemale Ameletus oregonensis (Brown Dun) Mayfly Spinner View 1 Pictures
Collected June 20, 2012 from the Touchet River in Washington
Added to Troutnut.com by Bnewell on June 21, 2012
Neoephemera Mayfly NymphNeoephemera Mayfly Nymph View 7 PicturesThis specimen was sent to me for identification by Caleb Boyle, who did such a good job taking pictures of his mystery mayfly that, after identification, I asked him for permission to add it to this site, which he granted. This is great luck, since Neoephemera is a rare mayfly and it's unlikely I would ever have collected a specimen for the site myself.

Caleb collected it in mid-late May of 2004 either McDowell County or Ashe County in North Carolina, in a riffle less than two feet deep in a cold trout stream. He reared the nymph into a dun, whose wings appear in one of the photos below. He describes the specimen as follows:

Nymph exoskeleton:
Body: 16-17mm
Tails: 3, equal length, 13mm
Found on the surface of the water. The gill cover covers ab. segments 3-5.

Subimago (Subimago: Mayfly nymphs emerge from the water into subimagoes, better known to anglers as "duns." They are a sexually immature, winged, recognizably adult stage and they must molt one more time into imagoes or "spinners" before they can mate.):
Body: 16mm, dark brown/ olive
Tails: 3, equal length, 14mm
Wings: dark slate color, large hind wings.


I don't know to which species it belongs, but its size rules out the most common one in the genus, Neoephemera bicolor. It matches the size of Neoephemera purporea so that is a likely other possibility, but there are two other candidate species (Neoephemera compressa and Neoephemera youngi) about which I have no information, so I can't rule them out.

Disregard the camera, region, and exact date listed on these photos. I still need to update the site to accommodate user contributions which don't use my equipment.
Collected May 20, 2004 from unknown in North Carolina
Added to Troutnut.com by Troutnut on March 20, 2007
Ephemerella excrucians (Pale Morning Dun) Mayfly NymphEphemerella excrucians (Pale Morning Dun) Mayfly Nymph View 5 Pictures
Collected June 16, 2018 from the South Fork Snoqualmie River in Washington
Added to Troutnut.com by Troutnut on June 18, 2018
Rhithrogena Mayfly NymphRhithrogena Mayfly Nymph View 1 PicturesBased on the lack of coloration and the two bars on the last tergite (
One tergite of this Isonychia bicolor mayfly spinner is highlighted in red.
One tergite of this Isonychia bicolor mayfly spinner is highlighted in red.
Tergite: The top (dorsal) part of a single segment on an insect's abdomen when it consists of a single chitinous plate (sclerite), or an individual sclerite if the segment has more than one.) this may be Rhithrogena virilis.
Collected May 12, 2005 from Hungry Horse Creek in Montana
Added to Troutnut.com by Bnewell on June 28, 2011
Specimen Page:1...474849...84
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