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Mayfly Family Ephemerellidae (Hendricksons, Sulphurs, PMDs, BWOs)

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» Family Ephemerellidae (Hendricksons, Sulphurs, PMDs, BWOs)
Genus in EphemerellidaeNumber of SpecimensNumber of Pictures
Attenella417
Caudatella47
Dannella00
DrunellaBlue-Winged Olives37173
EphemerellaHendricksons, Sulphurs, PMDs136627
EurylophellaChocolate Duns22108
Matriella00
Penelomax325
Serratella00
TeloganopsisLittle black Quills16
Timpanoga311

3 genera aren't included.
Common Name
Pictures Below

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

  • The behavior and habitat of Ephemerellidae.
  • 37 underwater pictures of Ephemerellidae.
  • 1 streamside picture of Ephemerellidae.

Pictures of 230 Mayfly Specimens in the Family Ephemerellidae:

Specimen Page:1234...24
Female Ephemerellidae (Hendricksons, Sulphurs, PMDs, BWOs) Mayfly SpinnerFemale Ephemerellidae (Hendricksons, Sulphurs, PMDs, BWOs) Mayfly Spinner View 6 PicturesI'm not sure of the species of this female spinner, and unfortunately I never found the associated males or duns to aid in identification. The egg-laying flight and fall of fairly large clouds of these females caused good rises of choosy trout for a week or so around early July on a large, cold spring creek in the northwoods. There is a distinctive stripe down the female's back, identical to that on this specimen collected a month later.
Collected July 1, 2005 from the Bois Brule River in Wisconsin
Added to Troutnut.com by Troutnut on April 22, 2006
Female Ephemerellidae (Hendricksons, Sulphurs, PMDs, BWOs) Mayfly SpinnerFemale Ephemerellidae (Hendricksons, Sulphurs, PMDs, BWOs) Mayfly Spinner View 7 PicturesThis Ephemerellidae spinner was emerging unusually late, and on a warm stream. Since it's a female, identification is difficult. Her identical coloration suggests she's probably of the same species as this specimen collected on a cool trout stream almost a month earlier.
Collected July 28, 2005 from the West Fork of the Chippewa River in Wisconsin
Added to Troutnut.com by Troutnut on April 14, 2006
Female Attenella margarita (Little Western Blue-Winged Olive) Mayfly DunFemale Attenella margarita (Little Western Blue-Winged Olive) Mayfly Dun View 6 PicturesI found this dun unusually late in the year for anything in the Ephemerellidae family in the East. It's also small for that family.
Collected September 4, 2006 from Willowemoc Creek in New York
Added to Troutnut.com by Troutnut on October 3, 2006
Female Ephemerella (Hendricksons, Sulphurs, PMDs) Mayfly SpinnerFemale Ephemerella (Hendricksons, Sulphurs, PMDs) Mayfly Spinner View 8 PicturesI've seen Ephemerella invaria with green egg sacs and Ephemerella subvaria with yellow one. This one seems too large for dorothea. So what is it? I'm not sure.

Many females of this species were gathered in tight clouds to lay their eggs over the riffles in a mid-sized Pocono stream right at dusk. It would have been a fishable spinner fall if I'd stuck around to wait for them.
Collected May 28, 2007 from Mystery Creek #42 in Pennsylvania
Added to Troutnut.com by Troutnut on June 4, 2007
Male Ephemerella subvaria (Hendrickson) Mayfly DunMale Ephemerella subvaria (Hendrickson) Mayfly Dun View 9 PicturesI collected this male Hendrickson dun and a female in the pool on the Beaverkill where the popular Hendrickson pattern was first created. He is descended from mayfly royalty.
Collected April 19, 2006 from the Beaverkill River in New York
Added to Troutnut.com by Troutnut on April 22, 2006
Ephemerella dorothea dorothea (Pale Evening Dun) Mayfly NymphEphemerella dorothea dorothea (Pale Evening Dun) Mayfly Nymph View 6 PicturesI keyed this nymph carefully under a microscope to check that it's Ephemerella dorothea.
Collected May 29, 2007 from Paradise Creek in Pennsylvania
Added to Troutnut.com by Troutnut on June 4, 2007
Teloganopsis deficiens (Little Black Quill) Mayfly NymphTeloganopsis deficiens (Little Black Quill) Mayfly Nymph View 6 PicturesThis nymph has tiny, barely detectable tubercles (
A few (not all) of the abdominal tubercles on this Ephemerella needhami nymph are circled.  They are especially large in this species.
A few (not all) of the abdominal tubercles on this Ephemerella needhami nymph are circled. They are especially large in this species.
Tubercle: Various peculiar little bumps or projections on an insect. Their character is important for the identification of many kinds of insects, such as the nymphs of Ephemerellidae mayflies.
)
on its abdominal segments, and I could not find the maxillary palpi. I have tentatively guessed that it is Serratella deficiens.
Collected June 9, 2005 from the Bois Brule River in Wisconsin
Added to Troutnut.com by Troutnut on May 26, 2006
Male Ephemerella subvaria (Hendrickson) Mayfly SpinnerMale Ephemerella subvaria (Hendrickson) Mayfly Spinner View 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.
Collected April 23, 2007 from Fall Creek in New York
Added to Troutnut.com by Troutnut on April 25, 2007
Specimen Page:1234...24
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