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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
Attenella528
Caudatella47
Dannella00
DrunellaBlue-Winged Olives28124
EphemerellaHendricksons, Sulphurs, PMDs128571
EurylophellaChocolate Duns22108
Matriella00
Penelomax325
Serratella11
Teloganopsis16
Timpanoga12

3 genera aren't included.
Common Name
MatchCommon Name
****Hendricksons, Sulphurs, PMDs, BWOs
Pictures Below ↓

This is page 5 of specimens of Ephemerellidae. Visit the main Ephemerellidae page for:

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

Pictures of 206 Mayfly Specimens in the Family Ephemerellidae:

Specimen Page:1...456...22
Ephemerella aurivillii Mayfly NymphEphemerella aurivillii Mayfly Nymph View 7 Pictures
Collected May 10, 2008 from the Chena River in Alaska
Added to Troutnut.com by Troutnut on April 20, 2011
Male Ephemerella aurivillii Mayfly DunMale Ephemerella aurivillii Mayfly Dun View 14 PicturesThis is the most widespread species of Ephemerella, and also the most abundant in some places, but nobody I've talked to seemed to know what its duns looked like, and there were no pictures of its duns online or in any angling books. That mystery is solved with this male dun, which hatched from a definitively identified nymph.
Collected July 10, 2011 from Nome Creek in Alaska
Added to Troutnut.com by Troutnut on July 12, 2011
Ephemerella aurivillii Mayfly NymphEphemerella aurivillii Mayfly Nymph View 9 PicturesI'm pretty sure this is Ephemerella aurivillii. The body is 11mm long, which rules out most other species, and the hind legs seem to be more than 1.5 times longer than the fore legs -- a key characteristic for this species.

This specimen isn't in the best of shape, as it's missing all three tails, but it's the only one of its species I captured in this sample.
Collected May 6, 2007 from Mongaup Creek in New York
Added to Troutnut.com by Troutnut on May 18, 2007
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
Male Ephemerella subvaria (Hendrickson) Mayfly DunMale Ephemerella subvaria (Hendrickson) Mayfly Dun View 5 Pictures
Collected May 1, 2004 from the Namekagon River in Wisconsin
Added to Troutnut.com by Troutnut on January 25, 2006
Ephemerella needhami (Little Dark Hendrickson) Mayfly NymphEphemerella needhami (Little Dark Hendrickson) Mayfly Nymph View 5 PicturesI took quite a few notes at the microscope when I collected this specimen. They're attached to the appropriate pictures.

I found this specimen in the same collection as a similar one. Since I only have strange views of this one, it's possible that they're actually the same specimen and I somehow confused my picture-ordering and got the impression that they're different nymphs.
Collected June 8, 2005 from the Namekagon River in Wisconsin
Added to Troutnut.com by Troutnut on May 26, 2006
Male Ephemerella subvaria (Hendrickson) Mayfly DunMale Ephemerella subvaria (Hendrickson) Mayfly Dun View 4 Pictures
Collected May 1, 2004 from the Namekagon River in Wisconsin
Added to Troutnut.com by Troutnut on January 25, 2006
Ephemerella aurivillii Mayfly NymphEphemerella aurivillii Mayfly Nymph View 3 PicturesThis specimen seems to be morphologically identical to the darker specimens of its species, but it's a very distinctly different color. I'm guessing this is a gender difference, just as I've guessed for the similar E. subvaria nymphs.
Collected February 5, 2004 from unknown in Wisconsin
Added to Troutnut.com by Troutnut on January 25, 2006
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
Ephemerella invaria (Sulphur Dun) Mayfly NymphEphemerella invaria (Sulphur Dun) Mayfly Nymph View 4 Pictures
Collected March 13, 2005 from Cascadilla Creek in New York
Added to Troutnut.com by Troutnut on April 5, 2006
Specimen Page:1...456...22
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