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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
Attenella739
Caudatella47
Dannella00
DrunellaBlue-Winged Olives51271
EphemerellaHendricksons, Sulphurs, PMDs155756
EurylophellaChocolate Duns22108
Matriella00
Penelomax325
Serratella321
TeloganopsisLittle black Quills16
Timpanoga311

3 genera aren't included.
Common Name
Pictures Below

This is page 4 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 269 Mayfly Specimens in the Family Ephemerellidae:

Specimen Page:1...345...28
Ephemerella aurivillii Mayfly NymphEphemerella aurivillii  Mayfly Nymph View 5 PicturesClose examination under a microscope showed definite small 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 the back of this nymph.
Collected February 5, 2004 from unknown in Wisconsin
Added to Troutnut.com by Troutnut on January 25, 2006
Ephemerella needhami (Little Dark Hendrickson) Mayfly DunEphemerella needhami (Little Dark Hendrickson) Mayfly Dun View 7 PicturesSee the comments for an interesting discussion of the identification of this dun.
Collected June 1, 2007 from the West Branch of the Delaware River in New York
Added to Troutnut.com by Troutnut on June 4, 2007
Eurylophella (Chocolate Duns) Mayfly NymphEurylophella (Chocolate Duns) Mayfly Nymph View 5 PicturesThis nymph is an extremely early instar (Instar: Many invertebrates molt through dozens of progressively larger and better-developed stages as they grow. Each of these stages is known as an instar. Hard-bodied nymphs typically molt through more instars than soft-bodied larvae.).
Collected February 7, 2004 from unknown in Wisconsin
Added to Troutnut.com by Troutnut on January 25, 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
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
Female Drunella grandis (Western Green Drake) Mayfly DunFemale Drunella grandis (Western Green Drake) Mayfly Dun View 6 PicturesI collected this specimen while away from all my good photography equipment except the camera and one of my macro lenses, so I made do. The lighting is from lamps in a hotel room, so it was hard to edit for really true colors, but I tried to get as close as possible. The body was 13 mm long, wing 19 mm long.
Collected July 14, 2017 from the American River in Washington
Added to Troutnut.com by Troutnut on July 24, 2017
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
Specimen Page:1...345...28
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