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Mayfly Genus Ephemerella (Hendricksons, Sulphurs, PMDs)

Taxonomic Navigation -?-
Species in EphemerellaNumber of SpecimensNumber of Pictures
Ephemerella aurivillii00
Ephemerella dorothea dorotheaPale Evening Dun00
Ephemerella dorothea infrequensPale Morning Dun00
Ephemerella excruciansPale Morning Dun00
Ephemerella invariaSulphur Dun015
Ephemerella needhamiLittle Dark Hendrickson00
Ephemerella subvariaHendrickson024
Ephemerella tibialisLittle Western Dark Hendrickson00

11 species aren't included.
Common Name


Pictures Below

This is page 12 of specimens of Ephemerella. Visit the main Ephemerella page for:

  • The behavior and habitat of Ephemerella.
  • 37 underwater pictures of Ephemerella.

Pictures of 158 Mayfly Specimens in the Genus Ephemerella:

Specimen Page:1...111213...17
Female Ephemerella tibialis (Little Western Dark Hendrickson) Mayfly DunFemale Ephemerella tibialis (Little Western Dark Hendrickson) Mayfly Dun View 6 PicturesI'm fairly confident calling this dun Ephemerella tibialis because it emerged from one of several similar nymphs in my bucket, which I was able to ID with quite a bit of certainty. However, it looks very different from the other duns I currently have listed, which makes me rethink their IDs.
Collected August 3, 2020 from the East Fork Big Lost River in Idaho
Added to Troutnut.com by Troutnut on August 18, 2020
Male Ephemerella aurivillii Mayfly DunMale Ephemerella aurivillii  Mayfly Dun View 9 PicturesThis dun hatched in my aquarium on July 16th from an easily identified nymph collected on July 10th, and it molted into a spinner after I photographed it. The beautiful spinner form is listed as separate specimen. I forgot to photograph the dun with the ruler, but naturally his size is pretty similar to what it was as a spinner.
Collected July 10, 2011 from Nome Creek in Alaska
Added to Troutnut.com by Troutnut on July 16, 2011
Male Ephemerella dorothea infrequens (Pale Morning Dun) Mayfly DunMale Ephemerella dorothea infrequens (Pale Morning Dun) Mayfly Dun View 7 PicturesThis dun was collected in proximity to this spinner.
Collected July 1, 2019 from the Madison River in Montana
Added to Troutnut.com by Troutnut on July 18, 2019
Female Ephemerella aurivillii Mayfly DunFemale Ephemerella aurivillii  Mayfly Dun View 6 PicturesThis female was collected in proximity to a male that looks like the same species.
Collected July 1, 2019 from the Madison River in Montana
Added to Troutnut.com by Troutnut on July 18, 2019
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 Ephemerella aurivillii Mayfly DunFemale Ephemerella aurivillii  Mayfly Dun View 5 PicturesThis dun hatched out in my aquarium from this nymph.
Collected July 10, 2011 from Nome Creek in Alaska
Added to Troutnut.com by Troutnut on July 13, 2011
Specimen Page:1...111213...17
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