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

Taxonomic Navigation -?-
» Family Ephemerellidae (Hendricksons, Sulphurs, PMDs, BWOs)
Genus in EphemerellidaeNumber of SpecimensNumber of Pictures
Attenella00
Caudatella00
Dannella00
DrunellaBlue-Winged Olives00
EphemerellaHendricksons, Sulphurs, PMDs037
EurylophellaChocolate Duns00
Matriella00
Penelomax00
Serratella00
TeloganopsisLittle black Quills00
Timpanoga00

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


Pictures Below ↓

This is page 19 of specimens of Ephemerellidae. Visit the main Ephemerellidae page for:

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

Pictures of 271 Mayfly Specimens in the Family Ephemerellidae:

Specimen Page:1...181920...28
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
Timpanoga hecuba (Great Red Quill) Mayfly NymphTimpanoga hecuba (Great Red Quill) Mayfly Nymph View 6 Pictures
Collected August 31, 2018 from the Bitterroot River in Montana
Added to Troutnut.com by Troutnut on June 13, 2019
Drunella flavilinea (Flav) Mayfly NymphDrunella flavilinea (Flav) Mayfly Nymph View 6 PicturesAlthough the identification is not certain because the nymph is not yet mature, the configuration of 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 this one--particularly the forefemora--seems to best match Drunella flavilinea.
Collected July 2, 2019 from the Gallatin River in Montana
Added to Troutnut.com by Troutnut on July 18, 2019
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
Serratella micheneri (Little Western Dark Hendrickson) Mayfly NymphSerratella micheneri (Little Western Dark Hendrickson) Mayfly Nymph View 6 Pictures
Collected July 28, 2019 from Mystery Creek #199 in Washington
Added to Troutnut.com by Troutnut on July 30, 2019
Ephemerella tibialis (Little Western Dark Hendrickson) Mayfly NymphEphemerella tibialis (Little Western Dark Hendrickson) Mayfly Nymph View 3 Pictures
Collected July 25, 2019 from Mystery Creek #249 in Washington
Added to Troutnut.com by Troutnut on July 26, 2019
Ephemerella excrucians (Pale Morning Dun) Mayfly NymphEphemerella excrucians (Pale Morning Dun) Mayfly Nymph View 10 Pictures
Collected April 9, 2021 from the Yakima River in Washington
Added to Troutnut.com by Troutnut on April 12, 2021
Drunella doddsii (Western Green Drake) Mayfly NymphDrunella doddsii (Western Green Drake) Mayfly Nymph View 4 Pictures
Collected July 2, 2019 from the Gallatin River in Montana
Added to Troutnut.com by Troutnut on July 18, 2019
Ephemerella excrucians (Pale Morning Dun) Mayfly NymphEphemerella excrucians (Pale Morning Dun) Mayfly Nymph View 9 Pictures
Collected April 9, 2021 from the Yakima River in Washington
Added to Troutnut.com by Troutnut on April 12, 2021
Male Attenella delantala (Small Blue-Winged Olive) Mayfly NymphMale Attenella delantala (Small Blue-Winged Olive) Mayfly Nymph View 10 Pictures
Collected July 25, 2019 from Mystery Creek #249 in Washington
Added to Troutnut.com by Troutnut on July 26, 2019
Specimen Page:1...181920...28
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