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Mayfly Genus Ephemerella (Hendricksons, Sulphurs, PMDs)

Taxonomic Navigation -?-
Kingdom Animalia (Animals)
» Phylum Arthropoda (Arthropods)
» Class Insecta (Insects)
» Order Ephemeroptera (Mayflies)
» Family Ephemerellidae (Hendricksons, Sulphurs, PMDs, BWOs)
» Genus Ephemerella (Hendricksons, Sulphurs, PMDs)
Species in EphemerellaNumber of SpecimensNumber of Pictures
Ephemerella aurivillii730
Ephemerella dorotheaSulphur211
Ephemerella excruciansPale Morning Dun15
Ephemerella invariaSulphur46190
Ephemerella needhamiLittle Dark Hendrickson1786
Ephemerella subvariaHendrickson34162

11 species aren't included.
Common Name
Pictures Below

This is page 2 of specimens of Ephemerella. Visit the main Ephemerella page for:

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

119 Mayfly Specimens in the Genus Ephemerella:

Specimen Page:1234...13
Ephemerella invaria (Sulphur) Mayfly SpinnerEphemerella invaria (Sulphur) Mayfly SpinnerView 12 Pictures
Region: Upper Midwest
Collected Jun 3, 2005
Added May 25, 2006
Ephemerella invaria (Sulphur) Mayfly NymphEphemerella invaria (Sulphur) Mayfly NymphView 8 PicturesThis small Ephemerella invaria nymph was at least a month away from emergence.
Region: Catskills
Collected Apr 19, 2006
Added Apr 21, 2006
Ephemerella needhami (Little Dark Hendrickson) Mayfly SpinnerEphemerella needhami (Little Dark Hendrickson) Mayfly SpinnerView 12 Pictures
Region: Upper Midwest
Collected Jun 4, 2005
Added May 25, 2006
Ephemerella needhami (Little Dark Hendrickson) Mayfly DunEphemerella needhami (Little Dark Hendrickson) Mayfly DunView 7 PicturesSee the comments for an interesting discussion of the identification of this dun.
Region: Catskills
Collected Jun 1, 2007
Added Jun 4, 2007
Ephemerella invaria (Sulphur) Mayfly DunEphemerella invaria (Sulphur) Mayfly DunView 6 Pictures
Region: PA Limestone
Collected May 25, 2007
Added Jun 4, 2007
Ephemerella subvaria (Hendrickson) Mayfly NymphEphemerella subvaria (Hendrickson) Mayfly NymphView 4 PicturesI've never seen this strange coloration on any Ephemerella subvaria nymph in a book before, but it's similar to several other specimens I collected on the same outing, including a smaller one that I photographed. They were outnumbered by the "normal" Ephemerella subvaria nymphs in the sample.
Region: Northeast
Collected Mar 29, 2005
Added Apr 7, 2006
Ephemerella excrucians (Pale Morning Dun) Mayfly NymphEphemerella excrucians (Pale Morning Dun) Mayfly NymphView 5 PicturesI spent (Spent: The wing position of many aquatic insects when they fall on the water after mating. The wings of both sides lay flat on the water. The word may be used to describe insects with their wings in that position, as well as the position itself.) a while with a microscope to fairly positively identify this specimen as Ephemerella excrucians.
Region: Upper Midwest
Collected Jun 9, 2005
Added May 26, 2006
Ephemerella dorothea (Sulphur) Mayfly NymphEphemerella dorothea (Sulphur) Mayfly NymphView 6 PicturesI keyed this nymph carefully under a microscope to check that it's Ephemerella dorothea.
Region: Poconos
Collected May 29, 2007
Added Jun 4, 2007
Ephemerella needhami (Little Dark Hendrickson) Mayfly NymphEphemerella needhami (Little Dark Hendrickson) Mayfly NymphView 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.
Region: Upper Midwest
Collected Jun 8, 2005
Added May 26, 2006
Ephemerella invaria (Sulphur) Mayfly DunEphemerella invaria (Sulphur) Mayfly DunView 6 Pictures
Region: Upper Midwest
Collected May 28, 2005
Added May 24, 2006
Specimen Page:1234...13
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