Mayfly Species Ephemerella subvaria (Hendrickson)
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 subvaria (Hendrickson)
Common Names
| Match | Common Name |
 | Hendrickson |
 | Dark Hendrickson |
| Red Quill Spinner |
| Red Quill |
 | Lady Beaverkill |
 | Borcher Drake |
| Beaverkill |
| Whirling Dun |
This is page 3 of specimens of Ephemerella subvaria. Visit the main Ephemerella subvaria page for:
- The behavior and habitat of Ephemerella subvaria.
- 24 underwater pictures of Ephemerella subvaria.
- 4 streamside pictures of Ephemerella subvaria.
34 Mayfly Specimens in the Species Ephemerella subvaria:
Ephemerella subvaria (Hendrickson) Mayfly Nymph
View 2 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 larger one that I photographed. They were outnumbered by the "normal" Ephemerella subvaria nymphs in the sample.
View 2 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 larger 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 subvaria (Hendrickson) Mayfly Nymph
View 3 Pictures
View 3 PicturesRegion: Upper Midwest
Collected Mar 10, 2004
Added Jan 25, 2006
Ephemerella subvaria (Hendrickson) Mayfly Nymph
View 3 PicturesThis is one of the nymphs I collected doing something very, very strange on March 17th 2004. In the middle of the day, around 2 pm, in the water right around my feet I watched lots of Ephemerella nymphs clumsily swimming up all the way to the surface and then just kind of drifting and wiggling around in the water column. None hatched. They seemed to do it more intensely when the sun was out. It wasn't the time of day for the normal invertebrate drift phenomenon, and as far as I know invertebrate drift doesn't involve this kind of clear effort to swim all the way to the surface. I didn't need a net to catch them, I just reached down into the water and grabbed them with my fingers just below the surface.
The prominent abdominal tubercles (
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.) aren't quite black, though, and the general color is a dark brown, though I saw nymphs with all Hendrickson color stages behaving strangely.
View 3 PicturesThis is one of the nymphs I collected doing something very, very strange on March 17th 2004. In the middle of the day, around 2 pm, in the water right around my feet I watched lots of Ephemerella nymphs clumsily swimming up all the way to the surface and then just kind of drifting and wiggling around in the water column. None hatched. They seemed to do it more intensely when the sun was out. It wasn't the time of day for the normal invertebrate drift phenomenon, and as far as I know invertebrate drift doesn't involve this kind of clear effort to swim all the way to the surface. I didn't need a net to catch them, I just reached down into the water and grabbed them with my fingers just below the surface.The prominent abdominal tubercles (
View Full SizeA few (not all) of the abdominal tubercles on this Ephemerella needhami nymph are circled. They are especially large in this species.
Region: Upper Midwest
Collected Mar 17, 2004
Added Jan 25, 2006
Ephemerella subvaria (Hendrickson) Mayfly Dun
View 3 Pictures
View 3 PicturesRegion: Upper Midwest
Collected May 1, 2004
Added Jan 25, 2006
Ephemerella subvaria (Hendrickson) Mayfly Dun
View 3 Pictures
View 3 PicturesRegion: Upper Midwest
Collected May 1, 2004
Added Jan 25, 2006
Ephemerella subvaria (Hendrickson) Mayfly Dun
View 3 Pictures
View 3 PicturesRegion: Upper Midwest
Collected Apr 14, 2004
Added Jan 25, 2006
Ephemerella subvaria (Hendrickson) Mayfly Spinner
View 3 Pictures
View 3 PicturesRegion: Upper Midwest
Collected May 19, 2004
Added Jan 25, 2006
Ephemerella subvaria (Hendrickson) Mayfly Spinner
View 2 Pictures
View 2 PicturesRegion: Upper Midwest
Collected May 16, 2004
Added Jan 25, 2006
Ephemerella subvaria (Hendrickson) Mayfly Nymph
View 3 PicturesHere are the 4 main color variations I've found that I'm considering to be E. subvaria.
View 3 PicturesHere are the 4 main color variations I've found that I'm considering to be E. subvaria.Region: Upper Midwest
Collected Feb 7, 2004
Added Jan 25, 2006
Ephemerella subvaria (Hendrickson) Mayfly Dun
View 3 Pictures
View 3 PicturesRegion: Upper Midwest
Collected Apr 24, 2004
Added Jan 25, 2006
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