Mayfly Family Ephemerellidae (Hendricksons, Sulphurs, PMDs, BWOs)
Taxonomic Navigation -?-
Kingdom Animalia (Animals)
» Phylum Arthropoda (Arthropods)
» Class Insecta (Insects)
» Order Ephemeroptera (Mayflies)
» Family Ephemerellidae (Hendricksons, Sulphurs, PMDs, BWOs)
| Genus in Ephemerellidae |  |  |
| Attenella | 5 | 28 |
| Caudatella | 0 | 0 |
| Dannella | 0 | 0 |
| DrunellaBlue-Winged Olives | 8 | 60 |
| EphemerellaHendricksons, Sulphurs, PMDs | 122 | 556 |
| EurylophellaChocolate Duns | 15 | 64 |
| Serratella | 1 | 6 |
| Timpanoga | 0 | 0 |
2 genera aren't included.
Common Name
| Match | Common Name |
 | Hendricksons, Sulphurs, PMDs, BWOs |
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.
- 9 streamside pictures of Ephemerellidae.
166 Mayfly Specimens in the Family Ephemerellidae:
Ephemerellidae (Hendricksons, Sulphurs, PMDs, BWOs) Mayfly Spinner
View 6 PicturesI'm not sure of the species of this female spinner, and unfortunately I never found the associated males or duns to aid in identification. The egg-laying flight and fall of fairly large clouds of these females caused good rises of choosy trout for a week or so around early July on a large, cold spring creek in the northwoods. There is a distinctive stripe down the female's back, identical to that on this specimen collected a month later.
View 6 PicturesI'm not sure of the species of this female spinner, and unfortunately I never found the associated males or duns to aid in identification. The egg-laying flight and fall of fairly large clouds of these females caused good rises of choosy trout for a week or so around early July on a large, cold spring creek in the northwoods. There is a distinctive stripe down the female's back, identical to that on this specimen collected a month later.Region: Upper Midwest
Collected Jul 1, 2005
Added Apr 22, 2006
Serratella deficiens (Darth Vader) Mayfly Nymph
View 6 PicturesThis nymph has tiny, barely detectable 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.) on its abdominal segments, and I could not find the maxillary palpi. I have tentatively guessed that it is Serratella deficiens.
View 6 PicturesThis nymph has tiny, barely detectable 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 Jun 9, 2005
Added May 26, 2006
Ephemerella 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.
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.
Region: Catskills
Collected May 6, 2007
Added May 18, 2007
Ephemerella needhami (Little Dark Hendrickson) Mayfly Spinner
View 10 Pictures
View 10 PicturesRegion: Upper Midwest
Collected Jun 4, 2005
Added May 25, 2006
Attenella attenuata (Small Eastern Blue-Winged Olive) Mayfly Dun
View 4 PicturesThis specimen came from the same hatch as a male.
View 4 PicturesThis specimen came from the same hatch as a male.Region: Upper Midwest
Collected Jun 8, 2005
Added May 26, 2006
Ephemerella subvaria (Hendrickson) Mayfly Nymph
View 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.
View 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 needhami (Little Dark Hendrickson) Mayfly Nymph
View 6 PicturesThis specimen was collected together with a lighter one of the same species.
It resembles another specimen from about 1300 miles away in Wisconsin, which I tentatively called Ephemerella needhami. This one has much less 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.). It may be that they're both the same species and I don't have my identifications straight.
View 6 PicturesThis specimen was collected together with a lighter one of the same species.It resembles another specimen from about 1300 miles away in Wisconsin, which I tentatively called Ephemerella needhami. This one has much less prominent abdominal tubercles (
A few (not all) of the abdominal tubercles on this Ephemerella needhami nymph are circled. They are especially large in this species.
Region: Catskills
Collected Apr 19, 2006
Added Apr 21, 2006
Attenella margarita (Little Western Blue-Winged Olive) Mayfly Dun
View 6 PicturesI found this dun unusually late in the year for anything in the Ephemerellidae family in the East. It's also small for that family.
View 6 PicturesI found this dun unusually late in the year for anything in the Ephemerellidae family in the East. It's also small for that family.Region: Catskills
Collected Sep 4, 2006
Added Oct 3, 2006
Ephemerella needhami (Little Dark Hendrickson) Mayfly Nymph
View 8 Pictures
View 8 PicturesRegion: Upper Midwest
Collected May 28, 2005
Added May 24, 2006
Ephemerella needhami (Little Dark Hendrickson) Mayfly Nymph
View 4 PicturesThis specimen was collected together with a darker one of the same species.
View 4 PicturesThis specimen was collected together with a darker one of the same species.Region: Catskills
Collected Apr 19, 2006
Added Apr 21, 2006
New features!
