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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 EphemerellidaeNumber of SpecimensNumber of Pictures
Attenella528
Caudatella00
Dannella00
DrunellaBlue-Winged Olives860
EphemerellaHendricksons, Sulphurs, PMDs122556
EurylophellaChocolate Duns1564
Serratella16
Timpanoga00

2 genera aren't included.
Common Name
MatchCommon Name
****Hendricksons, Sulphurs, PMDs, BWOs
Pictures Below ↓

This is page 17 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:

Specimen Page:1...15161718
Ephemerella invaria (Sulphur) Mayfly NymphEphemerella invaria (Sulphur) Mayfly NymphView 4 Pictures
Region: Upper Midwest
Collected Jan 31, 2004
Added Jan 25, 2006
Eurylophella (Chocolate Duns) Mayfly NymphEurylophella (Chocolate Duns) Mayfly NymphView 4 PicturesClose examination under a microscope easily showed abdominal tubercles (
View Full Size
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.).
Region: Upper Midwest
Collected Jan 31, 2004
Added Jan 25, 2006
Ephemerellidae (Hendricksons, Sulphurs, PMDs, BWOs) Mayfly NymphEphemerellidae (Hendricksons, Sulphurs, PMDs, BWOs) Mayfly NymphView 2 PicturesClose examination of this specimen under a microscope reveals that it has small rounded tubercles (
View Full Size
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 the tergites (
View Full Size
One tergite of this Isonychia bicolor mayfly spinner is highlighted in red.
One tergite of this Isonychia bicolor mayfly spinner is highlighted in red.
Tergite: The top (dorsal) part of a single segment on an insect's abdomen.) and the tails are uniformly covered with short black hairs. Looking at this specimen a while later, my early observations were probably not relevant because it was such as small early instar (Instar: Many invertebrates molt through dozens of progressively larger and better-developed stages as they grow. Each of these stages is known as an instar. Hard-bodied nymphs typically molt through more instars than soft-bodied larvae.) mayfly that its identifying characteristics were not fully developed.
Region: Upper Midwest
Collected Jan 31, 2004
Added Jan 25, 2006
Eurylophella (Chocolate Duns) Mayfly NymphEurylophella (Chocolate Duns) Mayfly NymphView 3 PicturesLooking at this specimen under a microscope revealed prominent sharp abdominal tubercles (
View Full Size
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.). Also, abdominal segment 9 is distinctly longer than abdominal segment 8, meaning this is definitely a Eurylophella nymph.
Region: Upper Midwest
Collected Feb 7, 2004
Added Jan 25, 2006
Ephemerella invaria (Sulphur) Mayfly NymphEphemerella invaria (Sulphur) Mayfly NymphView 3 Pictures
Region: Upper Midwest
Collected Jan 13, 2004
Added Jan 25, 2006
Ephemerella invaria (Sulphur) Mayfly NymphEphemerella invaria (Sulphur) Mayfly NymphView 2 Pictures
Region: Upper Midwest
Collected Jan 13, 2004
Added Jan 25, 2006
Ephemerella invaria (Sulphur) Mayfly NymphEphemerella invaria (Sulphur) Mayfly NymphView 4 PicturesI looked at this small Ephemerella nymph very carefully under a microscope. It as no abdominal tubercles (
View Full Size
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.) and 1-banded tibiae (
View Full Size
The tibia of this Isonychia bicolor mayfly spinner is highlighted in red.
The tibia of this Isonychia bicolor mayfly spinner is highlighted in red.
Tibia: A middle segments in the leg of an insect, located between the femur and the tarsus.). I think just a very early instar (Instar: Many invertebrates molt through dozens of progressively larger and better-developed stages as they grow. Each of these stages is known as an instar. Hard-bodied nymphs typically molt through more instars than soft-bodied larvae.) invaria nymph.
Region: Upper Midwest
Collected Feb 7, 2004
Added Jan 25, 2006
Ephemerella invaria (Sulphur) Mayfly NymphEphemerella invaria (Sulphur) Mayfly NymphView 4 Pictures
Region: Upper Midwest
Collected Jan 13, 2004
Added Jan 25, 2006
Eurylophella (Chocolate Duns) Mayfly NymphEurylophella (Chocolate Duns) Mayfly NymphView 2 PicturesIt has the segment 4 gill and abdominal segment 9 is longer than segment 8. I couldn't see abdominal tubercles (
View Full Size
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.), but they may not yet be developed in such an early instar (Instar: Many invertebrates molt through dozens of progressively larger and better-developed stages as they grow. Each of these stages is known as an instar. Hard-bodied nymphs typically molt through more instars than soft-bodied larvae.).
Region: Upper Midwest
Collected Mar 10, 2004
Added Jan 19, 2006
Ephemerella invaria (Sulphur) Mayfly NymphEphemerella invaria (Sulphur) Mayfly NymphView 2 Pictures
Region: Upper Midwest
Collected Jan 13, 2004
Added Jan 25, 2006
Specimen Page:1...15161718
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