» Family Ephemerellidae (Hendricksons, Sulphurs, PMDs, BWOs)
3 genera aren't included.
This is page 26 of specimens of Ephemerellidae. Visit the main Ephemerellidae page for:
- The behavior and habitat of Ephemerellidae.
- 37 underwater pictures of Ephemerellidae.
- 1 streamside picture of Ephemerellidae.
Pictures of 269 Mayfly Specimens in the Family Ephemerellidae:
Eurylophella (Chocolate Duns) Mayfly Nymph
View 2 PicturesIt has the segment 4 gill and abdominal segment 9 is longer than segment 8. I couldn't see 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.), 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.).
A few (not all) of the abdominal tubercles on this Ephemerella needhami
nymph are circled. They are especially large in this species.
Female Drunella grandis (Western Green Drake) Mayfly Dun
View 7 PicturesI didn't find a male spinner to associate with this one; I'm tentatively calling it grandis based on size alone. I found it floating down the surface of the Henry's Fork (the only one I saw that day, weeks after the hatch probably peaked) crippled by what appears to be a mass of eggs sticking out of its abdomen.