» Genus Ephemerella (Hendricksons, Sulphurs, PMDs)
11 species aren't included.
This is page 4 of specimens of Ephemerella. Visit the main Ephemerella page for:
- The behavior and habitat of Ephemerella.
- 37 underwater pictures of Ephemerella.
Pictures of 129 Mayfly Specimens in the Genus Ephemerella:
Ephemerella invaria (Sulphur Dun) Mayfly Nymph
View 4 PicturesI looked at this small Ephemerella nymph very carefully under a microscope. It as no 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.) and 1-banded tibiae (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.
A few (not all) of the abdominal tubercles on this Ephemerella needhami
nymph are circled. They are especially large in this species.