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Ephemerellidae (Hendricksons, Sulphurs, PMDs, BWOs) Mayfly Nymph Pictures

 Close examination of this specimen under a microscope reveals that it has small rounded tubercles (
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 (
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 when it consists of a single chitinous plate (sclerite), or an individual sclerite if the segment has more than one.
)
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.


This mayfly was collected from unknown on January 31st, 2004 and added to Troutnut.com on January 25th, 2006.

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Ephemerellidae (Hendricksons, Sulphurs, PMDs, BWOs) Mayfly Nymph from unknown in Wisconsin
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Ephemerellidae (Hendricksons, Sulphurs, PMDs, BWOs) Mayfly Nymph from unknown in Wisconsin

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