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

 This is a tiny Ephemerellid mayfly about 3mm long, certainly 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.) of whatever species it belongs to. I looked at it under a microscope and determined that it has gills on abdominal segments 3-7, no abdominal 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.
)
, and only minute black hairs on the tails as far as I can tell.


This mayfly was collected from unknown on February 5th, 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
Shown Full Size
AddEmail
Ephemerellidae (Hendricksons, Sulphurs, PMDs, BWOs) Mayfly Nymph from unknown in Wisconsin

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