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Ephemerella invaria (Sulphur Dun) Mayfly Nymph Pictures

 I looked at this small Ephemerella nymph very carefully under a microscope. It as 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 1-banded tibiae (
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.


This mayfly was collected from unknown on February 7th, 2004 and added to Troutnut.com on January 25th, 2006.

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Ephemerella invaria (Sulphur Dun) Mayfly Nymph from unknown in Wisconsin
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Ephemerella invaria (Sulphur Dun) Mayfly Nymph from unknown in Wisconsin
Shown Full Size
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Ephemerella invaria (Sulphur Dun) Mayfly Nymph from unknown in Wisconsin
Shown Full Size
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Ephemerella invaria (Sulphur Dun) Mayfly Nymph from unknown in Wisconsin

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