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Ephemerella needhami (Little Dark Hendrickson) Mayfly Nymph Pictures

 I took quite a few notes at the microscope when I collected this specimen. They're attached to the appropriate pictures.

I found this specimen in the same collection as a similar one. Since I only have strange views of this one, it's possible that they're actually the same specimen and I somehow confused my picture-ordering and got the impression that they're different nymphs.


This mayfly was collected from the Namekagon River on June 8th, 2005 and added to Troutnut.com on May 26th, 2006.

There are postero-lateral projections on adominal segments 4-9.  Ephemerella needhami (Little Dark Hendrickson) Mayfly Nymph from the Namekagon River in Wisconsin
There are postero-lateral (Lateral: To the side.) projections on adominal segments 4-9.
There are fairly prominent tubercles on abdominal segments 2-8, and none on segments 1, 9, and 10, not even at high magnification.  Ephemerella needhami (Little Dark Hendrickson) Mayfly Nymph from the Namekagon River in Wisconsin
There are fairly prominent 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 abdominal segments 2-8, and none on segments 1, 9, and 10, not even at high magnification.
The maxillary palp is 3-segmented and, in this photo, rather blurry.  Ephemerella needhami (Little Dark Hendrickson) Mayfly Nymph from the Namekagon River in Wisconsin
The maxillary palp (
The palp on the maxilla of an Ephemerella nymph (detached and photographed under a microscope) is highlighted in red here.
The palp on the maxilla of an Ephemerella nymph (detached and photographed under a microscope) is highlighted in red here.
Palp: A long, thin, often segmented appendage which can protrude from certain insect mouth parts such as the maxillae. Also known as the < />palpus.
)
is 3-segmented and, in this photo, rather blurry.
The fore tarsal claw has 7 denticles.  Ephemerella needhami (Little Dark Hendrickson) Mayfly Nymph from the Namekagon River in Wisconsin
The fore tarsal claw (Tarsal claw: The claws at the tip of the tarsus, on an insect's "foot.") has 7 denticles (
The denticles on the tarsal claw of this Ephemerella nymph are highlighted in red.
The denticles on the tarsal claw of this Ephemerella nymph are highlighted in red.
Denticle: Small tooth-like projects, often appearing like serrations on the tarsal claws of certain mayfly nymphs.
)
.

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