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