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The Specimen

Ephemerella needhami (Little Dark Hendrickson) Mayfly DunEphemerella needhami (Little Dark Hendrickson) Mayfly Dun View 7 PicturesSee the comments for an interesting discussion of the identification of this dun.
Collected June 1, 2007 from the West Branch of the Delaware River in New York
Added to by on June 4, 2007

The Discussion

GONZOJuly 19th, 2007, 8:51 am
Site Editor
"Bear Swamp," PA

Posts: 1681

Somehow, I don't think this is Serratella--it seems too large (especially for a male), and the "S" with which I'm familiar have very dark wings. I thought I'd call attention to it in the hope that someone might be able to offer some insight and, perhaps, clear up the mystery.
TaxonJuly 19th, 2007, 9:23 am
Site Editor
Plano, TX

Posts: 1343

It's a Paraloptophlebia male dun, lilely P. mollis. For verification, see the male dun on Hatches II Color Plate VII, and use some magnification on the photo to compare the distinctive hind wing costal cell venation to Jason's photos.
Best regards,
Roger Rohrbeck
KonchuJuly 19th, 2007, 9:28 am
Site Editor

Posts: 505
Those IDs were my guesses. I didn't pay any attention to the size aspect. New guess: maybe a Eurylophella?
TaxonJuly 19th, 2007, 11:37 am
Site Editor
Plano, TX

Posts: 1343
Hi Konchu-

I like your guess a lot better than mine. In retrospect, wish I'd initially characterized it thusly. The presence of some costal angulation in the hind wing in Jason's photos was a bit troubling to me, as Paraleptophlebia are customarily rounded, but ah well.

The Mayflies Of Florida by Berner/Pescador, which your enthusiastic recent reference motivated me to purchase, illustrates both the fore and hind wing venation of a male Eurylophella temporalis (previously Ephemerella temporalis).

The venation (of both fore and hind wings) is really close to Jason's photos, except for an interesting (apparent) absence of (costal) crossveins on the basal 75% of the wing in Jason's photos.
Best regards,
Roger Rohrbeck
TroutnutJuly 19th, 2007, 12:30 pm
Bellevue, WA

Posts: 2732
I'll put it in Eurylophella for now. I'm sure it's some Ephemerellid; the body is too stout and the hind wing too wide to fit the general shape of a Paralep.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist
KonchuJuly 19th, 2007, 1:37 pm
Site Editor

Posts: 505
The forceps also are ephemerellid-like.
DhfunkFebruary 25th, 2008, 4:41 am
Avondale PA

Posts: 2
This is definitely Ephemerella needhami. I have photos of subs I reared from this region that look exactly like the posted photo. All Eurylophella from that region have slate-grey wings as subimagos, and more orangish eyes, with neutral brown body (not this reddish brown). Serratella deficiens has darkened "elbows" in the sub. Other Serratella from the region are somewhat similar to needhami, but smaller, of course.
TroutnutFebruary 25th, 2008, 10:15 am
Bellevue, WA

Posts: 2732
Thanks Dhfunk. That sounds like the most confident ID on this one yet and it's pretty consistent with what's been suggested by others.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist
BeardiusDecember 5th, 2008, 1:44 am
Posts: 19I trust DhFunk's identification and expertise as well.

It is nice to see some really top notch taxonomists contributing to these boards.

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