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Specimen Discussion

> Anyone recognize this Drunella?

The Specimen

The Discussion

Troutnut	June 8th, 2007, 2:52 pm
The Admin Fairbanks, AK Posts: 2021	I'm a bit puzzled about this one. See the specimen description for details. I know female duns are awful for identification, but this is the only one of its species I could find. Would any of you Ephemerellid experts (Konchu!!) care to take a guess?
	Jason Neuswanger The Troutnut
GONZO	June 8th, 2007, 3:58 pm
Site Editor "Bear Swamp," PA Posts: 1636	Could be tuberculata, but distinguishing between that and walkeri is something I'll leave in Konchu's capable hands. However, I don't think that the size difference suggested by Allen and Edmunds is valid.
Troutnut	June 8th, 2007, 4:01 pm
The Admin Fairbanks, AK Posts: 2021	I don't think that the size difference suggested by Allen and Edmunds is valid. You're probably right. That's a pretty outdated paper. It's just the best hint I've got to go on for now.
	Jason Neuswanger The Troutnut
GONZO	June 8th, 2007, 5:07 pm
Site Editor "Bear Swamp," PA Posts: 1636	I just reread Konchu's paper on the Drunella revisions, hoping to find something more definitive. It mostly helped to confirm that distinguishing between tuberculata, walkeri, and allegheniensis is very difficult due to variability. I suppose it's appropriate to rule out allegheniensis based on distribution. I also thought that the early hatch date might rule out walkeri, but apparently there can be wide discrepancies between different groups or cohorts even within the species. (And an evening Drunella emergence is something I've only witnessed on the Delaware.)
Konchu	June 9th, 2007, 6:03 am
Site Editor Indiana Posts: 364	Too early in the morning to put a species name on that specimen. Walkeri/tuberculata are likely candidates. I'd lean towards walkeri, but I'd never put it in writing on a det label.
Troutnut	June 9th, 2007, 8:19 am
The Admin Fairbanks, AK Posts: 2021	What do you guys think of the protrusion below the right eye on the second picture down? That's an interesting feature in a dun.
	Jason Neuswanger The Troutnut
GONZO	June 9th, 2007, 8:27 am
Site Editor "Bear Swamp," PA Posts: 1636	It appears to have lost its righthand antenna, so I took that protrusion to be the healed remains. Perhaps the damage occurred in an earlier larval stage.
Taxon	June 9th, 2007, 9:32 am
Site Editor Mercer Island, WA Posts: 921	Anyone know on which lifestage(s) and anatomic location(s) the tubercle(s) (for which this species in named) appear(s)? Once Jason got me looking closely at the second photo, I couldn't help but wonder about that interesting midline nodule on top of the head, or perhaps the pronotum.
	Roger Rohrbeck www.FlyfishingEntomology.com
GONZO	September 21st, 2009, 2:53 pm
Site Editor "Bear Swamp," PA Posts: 1636	Konchu's mention of D. tuberculata in the Smokies led me back to this old thread and Roger's question about the etymology of the name. Anna Haven Morgan originally described the species from a nymph found in the upper part of Fall Creek near Ithaca, NY. Although she didn't explain the etymology, she did refer to "two large erect tubercles on the occiput" of the head, and she also illustrates these in her paper.

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