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Pegomya depressiventris
Photo#968350
Copyright © 2014
Matt Goff
Leaf Mines (in Arnica) -
Pegomya depressiventris
Sitka County, Alaska, USA
These remind me of mines I've seen in an unrelated plant species - but wondered if these might be different. Unfortunately they seemed empty when I found them.
Images of this individual:
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Contributed by
Matt Goff
on 31 July, 2014 - 2:21am
Last updated 29 January, 2017 - 9:48am
Moved
Moved from
Unidentified Leaf Mines
.
It would still be nice to see more examples, including shots of the lower leaf surface, but I feel pretty good about this ID.
…
Charley Eiseman
, 29 January, 2017 - 9:48am
Pegomya depressiventris?
If I'm right, there would be one or more elongate, white eggs stuck to the underside of the mine. I don't suppose you got any shots of the lower leaf surface?
What is the other plant on which you've seen similar mines?
…
Charley Eiseman
, 22 August, 2014 - 10:42pm
Unfortunately...
I did not get pictures of the underside. Had there been something in the mines, I would have collected them. I may still be able to go back and take a look (or find others that are closer).
I should probably note that my sense of 'similar' might not be sufficiently refined, but I've noticed leaf mines that seemed vaguely like these in
Heracleum maximum
(Apiaceae),
Atriplex gmelinii
(Chenepodiaceae), and maybe
Polygonum fowleri
(Polygonaceae). That said, I think maybe the mines in those cases tended to be a bit more blotchy in total. I'll search through my pictures and see what I can find.
I'm not sure if you're interested in taking a look at the variety I've found, but if so, would it be easiest for me to post a bunch to bugguide separately, or create a page on my website where they can all be seen together?
Thanks!
…
Matt Goff
, 23 August, 2014 - 12:48am
BugGuide works fine
If you post all the photos directly to Unidentified Leaf Mines at the same time, they will be more or less grouped together. Seeing variations on the same mine type can definitely be helpful. In addition to posting shots of the leaf underside when possible, higher resolution shots that show the frass pattern would help a lot.
Pegomya depressiventris
belongs to a group of anthomyiid flies that all mine in Asteraceae, so if my initial thought was right, there wouldn't be anything similar on those other hosts you mentioned. My second thought is that this reminds me of certain
Calycomyza
(Agromyzidae) mines on Lamiales. There are a number of
Calycomyza
species known from Asteraceae, but none on
Arnica
. All of the agromyzids known from
Arnica
are species of
Phytomyza
.
I am reasonably certain these mines were made by fly larvae, rather than moth, beetle, or sawfly. I've written a key to all known North American leaf mines on Asteraceae, and
Pegomya depressiventris
is the only one on
Arnica
that seems close to this, but I'm not sure if that species would ever make such long projections; I'd expect it to look more like this:
The little frass grains scattered throughout don't seem right either. Yours could easily be something no one has documented before.
I'll be interested in checking out any leaf mine photos you have. I've already written a key to Apiaceae miners; Caryophyllales (including
Atriplex
and
Polygonum
) is the next group I'll be working on when I get back to my manuscript this fall.
…
Charley Eiseman
, 23 August, 2014 - 7:10am
Moved
Moved from
ID Request
.
…
Beatriz Moisset
, 22 August, 2014 - 8:31pm