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Geometrid Moth - Gueneria similaria

Geometrid Moth - Gueneria similaria
Block Island, Washington County, Rhode Island, USA
June 16, 2016
Size: 26 mm wingspan
Might this be a Cabera erythemaria - it is the right size? ID help much appreciated.

Moved from Ennominae.

Gueneria similaria
This appears to be a male (anal tuft rather than pointed), so given that the antennae are simple, I think it's safe to call this Gueneria similaria.

Some others
These were moved based on my guesswork. It would be great if you could check them for me as I may add a couple to MPG:


Also, I question the ID of this one: 1043214.

No worries if you don't have the time.

My thoughts...
479562 – Looks correct. Appears to be a male and has simple antennae.

749182 – I think this is probably correct. However, since I can’t see the tip of the abdomen or the antennae, I base that on the more pronounced FW basal costal bend and the angled terminal edge of the FW, which is a bit trickier to rely on.

928451 – Similar to above; probably correct using the FW characteristics. It has simple antennae, but I can’t sex that one, so that’s not any help. But it does “look” right.

1193893 – Same situation again. I think it’s probably correct, but since I can’t sex it or see the antennae, I base that off of the same more pronounced FW basal costal bend and the angled terminal edge of the FW.

1400703 – Looks correct. The HW shot is really what sells this one. That seems to be a reliable means to distinguish them. And that image is a good example of how not every specimen of similaria has the more pronounced basal bend and angled terminal edge of the FW.

1043214 – Given what’s available to view here, if it’s a male, it’s definitely G. similaria. Not enough visible to determine that though. The basal costal bend isn’t as pronounced, but that’s not necessarily a mark against similaria. The wing shape is almost right in between the two species’ typical appearances. It honestly could fit either species based on the photo, but it was identified by Curtis Lehman, who is pretty solid and reliable on moth IDs, so unless I find something definitive to overturn the ID, I tend to go with it in such a circumstance. The commentary at least establishes the difficulty distinguishing the two and presents the other possibility, which is helpful for anyone viewing it down the road.

Thanks for the quick response. I've updated the MPG page accordingly. If you see any errors, please let me know.


Gueneria similaria?
Really not sure.

Thanks, Steve
My initial suggestion resulted from browsing the MPG Living Moth photos, which does not include Gueneria similaria. Clearly this one needs more study and/or expert opinions (from your comment it seems you are insufficiently sure to move it to species). For the time being I will move it to Ennominae and hope for additional input. Ann: any comment?

Sorry I had not already done it Nigel. I moved one of them back and left the other two in my in box so I could do it after I studied Steve's comments more carefully.

Thank you for catching these, Steve. I won't be moving any more!


Moved from Geometrid Moths.


Moved from ID Request.

I agree and Massachusetts has them.

Thanks, Ann
I found the initial match by searching for June geometrids in Mass, NY & NJ!

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