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Photo#907937
denticulata/strigataria vein markings - Phigalia - male

denticulata/strigataria vein markings - Phigalia - Male
Paulding County, Georgia, USA
This is an image I quickly put together to illustrate one of the primary differences between denticulata and strigataria as discussed here, in which I noted that:

"In denticulata, a very distinct dark “tooth” is located on the M1 vein where it comes off of the discal cell. This is seen as the “3rd tooth” from the costa, evenly spaced along the PM line of denticulata. In strigataria, this marking is either absent (giving the appearance of a gap between two pairs of “teeth”) or greatly reduced to only being a diffuse black spot."

Research in conjunction with genetically identified specimens thus far indicates this characteristic is likely diagnostic, but of course any new data could change that at any time.

Update: I have come across a few denticulata specimens since posting this, which exhibit darker or grainy shading in the postmedian area that also have a greatly reduced (appears nearly absent) 'tooth' along vein M1. In these 3 specimens, the 'tooth' in question was almost imperceptible, with only scant dark scaling along vein M1 where the 'tooth' should be. However, so far, no strigataria specimens exhibit the M1 vein 'tooth' at all. So there are some specimens of denticulata which may pose a challenge.

Nice!
Thank you

 
phigalia
very helpful thank you !

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