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Hi,
Sometimes when I try to identify diptera, I compare wings veins to match another species's photo.
my method is to create two layer in photoshop, one on top the other. The top layer is partial opaque so I can match the veins exactly to the other photo.

My question is when can I use this method?
1. Does different diptera sp. could have the same wing pattern?
2. Does the same diptera sp. (let say from different part of the wourld) could have the different wing pattern?