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Thank you Theo! This species is very common in the dunes. Curiously P. handlirschi also seems to be very common, but more inland.
I noticed a behavior in the specimen of the photo that I don't understand very well. I made a video of that (http://www.youtub...bZG15xbHRk). The fly was grasping the sand (at around 45 seconds, for example) and I can’t explain why, can you explain this?