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looks a bit like some kind of worm but could easily be wrong, do you have any other images to give more of a clue
I posted the only other one I have a couple of weeks ago as:
Ui marine animal Koversada pp2
Its best to put both images with the same observation otherwise we end up with duplicates. You can go to that previous observation and do 'edit' and add this photo. once this is successful you could then delete this observation (or leave it but note it is a duplicate)
Lat/Lng: 45.1314, 13.6142