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There is no open water or swamp directly on the summit.

But thanks dolomite it's not too karstic, and we have an extremely rainy region here, so not too far below there start rivers in all directions, watering the meadows around.

The next little real (little) bog that I know is "Eschelmoos", 1.6 km southwest.

More interesting maybe "Bergener Moos", 4km north, 1000 m lower.
And "Röthelmoos", 5,5 km south, 800 m lower.

In general, this is an area very rich of water and in the plain before the mountains (starting with the mentioned "Bergener Moos" ) there are plenty of swamps and lakes, as well as there are many spots between the mountains, that usually never fall totally dry.

Back to the fly: Can I take it as a safe O. hydroleon or do you have doubts about it, as "looks like" suggests?