I have not seen those! Look scary! My go to to get rid of unwanted bug (boat paddlers) is to raise my FC to SLAM level overnight and keep it just under for the next day or so. That seems to take care of them. Good luck and let us know how it works for these.
I agree with kimkats, they enjoy under chlorinated water, so keep it elevated for awhile and then never let it go below your minimum. I used to use my skimmer net to capture them against the wall and smoosh them. LOL If you just scoop them out they will jump off the skimmer back into the pool! Hate those things.
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