yeah I dont know what they are or called i just know i had something similar, they would hop across the surface and when i drained the water they would stay on the sides of the glass.
I cant figure out what they are but what i did to attempt to get rid of them was drain the water and take some paper towel wet it with steaming hot water and then push down pretty hard on the class and just wipe them off it worked pretty good you usually have to stay at it for about one or two weeks and Slowly you should see them disappear.
Good luck