I am wondering what family this micro beetle belongs to. I hope the beetle assumption is correct. Here's a movie of him shot at ~30x.

http://images.mirrosoft.net/dscn0105.mov

This micro beetle? was found on the surface of inch deep stream water as it passed over aquatic moss. I took a tuft of plant material and he came along for the ride. Extremely small, I was not aware of him/her until he dashed into the dissecting scope's field of view. I'm not at all squeamish but I practically jumped out of my chair. This was one of my first samples with a first time dissecting scope. He covered great territory for his size, looking like he would leap off the dish onto my lap.

A family id would be much appreciated.