hay infusion critters

I made a hay infusion recently and would like to know what I’m looking at. I know there are general things like protozoa, rotifers, paramecium, ameaba.

I’m looking for a source that gives me more specific identification. I expect there are species identified in hay infusions. Is there a source with pictures that I can use to identify specific critters?

Well, here’s a site with lots of microvideos of pond life, many of which will be closely related to your hay dwellers (or did you do your infusion with pond water?): Molecular Expressions Digital Video Gallery: Pond Life

Not pond water, just hay and stuff from the compost pile with tap water