LP Microscope! Ep 8: Slugs, Crabs, and Helical Root Structures

Let's Play Microscope! Episode 8
1080 video of a microscope slide:
Creek bank mud and roots.
We see a "paramecium or sumth'n'", a slug-like single-celled organism.
I try to find a spiky crab, but it remains hidden. There's also a small crab nearby which we take a look at.
I assume the helical structures we see later are roots, or extensions of roots, but I honestly have no idea.