This is a rather common heliozoa, a form of amoeba. The sample came from a petri dish with moss from my yard and watered from my microbe aquarium. Looks like some cross contamination has taken place. 
They move real slow, using their spines to walk with, which are a specialized form of pseudopods. Until I saw this video, I assumed the spines were, well, spines. You know, stiff and sharp, like a porkypine? But if you watch the wrecks happening here
, you can see they do bend without breaking.
Here are some stills. Shot with a 40x Nikon Phase Contrast PH3 objective lens. You can see digestive fluids secreted by the spines and some previous dinners still caught on them.
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