I found this very small creature crawling out of a hole in a concrete wall. For a size reference, there is a small dried, dead piece of grass, and the texture in the background is my skin. I live in the southwest part of Ohio, In the USA. Climate is mostly temperate. Any idea what it is? It appears to have eight legs and appendages with pinchers on the front.

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It is a pseudoscoropion. They are arachnids, harmless to people but quite good at chomping some of our insect pests (i.e. don't worry if you have them in your house, make them welcome!). I'm afraid I don't know enought about them to hazard a more precise ID (there are several thousand species globally) but some general info about the group at the wiki page here