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The first three pictures are Ectenaspis beckeri. I usually don't like to work on trilobites much because of their fragility and their 3d structures plus I don't know what tools that's available to use with it. How I came to the conclusions - it have continuous solid structures which means (edited Thorax) are missing from this specimen. The tip is missing and maybe parts of the head as well. It have a unusually elongated head and its (edited genal) spine appear to be curved. One theory I have is it is upside down. From Decorah formation. Don't know if its rare or uncommon as bottom half looks similar to others from the same family.