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Hello friends, I need your help to learn a little more, I am not an expert in trilobites, in fact what I own are the Brachiopods, but accommodating my fossils, I found myself very similar and they filled me with doubts, can you could help me distinguish between an interstricted Peronopsis and a Ptychagnostus atavis, both of the Upper Cambrian, of the Wheeler Formation, in House Range, Millard county, Utah. Thank you.