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Hello all I was relooking at a piece I obtained many years ago. It has a beautifel cephalon of Trinucleus fimbriatus, which was the reason I bought it. I noticed this weird, rond fossil in the same piece. I was not a member here then and I didn't found it online. I forgot about the object until today. Now I want to know what it is. Does anyone here has an idea? I thought It might be one of the early development stages of a trilobite. It looked like a protaspis but is way to big (online they say protaspis are less than 1 mm, while this piece is 4mm) It's from the middle