Reply To: Ordovician, southwestern Wisconsin,

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Asa Kaplan

Julie @julie-niederkorn, you have opened my eyes! I was assuming the entire fossil to be a pygidium, but now I take your point that it comprises the whole thorax plus the pygidium. And that makes it an excellent match for the thoracopygidium of Thaleops ovata. It also helps explain the outline that appears anterior to the thorax: It’s a cross-section through the cephalon. I note especially the robust right gena. For comparison:

Congrats on your first complete trilobite, Julie 🙂