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Gen. et sp. indet.

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Cephalon, or more specifically - a glabella, my father found today, here in Poland. It is an erratic boulder and so its age is likely Ordovician or Silurian. Can someone tell the trilobite group or even a genus?

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Technically speaking, the presence of a palpebral lobe and occipital band makes this is a cranidium. 

The key feature is the cephalic median tubercle found on numerous taxa belonging to the Asaphidae.

 

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figure from:

 

Klikushin, V., Evdokimov, A., & Pilipyuk, A. 2009
Ordovician Trilobites of the St. Petersburg Region, Russia.
Saint-Petersburg Paleontological Laboratory, Griffon Enterprises Inc., Master Fossil Japan, 541 pp.

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