trilo head

[Gen. et sp. indet.]

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?

[piranha]

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.

 

 

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.

[Gen. et sp. indet.]

Thank you very, very much. Now I feel I know more.