This picture is of a Trinucleus ornatus (von Sternberg, 1833) trilobite fossil. It existed during the Silurian period. The fossil was found in Beroun, Tschechien, Czech Republic. Fossil was on display at the Natural History Museum Vienna (Naturhistorisches Museum Wien) on August 2024.
This fossil reminds me of a trilobite found in the Ordovician Period Kope Formation of Kentucky, USA called Cryptolithus tessellatus (Green, 1832).
