Calymene restevensis
Trilobite
Lower Silurian
Revesto Sbsvyte Formation
Kamyanets-Podolskiy Region, Kitajgorod, Ukraine

30mm trilobite on 77mm matrix.

Calymene is a trilobite genus with an unusually long chronologic range from Ordovician to Devonian and has been found on every continent except Africa and Antarctica.