Acastella sp.
Trilobite
Lower Silurian
Revesto Sbsvyte Formation
Kamyanets-Podolskiy Region, Kitajgorod, Ukraine

11mm trilobite on 55mm matrix.

Arthropod.

Acastella is a trilobite genus that lived during the Silurian Period and survived into the Devonian.  It is known from Europe and New Zealand but is uncommon wherever it occurs.

This one has a nice cephalon. It seems like most of the specimens we’ve seen lost their heads at stressful times.