Sergey Krasovskiy 
Kujdanowiaspis podolica,  Ukrainaspis kozlowskii, Podolaspis lerichei  
Devonian by ~atrox1

Sergey Krasovskiy 

Kujdanowiaspis podolica,  Ukrainaspis kozlowskii, Podolaspis lerichei  

Devonian by ~atrox1