Here is a good and inexpensive pygidium of a Dalmanitina socialis from the Czech Ordovician. | |||
Location: | Ded Hill, Beroun, Barrandian area, Czech Republic | ||
| Size trilobite: | about 11 mm long | ||
| Age: | Middle Ordovician, Llandeilo, Letná Formation (About 464 mill. Years old) | ||