| Here is a Trilobite negative of Dalmanitina socialis from the Czech Republic as a inexpensive study piece. | |||
| Location: | Beroun, Barrandian area, Czech Republic | ||
| Size trilobite: | about 45 mm long | ||
| Age: | Middle Ordovician, Llandeilo, Letná Formation (About 464 mill. Years old) | ||