| On this piece are a Deanaspis goldfussi together with a negative of a Dalmanitina socialis. | |||
| Location: | Letna, Barrandian area, Czech Republic | ||
| Size trilobite: | Deanaspis is about 17 mm long | ||
| Age: | Middle Ordovician, Llandeilo, Letná Formation (About 464 mill. Years old) | ||