| Here is a large and inexpensive "Valongo Trilobite" of the species Neseuretus tristani. The trilobite shows on the left side a disarticulation that provides free view on the left librigena. | |||
Location: | Valongo - Portugal | ||
| Size trilobite: | about 76 mm long, | ||
| Age: | Middle Ordovician , Llandailo (about. 464. Ma) | ||