| Here is a "Valongo Trilobite" of the species Ectillaenus giganteus with both cheeks. Ectillaenus giganteus is relative rarely been found with both librigena. | |||
Location: | Valongo - Portugal | ||
| Size trilobite: | about 58 mm long, | ||
| Age: | Middle Ordovician , Llandailo (about. 464. Ma) | ||