'Wildtype' Isopods (Armadillidium Nasatum)

Armadillidium nasatum is a large, Britain-based species of woodlouse that has been introduced to North America, along with Armadillidium vulgare also found in other parts of Europe.

Compared to the maximum length of 18 millimetres for Armadillidium vulgare, Armadillidium nasatum can reach lengths of up to 21 millimetres. Though similar in outwards appearance to Armadillidium vulgare in dark grey color, the main distinguishing feature is pale longitudinal stripes spanning from head to rear and rectangular-like protrusion towards the apex of the head. Like Armadillidium depressum, it does not form a complete ball when enrolled. The tail has a rounded tip with incurved sides, as opposed to most genus Armadillidium species which have a flat tail.*

*References: Wikipedia