This is probably a kind of mimicry, to ward off predators that mistake the harmless animal for a venomous spider.

Insect and isopod enthusiasts usually encounter them being sold as A. klugii Montenegro or variations thereof.

[5] These pale spots are for mimicry of the Mediterranean black widow, which has similar rows.

[6] The range of Armadillidium klugii lies along the coastline of the Adriatic sea, spanning from Croatia to Montenegro.

The majority of A. klugii records are clustered in Dalmatia, in the northern end of its distribution, but 5 specimens have been reported in south Albania and west Greece.