Found these two woodlice in the first stage of mating. According to the earthlife factsheet for raising woodlice, the mating process is as follows: “The male climbs onto a receptive female, licks her head and drums on her back with his legs for about five minutes. He then shifts to a diagonal position on the female’s back and passes sperm to her left side genital opening from his right hand stylets. He then changes his position to the opposite diagonal and deposits sperm in her right hand genital opening from his left hand stylet. Sperm transfer takes about 5 minutes for each side. In some species such as Philoscia muscorum and Armadillidium vulgare breeding is synchronised within a colony so that all breed at the same time.”

Crustacea: Isopoda: Oniscidea
Common pill bug (okadangomushi) = Armadillidium vulgare

common pill bugcommon pill bug