[1][2] Armadilliidum pieperi was described as a distinct species of Armadillidium in 2008, based on specimens collected as far back as 1980.

The species is also thought to belong to the "Armadillidium fossuligerum complex", a group of 4 species (A. jerenntrupi, A. fossuligerum sensu lato, A. petralonense and A. pieperi) that occur in the southern part of the Balkan Peninsula (mainly Greece and the adjacent areas of North Macedonia and Bulgaria).

[1] Armadillidium petralonense is a medium-sized species, reaching maximum dimensions of about 17 x 6.7 mm.

Like its sister species, A. petralonense, the frontal shield surpasses the anterior edge of the head, has a completely rounded upper margin and lacks lateral angles.

Specifically, until now, specimens have been collected only from the southernmost regions of the two peninsular municipalities of Chalkidiki, namely Kassandra and Sithonia.