[1][4] Armadilliidum phalacronum was described as a distinct species of Armadillidium in 2008, based on specimens collected as far back as 1987.

Additionally, the species is also thought to belong to the "Armadillidium insulanum complex", a group of closely related, small-sized pill bugs that occur in various Aegean Islands and the nearby Greek and Turkish coasts.

The frontal shield surpasses the anterior edge of the head, has a nearly straight upper margin and obtuse-shaped lateral angles.

Specifically, specimens have been collected only from Mount Falakro and the southern slopes of the western Rhodope Mountains.

[1][3] Armadillidium phalacronum can be found from 400 m up to 1800 m and in a variety of habitats, ranging from maquis shrublands and mixed forests to alpine meadows.