About Armadillidium depressum Brandt, 1833
Armadillidium depressum Brandt, 1833 can grow to a maximum length of 20 millimetres (0.71 in), while the related species Armadillidium vulgare reaches a maximum length of 18 millimetres. When disturbed, A. depressum is capable of rolling into a ball. Like Armadillidium nasatum, A. depressum can be told apart from A. vulgare by the gap it leaves when rolled into a ball; A. vulgare completely encloses itself when enrolled. A second distinguishing feature is that A. depressum's pleon curves outwards, which gives the body a splayed appearance. Otherwise, A. depressum looks very similar to A. vulgare, with a dark grey to black body color. Most specimens of A. depressum are concentrated in southwest Britain, near the English Channel, but small populations are also found in scattered towns across England. It is a synanthropic species that lives on walls and under stones in towns and old houses. Like other woodlice, A. depressum feeds on dead plant matter. It has a lifespan of 3 years, and can be seen year-round.
