The Plain Pill Woodlouse (Armadillo officinalis) is a large, highly armored terrestrial isopod native to the Mediterranean basin (including Spain). Famous for rolling into a perfectly seamless defensive ball, it is highly valued by hobbyists for its impressive size, hardiness, and unique startle-response vocalizations.
Size & Appearance: Adults grow up to 19 mm (about 0.75 inches) in length. They feature a matte blue-grey or dark grey shell with distinctive, broadly lightened white edges on the individual carapace segments.
The "Hissing Isopod": It is one of the very few terrestrial isopods capable of stridulation (rubbing their body parts together to produce sound). When startled, they curl up tightly and can emit an audible squeaking or hissing noise.
Extraordinary Lifespan: While most woodlice live for 1 to 2 years, Armadillo officinalis is known for its incredible longevity, living up to 9 years in optimal conditions.
Medicinal Folklore: The specific epithet "officinalis" was historically given to species utilized in herbology. Up until the \(18^{\text{th}}\) century, their calcium carbonate-rich exoskeletons were sometimes consumed to alleviate heartburn.
Dietary Habits: They are detritivores and feed primarily on decaying leaves, dead wood, and moss. They also require a steady source of supplemental calcium (like crushed eggshells or cuttlefish bone) to maintain their heavy armor.Care in Captivity:
