Armadillidium vulgare, also called the Common Pill Bug, is one of the most widespread and recognizable terrestrial isopods. It is known for its ability to roll into a ball (conglobate) when threatened, providing natural defense against predators.
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Armadillidium vulgare, also called the Common Pill Bug, is one of the most widespread and recognizable terrestrial isopods. It is known for its ability to roll into a ball (conglobate) when threatened, providing natural defense against predators.
Oval, segmented body with smooth exoskeleton; gray to dark brown coloration. Adults reach up to 18 mm in size.
2–3 years (in captivity with proper care)
Detritivore; eats decaying leaves, wood, vegetables, and requires calcium supplementation.
Armadillidium vulgare is a classic isopod species, perfect for beginners and educational purposes due to its resilience and rolling defense behavior.
Easy – hardy and great for beginners.
2–5 gallons (for a colony)
Neutral substrate preferred
Not applicable (terrestrial species; calcium supplementation required).
65–77°F (18–25°C)
Up to 18 mm (0.7 inches)
Compatible with springtails and other small non-predatory isopods.
Predatory invertebrates or reptiles that may eat them; unsuitable for overly humid environments.
Armadillidium vulgare
Armadillidiidae
Europe (cosmopolitan worldwide)
Colony-dwelling; thrives in large groups.
Offer leaf litter, vegetables, cuttlebone, and protein supplements in moderation.
Females carry eggs in a marsupium for several weeks. Juveniles hatch as small versions of adults.
Readily breeds in captivity when provided with food, moisture, and hides. Populations can grow quickly.
Humidity: 50–70%, Temperature: 65–77°F (18–25°C), with good ventilation.
Overly damp environments can lead to die-offs; requires calcium for successful molting.
Peaceful, hardy, and adaptable. Can roll into a ball when disturbed.
Peaceful scavenger, often seen roaming or curling into a ball when disturbed.
Armadillidium vulgare is native to Europe but now found across the globe. It is a hardy, adaptable isopod suitable for beginners. Unlike Porcellio species, it can roll into a ball when threatened. It thrives in enclosures with leaf litter, hides, and moderate humidity. It is also used in bioactive terrariums for its scavenging role.