
Armadillidium gestroi, commonly known as the Gestroi Isopod, is a beautiful and hardy terrestrial isopod recognized for its dark body, contrasting yellow markings, and ability to roll into a ball when disturbed. It is a popular choice among isopod keepers due to its attractive appearance and relatively manageable care requirements.
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Armadillidium gestroi, commonly known as the Gestroi Isopod, is a beautiful and hardy terrestrial isopod recognized for its dark body, contrasting yellow markings, and ability to roll into a ball when disturbed. It is a popular choice among isopod keepers due to its attractive appearance and relatively manageable care requirements.
Dark gray to black body with distinctive yellow to cream markings and a textured appearance. Adults can reach approximately 18–20 mm in length.
2–3 years
Leaf litter, decaying wood, vegetables, and calcium sources.
Armadillidium gestroi is an attractive and rewarding isopod for both new and experienced keepers, especially for those who enjoy bold patterns and classic pill-bug behavior.
Beginner to Intermediate – hardy when provided with proper moisture, ventilation, food, and calcium.
2–5 gallons
Slightly acidic to neutral substrate preferred
Not applicable (terrestrial; requires calcium supplementation).
68–78°F (20–26°C)
Up to 20 mm
Best kept in species-only enclosures or with compatible cleanup crew such as springtails.
Predatory reptiles, amphibians, insects, or aggressive and highly competitive isopod species.
Armadillidium gestroi
Armadillidiidae
Southern Europe
Colony-living; does well in groups and can establish a healthy colony under suitable conditions.
Provide constant access to dried leaf litter and decaying hardwood, supplemented with vegetables and calcium sources such as cuttlebone.
Moderate breeder under suitable conditions; females carry developing young in a marsupium.
Breeds readily when provided with stable humidity, suitable temperatures, abundant leaf litter, decaying wood, and adequate calcium.
Humidity: 60–80%, Temperature: 68–78°F (20–26°C), with moderate ventilation and a moisture gradient.
Can experience molting problems and dehydration when humidity is too low. Poor ventilation or excessive moisture can also lead to stress and enclosure problems.
Peaceful and generally active; may hide when disturbed.
Peaceful and relatively active, but will hide under bark, leaf litter, and other cover when disturbed. Can roll into a defensive ball when threatened.
Armadillidium gestroi is native to parts of southern Europe and is appreciated for its striking coloration and classic pill-bug behavior. It prefers a humid enclosure with a moisture gradient, plenty of leaf litter, decaying wood, and hiding places. With stable conditions and proper nutrition, colonies can establish successfully.