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Clown Isopod (Armadillidium klugii)
Armadillidium klugii
The clown of the rocks. A very famous European isopod characterized by a bright aposematic coloration (rows of white and yellow spots with red margins) that mimics the Mediterranean black widow. They require a strict moisture gradient and high ventilation.
Class:Malacostraca
Order:Isopoda
Family:Armadillidiidae
Genus:Armadillidium
Species:Armadillidium klugii
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Environment
Terrestrial
Humidity
40 - 60 %
Ambient temperature
23 - 26 °C
Day temperature
23 - 28 °C
Night temperature
18 - 20 °C
Substrate depth
>= 5 cm
UVB
None
Species description
Geographical Origin and Habitat: Native to the rugged, sunny, and rocky coasts of Dalmatia and the southern Balkan Peninsula (Montenegro, Croatia). It inhabits Mediterranean scrublands, limestone dry stone walls, and coastal forest edges, seeking shelter in deep rocky crevices.
Taxonomy and Genetics: A beautifully colored isopod, reaching up to 18 mm in size. The convex body has a slate-grey or charcoal base color. The peripheral borders (pleurites) display bright red bands edged with white. The dorsal surface features parallel, geometric rows of canary-yellow and cream-white spots, creating a "clown" pattern. The exoskeleton is matte and robust.
Behavior and Habits: Active and moderately bold compared to other isopods, often exploring in the open during low-light hours. Their bright pattern is a form of Batesian mimicry, evolving to resemble the venomous Mediterranean black widow spider (*Latrodectus tredecimguttatus*) to deter predators. They are gregarious and reproduce well.
Morphology: Sexual dimorphism is very subtle: males have slightly longer uropods and a more slender body shape, while mature females are broader and can be observed carrying a brood pouch (marsupium) filled with eggs or young underneath.
Care, breeding and tankmates
Terrarium Setup: Require a well-ventilated enclosure (minimum 10 liters). Provide a 5 cm substrate of organic soil mixed with crushed limestone or cuttlebone for calcium. Cover the surface with a thick layer of dry oak leaves and decomposing white wood. Use cork bark and flat stones for shelters.
Lighting and Heating: Prefer warm, Mediterranean-like conditions. Maintain temperatures of 23–26°C. They can tolerate moderate nighttime temperature drops but should be protected from prolonged freezing conditions, which can stall their reproduction and growth.
Humidity and Hydration: Crucial moisture gradient required. Keep 2/3 of the enclosure completely dry and dusty, while maintaining 1/3 of the area moist using damp sphagnum moss. Provide extensive ventilation to prevent stagnant air, which can cause mold or suffocation.
Feeding and Supplementation: Feed primarily on dry leaves and decaying wood. Supplement their diet with slices of raw carrots, sweet potatoes, spirulina flakes, and dried gammarus or shrimp powder to support shell development and enhance color. Remove uneaten fresh food within 24 hours.
Compatibility: Completely peaceful, social, and gregarious. They can be safely kept in large groups. Avoid housing them with large, predatory insects or reptiles that might feed on them, but they work well as clean-up crews in dry bio-active setups.
Health and Common Diseases: The most common cause of death is high humidity or poor ventilation, which leads to deadly fungal infections. Maintain the dry-wet gradient strictly. Ensure constant access to calcium sources to prevent molting issues.
Geographic Origin and Distribution
Native to the rugged, sunny, and rocky coasts of Dalmatia and the southern Balkan Peninsula (Montenegro, Croatia). It inhabits Mediterranean scrublands, limestone dry stone walls, and coastal forest edges, seeking shelter in deep rocky crevices.
Origin
Europe, Mediterranean, and West Asia
Terrestrial invertebrate profile
- Diet
- No verified data available
- Life expectancy
- No verified data available
- Adult size
- 2.1 cm
- Lifestyle/Microhabitat
- No verified data available
- Activity cycle
- No verified data available
- Sociality
- No verified data available
- Reproduction
- No verified data available
- Venom level
- No verified data available
- Handling tolerance
- No verified data available
- Brumation
- No verified data available
- Molting
- No verified data available
The catalog's scalar value is 2.1 cm. The Schmalfuss (2013) — revision of the Armadillidium klugii group source reports a maximum adult measurement of 2.1 cm for this species, recorded as body length. The taxonomic record consulted is Armadillidium klugii. These figures are not interchangeable: the first is the profile's editorial reference, whereas the second is a published maximum under a specific measurement convention; differences among sources can reflect sex, population, life stage and measuring method.
Image gallery
Licensed images linked to the species or, when marked, to the closest representative taxon.
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