Know your companions
Armadillidium granulatum
Armadillidium granulatum is a rolling species recognized for a finely granulated shell. Natural gray-brown tones and yellowish markings can vary between individuals. The textured surface is part of its appearance, not a reason to handle it or scrub the plates.
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Build the stronghold
A refuge beneath the leaves
Lay about 5–8 cm of suitable organic substrate, then add a generous leaf layer and several stable bark hides. Keep a broader ventilated area alongside a protected moisture corner, with enough cover that the animals can move between them.
Choose clean, pesticide-free materials and substrate without fertilizer or other chemical additives. Do not rely on plain coco fiber as the whole food supply. Secure ventilation openings against escapes, place the enclosure away from direct sun, and prepare it before the animals arrive.
Give them a choice
Two paths through the habitat
Water the refuge selectively instead of spraying the whole enclosure to the same wetness. Check below the surface: the dry side may be dry on top while the damp retreat still holds useful moisture underneath.
Air humidity alone cannot tell you whether the substrate under a hide is suitable. Check the refuge gently, keep cover in place, and adjust watering to ventilation and room conditions. Small juveniles need nearby sheltered moisture too.
Stock the royal pantry
Provisions for a living colony
Supply decaying hardwood leaves and wood as the daily food base. Keep calcium available. Fresh vegetables and prepared food are small extras, with portions reduced when the colony leaves them untouched.
A suitable calcium source, such as cuttlebone, should remain accessible. Fresh and protein foods supplement the habitat's decaying plant material. Remove spoiled leftovers, reduce the next portion when food persists, and keep an eye on leaf cover as the colony grows.
Steady care, patient growth
Take up the colony watch
On arrival
Have the enclosure ready before opening the shipping container. Follow our arrival and acclimation guide, and give the colony a quiet place to settle.
During maintenance
Check moisture, leaf cover, leftovers and airflow. Observe a familiar shelter without overturning every hide. Check that the damp corner remains functional as ventilation and seasonal room dryness change.
Give pale or molting animals space and avoid peeling away old shell. Females carry developing young in a brood pouch; growth varies with age, conditions and the starting group. Do not expect a fixed breeding timetable. Never release captive isopods outdoors.
A role in the living habitat
Every companion has a place
Granulatum suits a keeper who can maintain cover and a moisture gradient in a moderate or dry-leaning enclosure. A hot, completely dry habitat is unsuitable despite the species' dry-leaning reputation. Maintain a backup culture before relying on it as a cleanup crew.
Continue removing excessive waste and checking the needs of every inhabitant. A cleanup crew supports routine care; it does not replace it.
Observe before you adjust
Read the signs along the trail
| What you notice | First checks |
|---|---|
| Refuge drying out | Inspect beneath the moss; restore moisture gradually without flooding. |
| Mold on fresh food | Remove leftovers and review portion size, water and airflow. |
| An overheated enclosure | Check sunlight and nearby heaters; protect the culture from heat. |
| Repeated losses | Record conditions and recent changes. Send clear photos to our keeper team. |
These are habitat checks, not diagnoses. If problems continue, ask Isopod King for help before making several large changes at once.
From the keeper’s camp
Questions along the journey
Does a Mediterranean species need salt or beach sand?
No salt treatment is part of this care plan. Build a terrestrial leaf-and-wood habitat with safe substrate, calcium and a moisture refuge; a regional label does not make seawater or salty materials suitable.
How often should I water?
Use the condition of the damp refuge as your guide. Ventilation, substrate depth and room conditions change how quickly it dries, so check it and water selectively instead of following one fixed schedule.
Where can I continue learning?
Explore moisture gradients, feeding essentials and your first 30 days in the Care Archives.
Find your colony
Begin your Granulatum colony story
Granulatum Isopods
Armadillidium granulatum
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The keeper’s journal
Your colony’s ongoing story
Check that the damp corner remains functional as ventilation and seasonal room dryness change. A few short notes on watering, feeding, molts and enclosure changes help reveal patterns without constant disturbance.
- Keep a usable damp refuge.
- Replenish leaves, suitable wood and calcium.
- Remove spoiled supplements.
- Record changes and ask for help when needed.
Care guide reviewed October 25, 2026. Speak with the Isopod King keeper team →