Pineapple Spiky
Cristarmadillidium muricatumTiny spiky "pineapple" isopod — a distinctive Mediterranean species, unlike the tropical morphs.
Overview
Cristarmadillidium muricatum (Spiky / Crystal Pineapple), a small European isopod covered in spiny tubercles with a washed-out orange-to-pale-yellow colour that really does resemble a mini pineapple. Most sources place it in Mediterranean Spain (limestone caves and limestone-rich soils), so it wants COOLER, drier, better-ventilated conditions than the tropical morphs. It conglobates (rolls). Intermediate–advanced and slow to establish.
Diet
A light-feeding detritivore that grazes leaf litter and decaying hardwood. Offer small amounts of soft veg; don't overfeed.
A small weekly pinch — Repashy, dried shrimp / krill or fish flakes. This species is a light feeder; remove leftovers promptly.
Always available — cuttlebone, eggshell or limestone. Its limestone-rich origin makes calcium important for moults.
Environment
Good / moderate airflow with a genuine dry-to-moist gradient — a damp retreat plus a properly dry side. Never waterlogged.
Cork bark + limestone hides and leaf litter; a smaller bin holds a stable gradient. Room temperature is fine — no supplemental heat needed.
Substrate
A limestone / calcium-rich temperate mix — topsoil or flake soil with crushed limestone or oyster shell, leaf litter and some decaying hardwood. Keep one damp side and one genuinely dry side; avoid a soaked base.
Temperament
Small, slow, and rolls into a ball when disturbed. A display / collector isopod prized for the spiky pineapple look; a light feeder and slower to build than tropical cleanup crews.
Breeding
Slow. Stable conditions, constant calcium and minimal disturbance; small colonies build gradually. Quarantine new stock before adding to established bins.
Growth
Slow — a light-feeding, slow-establishing species. Give it time.
Common mistakes
- ✕Treating it like a tropical Cubaris — it's Mediterranean: cooler, with a real dry side, not a hot wet box.
- ✕Over-feeding — it eats little; excess brings mould and mites.
- ✕No calcium / limestone — a limestone-origin species needs it for moults.
- ✕No genuine dry retreat — a uniformly wet bin stresses them.
Pro tips
- ✓Aim for a dry-to-moist gradient and let them choose; never let the base go soggy.
- ✓Keep limestone / cuttlebone in the bin at all times.
- ✓Room temperature is fine — don't add heat.
How sources agree
Sources DISAGREE on origin and how wet to keep it: most (Xotic Bugs, PostPods, Herpeton, Isopod Paradise) describe a Mediterranean / Spanish limestone species wanting cooler, ventilated, dry-to-moist gradient care, while The Bio Dude's sheet frames it as a humid tropical forest species (72–78°F, 70–85%). The safe reading — followed here — is Mediterranean with a real humidity gradient, constant calcium and moderate temps, letting the animals self-select moisture. Confidence is medium because of that genuine disagreement.
Sources
Keeping Pineapple Spiky?
Soon you'll be able to track this species in VivKeeper — care reminders, your own notes, and colony history. Free for your first 3 months.