{"product_id":"granulatum-isopods","title":"Armadillidium Granulatum Isopods","description":"\u003cp\u003eThe Yellow Spanish Isopod (\u003cem\u003eArmadillidium granulatum\u003c\/em\u003e) is one of the most visually distinctive and beginner-friendly Armadillidium species in the UK hobby. The combination of dark grey to brownish-black body, bright yellow spotting, and a distinctively granulated (bumpy) exoskeleton creates an instantly recognisable isopod that stands out from any other species we stock. The yellow spotting varies considerably between individuals — some show pale, sparse spots while others display vivid, dense yellow patterning — which gives serious keepers something to selectively breed for if they want to push the morph in particular directions.\u003c\/p\u003e\n\u003cp\u003eNative to the Costa Blanca region of Spain and the wider Iberian Peninsula, granulatum are arid-adapted Mediterranean isopods that handle UK room conditions effortlessly. They're widely considered one of the better Armadillidium species for keepers stepping up from absolute beginner species — striking enough to be genuinely rewarding, hardy enough that you won't need to worry about losing a colony to minor mistakes.\u003c\/p\u003e\n\u003cp\u003eWhat makes granulatum particularly worth keeping is the combination: among the largest Armadillidium species (up to 25 mm), notably hardy, prolific once established, and visually distinctive enough to feel like a real upgrade from common beginner morphs. Available in starter colony groups. Captive-bred stock from established UK colonies.\u003c\/p\u003e\n\u003ch2\u003eQuick Care Summary\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eScientific Name:\u003c\/strong\u003e \u003cem\u003eArmadillidium granulatum\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCommon Names:\u003c\/strong\u003e Yellow Spanish Isopod, Granulated Isopod\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFamily:\u003c\/strong\u003e Armadillidiidae\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Iberian Peninsula — particularly Costa Blanca, Spain; also widely distributed across the Mediterranean\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdult Size:\u003c\/strong\u003e Up to 25 mm — one of the largest Armadillidium species\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLifespan:\u003c\/strong\u003e 1–2 years typical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDifficulty:\u003c\/strong\u003e Easy — beginner-friendly\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature:\u003c\/strong\u003e 21–26°C (UK room temperature works year-round)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHumidity:\u003c\/strong\u003e 50–70% — Mediterranean-adapted, drier than tropical species\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVentilation:\u003c\/strong\u003e Medium — good airflow important\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConglobation:\u003c\/strong\u003e Yes — rolls into a tight ball when disturbed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBehaviour:\u003c\/strong\u003e Active day and night, social, often visible\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBreeding:\u003c\/strong\u003e Moderate to prolific once established\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhat Makes Yellow Spanish Isopods Special\u003c\/h2\u003e\n\u003cp\u003eSeveral factors have made granulatum one of the more popular Armadillidium species in the UK hobby:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe yellow spotting is genuinely striking.\u003c\/strong\u003e Where many isopods rely on subtle colouration, Yellow Spanish display bright yellow spots against a dark grey base — high-contrast patterning that's visible from across the room. The intensity varies between individuals, ranging from pale yellow speckling to bold, almost luminous yellow markings on premium specimens.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe granulated texture is a distinctive feature.\u003c\/strong\u003e The species name \u003cem\u003egranulatum\u003c\/em\u003e means \"granulated\" — referring to the small bumps that cover the carapace and give the body a distinctly textured appearance. Up close, the texture is clearly visible and gives them a more \"ancient\" or \"armoured\" look than smooth-shelled species. This isn't subtle marketing — it's a genuinely diagnostic feature that distinguishes them at a glance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAmong the largest Armadillidium species.\u003c\/strong\u003e At up to 25 mm, granulatum are noticeably larger than common Armadillidium like Zebra Isopods. The size makes them substantial display animals — observable from a distance rather than requiring close inspection. Their size also means each individual processes more waste material than smaller cleanup species.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNotably active for an Armadillidium.\u003c\/strong\u003e Granulatum are confident isopods that actively forage during the day as well as at night. They're not the kind of species that hides constantly — once established, you'll regularly see them out exploring the enclosure. This is a major advantage for display setups where you actually want to see your animals.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMultiple morphs available across the hobby.\u003c\/strong\u003e While this listing offers standard granulatum, the species has produced several attractive morphs through selective breeding — including \"White Pearl\" (pearl-white), \"Lemon\" (brown-grey base), and \"Naranjito\" (orange — a naturally-occurring variant from specific Spanish locales). Standard granulatum makes an excellent starting point if you want to build a granulatum-focused collection across multiple morphs.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eConglobation.\u003c\/strong\u003e Like all Armadillidium, they roll into a tight ball when disturbed — adding character to colony observation.\u003c\/p\u003e\n\u003ch2\u003eHow Yellow Spanish Compare to Other Armadillidium\u003c\/h2\u003e\n\u003cp\u003eIf you're choosing between Armadillidium species, here's how granulatum fit in:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003evs \u003ca href=\"\/products\/zebra-isopods\"\u003eZebra Isopods (A. maculatum)\u003c\/a\u003e:\u003c\/strong\u003e Zebras have crisp black-and-white striping at smaller sizes (~18 mm). Granulatum are larger (~25 mm) with yellow spots on dark bases. Zebras for clean monochrome patterning, granulatum for warmer colour interest and larger display animals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003evs \u003ca href=\"\/products\/a-gestroi\"\u003eGestroi\/Yellow Spotted Isopods (A. gestroi)\u003c\/a\u003e:\u003c\/strong\u003e Gestroi share the dark-body-yellow-spots pattern but with bolder red skirting around segments. Granulatum lack the red and have more subtle yellow spotting. Both are larger Mediterranean Armadillidium with similar care.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003evs \u003ca href=\"\/products\/magic-potion\"\u003eMagic Potion (A. vulgare)\u003c\/a\u003e:\u003c\/strong\u003e Magic Potions are selectively bred for speckled multi-coloured patterning. Granulatum are naturally yellow-spotted without selective breeding. Magic Potions for designer-tier complexity, granulatum for naturalistic Mediterranean character.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eBrowse the full \u003ca href=\"\/collections\/armadillidium-isopods\"\u003eArmadillidium collection\u003c\/a\u003e to compare all species and morphs.\u003c\/p\u003e\n\u003ch2\u003eSetting Up the Enclosure\u003c\/h2\u003e\n\u003cp\u003eGiven granulatum's larger size, start with a slightly bigger enclosure than you'd use for smaller Armadillidium. A shoebox-sized container or 15–20 litre tub suits a starter colony of 10. For breeding colonies, scale up to provide more horizontal floor area.\u003c\/p\u003e\n\u003cp\u003eDrill multiple small ventilation holes on opposite sides of the container for cross-ventilation. Granulatum are Mediterranean-adapted and tolerate slightly drier conditions than tropical species, so you can use moderate ventilation without causing problems. Cover holes with fine mesh to prevent escapes.\u003c\/p\u003e\n\u003cp\u003eBrowse our \u003ca href=\"\/collections\/accessories\"\u003eaccessories collection\u003c\/a\u003e for appropriate enclosures, vents, and other essentials.\u003c\/p\u003e\n\u003ch2\u003eThe Moisture Gradient\u003c\/h2\u003e\n\u003cp\u003eLike all Armadillidium, granulatum need a moisture gradient rather than uniform humidity:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOne-third moist:\u003c\/strong\u003e Sphagnum moss patches and damp leaf litter. Mist this area regularly to maintain moisture.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMiddle zone:\u003c\/strong\u003e Moderately damp substrate with leaf litter cover\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo-thirds drier:\u003c\/strong\u003e Drier substrate where they can choose drier conditions if needed. Place protein foods on this side.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe gradient lets the colony self-regulate. They'll move to the damp side for moulting and rehydration, then back to drier zones for foraging. Granulatum tolerate drier conditions better than many isopods, but they still need access to a moist zone.\u003c\/p\u003e\n\u003ch2\u003eSubstrate\u003c\/h2\u003e\n\u003cp\u003eUse organic topsoil (pesticide-free) as a base, with at least 5 cm depth. Mix in \u003ca href=\"\/products\/flake-soil-1l\"\u003eflake soil\u003c\/a\u003e for added nutrition. The substrate doesn't need to be deep — granulatum aren't heavy burrowers — but enough depth gives them options for moulting and security.\u003c\/p\u003e\n\u003cp\u003eTop with generous leaf litter — \u003ca href=\"\/products\/large-magnolia-leaves-for-isopods\"\u003emagnolia leaves\u003c\/a\u003e for long-lasting cover and \u003ca href=\"\/products\/bamboo-leaf-litter\"\u003ebamboo leaf litter\u003c\/a\u003e for structure. Add cork bark hides spread throughout the enclosure. Granulatum use multiple hides actively.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCalcium throughout substrate.\u003c\/strong\u003e Mix crushed limestone or eggshells throughout the substrate. Granulatum benefit from constant calcium availability for healthy moulting at their larger size. Don't just place calcium on top — distribute it through the substrate where they'll encounter it naturally.\u003c\/p\u003e\n\u003ch2\u003eTemperature\u003c\/h2\u003e\n\u003cp\u003e21–26°C is the comfort range. UK room temperature works year-round in most homes — no supplementary heating typically needed. Their Mediterranean origin means they handle the climate well, including the occasional cooler periods. They can even go semi-dormant if kept cold during winter, recovering when temperatures rise — though stable conditions are preferable.\u003c\/p\u003e\n\u003cp\u003eAvoid temperatures consistently above 28°C or below 18°C for extended periods. Brief variation is fine; sustained extremes cause stress.\u003c\/p\u003e\n\u003ch2\u003eDiet\u003c\/h2\u003e\n\u003cp\u003eGranulatum are detritivores with broad appetites and a preference for protein-rich foods:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary diet (always available):\u003c\/strong\u003e Hardwood leaf litter (oak, magnolia, beech), decaying white-rotted wood, lichens, dried plant matter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVegetables (1–2x weekly):\u003c\/strong\u003e Cucumber, courgette, sweet potato, carrot, butternut squash, pumpkin, mushrooms. Replace within 24–48 hours.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFruit (occasionally):\u003c\/strong\u003e Apple, banana, melon\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtein (essential — 1–2x weekly):\u003c\/strong\u003e Granulatum have notable protein appetites. Options include dried daphnia, silkworm pupae, fish flakes, freeze-dried peas, dried shrimp. Browse our \u003ca href=\"\/collections\/accessories\"\u003eaccessories collection\u003c\/a\u003e for the full range of protein supplements.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCalcium (essential — non-negotiable for moulting):\u003c\/strong\u003e Cuttlebone, limestone, crushed eggshells. Their larger size and granulated exoskeleton both demand consistent calcium supplementation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003ePlant-eating warning:\u003c\/strong\u003e Like most Armadillidium, granulatum may snack on soft live plants and moss in bioactive vivariums. Hardy plants and tough mosses fare better than ferns and softer species.\u003c\/p\u003e\n\u003ch2\u003eBreeding\u003c\/h2\u003e\n\u003cp\u003eGranulatum are moderate to prolific breeders once established. Sub-adults often begin breeding before reaching full adult size — particularly common with Armadillidium species. Females carry developing eggs in a brood pouch (marsupium) on the underside of their body and emerge with live mancae after the eggs hatch.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBreeding observations:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSlightly elevated temperatures (22–25°C) accelerate breeding rates\u003c\/li\u003e\n\u003cli\u003eLarger starter colonies (15+ individuals) breed more reliably than tiny starter groups\u003c\/li\u003e\n\u003cli\u003eEstablished colonies become noticeably prolific once population density passes a threshold\u003c\/li\u003e\n\u003cli\u003eYellow spotting variation in offspring is normal — pattern intensity differs across individuals\u003c\/li\u003e\n\u003cli\u003eSelective breeding can push the morph toward brighter yellow expression over generations\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eA starter colony of 10–20 typically produces visible mancae within 2–3 months under good conditions. Population growth is steady rather than explosive, but sustainable over the long term.\u003c\/p\u003e\n\u003ch2\u003ePair With Springtails\u003c\/h2\u003e\n\u003cp\u003eAdd a thriving \u003ca href=\"\/collections\/springtails-for-sale\"\u003espringtail culture\u003c\/a\u003e to any granulatum setup. Springtails handle mould and microbial growth at a scale isopods can't manage, particularly important around protein foods. They coexist peacefully with granulatum and form an essential cleanup partnership.\u003c\/p\u003e\n\u003ch2\u003eWhy Yellow Spanish Isopods Make a Good Step-Up Choice\u003c\/h2\u003e\n\u003cp\u003eFor keepers ready to move beyond absolute beginner species into something more visually rewarding, granulatum offer one of the best stepping-stone options:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGenuine visual impact.\u003c\/strong\u003e The yellow-spotted, granulated appearance is distinctive enough to feel like a real upgrade from plain beginner morphs without committing to demanding designer species.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSize you can appreciate.\u003c\/strong\u003e At up to 25 mm, granulatum are large enough to genuinely observe and appreciate from across a room. You're getting display-worthy animals, not just functional cleanup crew.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMediterranean-hardy.\u003c\/strong\u003e Despite their visual appeal, granulatum are forgiving of minor husbandry mistakes. Their arid-adapted genetics make them tolerant of the conditions most UK homes naturally provide.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEducational about Mediterranean isopod ecology.\u003c\/strong\u003e Keeping granulatum introduces concepts like moisture gradients, calcium-rich substrates, and Mediterranean adaptation — practical foundations for keeping more demanding species like Klugii varieties later.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMultiple morphs to collect.\u003c\/strong\u003e If you enjoy granulatum, the species has produced several attractive morphs (White Pearl, Lemon, Naranjito) that you might explore over time, all with identical care requirements.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eActive and visible.\u003c\/strong\u003e Unlike shy nocturnal species, granulatum are confident enough to be regularly visible during the day. You'll actually see them rather than wondering if they're still alive.\u003c\/p\u003e\n\u003ch2\u003eRealistic Expectations\u003c\/h2\u003e\n\u003cp\u003eNewly arrived granulatum may show less intense yellow patterning than mature adults. Spot intensity develops with age and good nutrition. Given 2–3 months of stable conditions, juveniles develop into the bold yellow-spotted adults you see in marketing photos.\u003c\/p\u003e\n\u003cp\u003ePattern variation across the colony is normal. Some individuals will have bright, dense yellow spotting; others will be more subtly marked. This isn't a defect — it's the natural variation that gives granulatum their visual character. If you want to push the morph toward brighter expression, selectively breeding the most vivid individuals over generations is a genuine breeding project worth pursuing.\u003c\/p\u003e\n\u003cp\u003eDon't expect rapid colony explosions like \u003cem\u003ePorcellio scaber\u003c\/em\u003e. Granulatum breed steadily but moderately — population growth is reliable but not dramatic.\u003c\/p\u003e\n\u003ch2\u003eBuilding Your Setup\u003c\/h2\u003e\n\u003cp\u003eA complete granulatum setup needs basic substrate components, calcium-rich materials, leaf litter, and protein supplements. Browse our \u003ca href=\"\/collections\/accessories\"\u003eaccessories collection\u003c\/a\u003e for everything you need — enclosures, ventilation, leaf litter, calcium (cuttlebone, limestone), and protein supplements (daphnia, silkworm pupae, fish flakes, freeze-dried peas).\u003c\/p\u003e\n\u003cp\u003eFor more on Armadillidium species and morphs, browse the full \u003ca href=\"\/collections\/armadillidium-isopods\"\u003eArmadillidium collection\u003c\/a\u003e. New keepers should also see our \u003ca href=\"\/blogs\/isopods-useful-articles\/setting-up-selecting-your-first-isopods\"\u003esetting up guide\u003c\/a\u003e for full enclosure walkthroughs covering substrate layering, ventilation, and the moisture gradient approach essential for Mediterranean Armadillidium success.\u003c\/p\u003e","brand":"PostPods","offers":[{"title":"10","offer_id":45172955349286,"sku":"AG10","price":5.0,"currency_code":"GBP","in_stock":true},{"title":"100","offer_id":45172955382054,"sku":"AG100","price":32.5,"currency_code":"GBP","in_stock":false},{"title":"20","offer_id":45172955414822,"sku":"AG20","price":9.0,"currency_code":"GBP","in_stock":true},{"title":"50","offer_id":47527082524966,"sku":"","price":17.8,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0759\/0707\/2294\/files\/armadillidium-granulatum-isopods-7819217.jpg?v=1763810291","url":"https:\/\/postpods.co.uk\/products\/granulatum-isopods","provider":"Isopods For Sale UK | PostPods","version":"1.0","type":"link"}