{"product_id":"helleria-brevicornis-giant-cannonball","title":"Helleria brevicornis (Giant Cannonball Isopod)","description":"\u003ch1\u003eHelleria brevicornis (Giant Cannonball Isopod) for Sale UK\u003c\/h1\u003e\n\u003cp\u003eHelleria brevicornis stands out for size, shape, and behaviour rather than bright pattern. This large yellow-brown rolling isopod from Corsica, Sardinia, and the northern Tyrrhenian region has a smooth rounded look and a distinctive ability to tuck into a tight cannonball-like sphere, which gives it a very different feel from flatter, faster surface species.\u003c\/p\u003e\n\u003cp\u003eFor many keepers, the appeal is collector-led: a big, heavy-bodied roller with a more primitive-looking presence, group-living habits, and quieter enclosure behaviour. It is best treated as a specialist setup species that rewards deep organic substrate, heavy leaf litter, calcium access, fresh air, and low disturbance rather than a sparse, frequently checked display tub.\u003c\/p\u003e\n\u003ch2\u003eWhat makes Giant Cannonball different\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual hook:\u003c\/strong\u003e large, smooth, rounded, and earthy rather than brightly coloured.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDefensive behaviour:\u003c\/strong\u003e rolls tightly into a compact ball when disturbed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnclosure style:\u003c\/strong\u003e more at home in deep litter, humus-rich substrate, and covered areas than on open bare floor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKeeper expectation:\u003c\/strong\u003e better for patient observation than constant surface activity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApproach:\u003c\/strong\u003e advanced and collector-led, with stable conditions more important than frequent adjustment.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eBehaviour in captivity\u003c\/h2\u003e\n\u003cp\u003eThis species is often found in and around leaf litter, humus-rich lower layers, bark cover, and sheltered floor areas. It may burrow into the upper substrate and spend long periods under cover, especially while settling. That is usually normal for this type of isopod and should not be judged by open-floor visibility alone.\u003c\/p\u003e\n\u003cp\u003eA settled group may spread between several covered areas rather than sitting fully exposed. If they stay packed into one damp refuge all the time, the rest of the enclosure may be too dry, too bare, or too stale to use comfortably. Low disturbance matters here; repeated checking can make the colony seem less active than it really is.\u003c\/p\u003e\n\u003ch2\u003eBefore you order\u003c\/h2\u003e\n\u003cp\u003ePrepare the enclosure first. Giant Cannonball isopods suit a deeper, organic substrate with enough body to hold moisture without turning muddy, plus a thick layer of \u003ca href=\"\/products\/leaf-litter\"\u003eleaf litter\u003c\/a\u003e across much of the surface. Add bark or cork hides so they have shaded places to rest, feed, and move without crossing exposed ground.\u003c\/p\u003e\n\u003cp\u003eKeep one area reliably damp, but do not run the whole enclosure wet. A patch of \u003ca href=\"\/products\/sphagnum-moss\"\u003esphagnum moss\u003c\/a\u003e can help hold a usable moist refuge, while the rest of the tub stays less wet but still covered with litter and hides. Fresh air is important; this species should not be treated like a sealed tropical wet-tub isopod.\u003c\/p\u003e\n\u003cp\u003eCalcium should also be available from the start. \u003ca href=\"\/products\/limestone\"\u003eLimestone\u003c\/a\u003e works well as a long-term mineral source in a drier accessible area.\u003c\/p\u003e\n\u003ch2\u003eFeeding and enclosure base\u003c\/h2\u003e\n\u003cp\u003eThe main diet should come from the enclosure itself: leaf litter, decomposing organic matter, mature substrate, and sheltered grazing surfaces. Rotting wood can also add long-term feeding value as well as extra cover, so \u003ca href=\"\/products\/rot-wood\"\u003erot wood\u003c\/a\u003e is worth considering as part of the enclosure rather than as an occasional extra.\u003c\/p\u003e\n\u003cp\u003eFresh foods can be offered sparingly, but they should not become the whole feeding strategy. If supplements get all the attention while the litter layer stays thin, the enclosure base is too weak. For a broader overview of what should carry the diet, see \u003ca href=\"\/pages\/what-do-isopods-eat\"\u003ewhat do isopods eat\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eWho is likely to enjoy this species\u003c\/h2\u003e\n\u003cp\u003eThis species makes more sense for keepers who enjoy large rollers, island-locality interest, and subtle behaviour under cover. It is a good fit if you like building deeper naturalistic tubs with litter, humus, bark, and a real damp-to-drier choice.\u003c\/p\u003e\n\u003cp\u003eIt is less suitable if you want frequent open activity, a simple low-maintenance starter species, or an enclosure that is checked and rearranged all the time. Giant Cannonball isopods are usually better approached as a careful long-term project than an instant display colony.\u003c\/p\u003e\n\u003ch2\u003eCommon mistakes to avoid\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eKeeping the whole tub wet:\u003c\/strong\u003e this often removes choice and can leave the enclosure stale.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eToo little depth:\u003c\/strong\u003e shallow setups make it harder for the colony to use litter and lower layers naturally.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eToo little cover:\u003c\/strong\u003e one hide in an exposed tub often leads to compression under that single shelter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverchecking:\u003c\/strong\u003e repeated lifting of hides can slow settling and make behaviour look worse than it is.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRelying on fresh food alone:\u003c\/strong\u003e the enclosure food base should do most of the work.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eCompare before you choose\u003c\/h2\u003e\n\u003cp\u003eIf you want another large isopod with stronger open feeding response and a more obvious surface presence, \u003ca href=\"\/products\/porcellio-laevis-milkback\"\u003ePorcellio laevis \"Milkback\"\u003c\/a\u003e offers a very different giant-isopod experience. If you prefer to read more about balancing airflow, cover, and moisture before committing, the \u003ca href=\"\/pages\/isopod-habitat-setup-guide\"\u003eisopod habitat setup guide\u003c\/a\u003e is the best next step. You can also browse the wider \u003ca href=\"\/collections\/all-isopods\"\u003eall isopods\u003c\/a\u003e range if you are still comparing colony styles.\u003c\/p\u003e","brand":"Isopods.co.uk","offers":[{"title":"5","offer_id":56496065053052,"sku":null,"price":27.5,"currency_code":"GBP","in_stock":false},{"title":"10","offer_id":56496065085820,"sku":null,"price":50.0,"currency_code":"GBP","in_stock":false},{"title":"20","offer_id":56496065118588,"sku":null,"price":95.0,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0936\/2423\/8460\/files\/Isopods-co-uk-Image-Coming-Soon.png?v=1775130623","url":"https:\/\/www.isopods.co.uk\/products\/helleria-brevicornis-giant-cannonball","provider":"Isopods.co.uk","version":"1.0","type":"link"}