Porcellio hoffmannseggii 'Orange' Isopods

The standard Titan is a grey animal, slate-coloured over a pale skirt, a big tank of an isopod. Porcellio hoffmannseggii 'Orange' takes that same giant frame and pours warm colour across it, so every plate glows amber where the usual form stays stone-grey. The build is unchanged and the palette is not, which leaves you with one of the largest isopods in the hobby dressed closer to sunset than to rock.

These are substantial animals. Mature adults reach 3 to 4 cm, occasionally nudging 40 mm, on a heavily built, hard-plated body. The orange is not fixed from birth; juveniles start paler and deepen as they grow, so the richest colour belongs to well-fed adults. Males tend to be broader and carry longer uropods, the paired tail projections, which is the simplest way to tell the sexes apart. This is still Porcellio hoffmannseggii, a species from the rocky, sun-baked Mediterranean of Spain, and that origin shapes almost everything about keeping it.

The Spanish background is the part keepers most often get wrong. Where forest-floor isopods want damp, these want the reverse. Aim for a mostly dry enclosure sitting around 50% humidity or a little under, with strong ventilation and a single moist corner, perhaps a quarter of the floor kept damp with sphagnum while the rest stays dry to the touch. Good airflow stops moisture building and lets them move between wet and dry as they please. Room temperature suits them, roughly 18 to 26°C, which most UK homes hold through the year without extra heat.

Give them depth to dig, at least 5 cm of substrate, with sand mixed through for drainage and a Mediterranean feel, plus crushed limestone or another calcium source worked all the way through. Calcium counts for more here than with tiny species, because a large body means a large moult to rebuild. They favour decaying hardwood over leaf litter, so keep rotting wood in front of them at all times, and add regular protein such as dried shrimp, fish flakes or dried mushroom alongside the occasional carrot or courgette. One thing to expect: they do not conglobate. This is a flat-backed Porcellio that cannot roll into a ball, and its defence is size, speed and a fast dive for cover.

Temperament is the other thing to plan around. Males are territorial and will see off rivals rather than pile together, so a colony spreads out instead of clustering, and extra room with several separate hides keeps the friction down. A roomy, well-ventilated tub of fifteen litres or more beats a small box for a starter group. They are slow and long-lived by hobby standards, breeding steadily rather than in booms, and females carry their young in a brood pouch before guarding them through the first couple of moults. Kept apart from other morphs, the orange breeds true, so a pure colony reliably throws orange offspring. Toward people they are harmless, quick to flee but never inclined to bite.

If you already keep the standard Titan (P. hoffmannseggii), care here is identical and the only real difference is colour, grey stone set against warm orange. Both sit among the prize giants of the Porcellio collection, and holding each one's look is as simple as keeping the morphs in separate tubs.

Common questions

How big do they get? Mature adults reach around 3 to 4 cm, among the largest isopods in the hobby, with males the broader sex.

Do they need it humid like other isopods? No. Keep them mostly dry, near 50% humidity, with high ventilation and one moist corner they can visit when they want it.

Will the orange breed true? Yes, as long as you keep this morph away from grey and other hoffmannseggii forms; a pure colony produces orange young.

Can they roll into a ball? No. Porcellio are flat-bodied and lean on size, speed and cover rather than rolling up.

Arriving as captive-bred stock and carefully double-boxed for live dispatch across the UK, they settle in quickly for anyone ready to keep a big, dry-loving isopod with a warm streak.