Snow White Isopods (Porcellio laevis)

The Porcellio laevis story keeps adding chapters. It started for most people with the Dairy Cow, the black-and-cream workhorse, then came the Giant Orange, and the Snow White is the same tough species again with the pigment bred right out. What is left is a clean, near-pure white woodlouse that throws real contrast against dark substrate and leaf litter. Plenty of "white" isopods actually read grey or off-cream; a well-kept Snow White holds a clean, snow-like tone, which is exactly where the name comes from.

The appeal is the trade-off it does not ask you to make. You get a striking, almost designer-looking morph on a species that is close to bulletproof, breeds like it is going out of fashion and forgives the kind of husbandry slips that would sink something delicate. They are big for a common isopod, up to around 20 mm, fast, busy and often out in daylight, so they work as a display animal as much as a clean-up crew. For a first step into showy morphs without the demanding care that usually comes attached, this is one of the easiest recommendations I can make.

Like all Porcellio, the Snow White cannot roll into a ball. Faced with trouble it backs into cover or simply outruns it, relying on speed rather than armour, and that restless, surface-active habit is part of what makes the colony fun to watch. It is a hungrier animal than the pill woodlice too, with a real appetite for protein, which shapes how you feed it.

Housing is undemanding. A six to ten litre tub with a clip-lock lid and cross-ventilation on both sides suits a starter group. Keep a moisture gradient rather than a uniformly wet floor: roughly three-quarters of the tub lightly damp, a quarter left drier, with good airflow over the top. These are adaptable across normal room temperatures, about 18 to 26°C, so no heating is needed in most homes. Give them a living base of flake soil, rotted hardwood and organic topsoil at least five centimetres deep; I would avoid a plain coco-coir base, which holds water but offers nothing to eat as it sits there.

Top the substrate with a thick layer of leaf litter, cork bark for cover and a permanent calcium source such as cuttlebone or crushed eggshell, which matters doubly on a white animal because clean moults keep the colour crisp. On food, leaf litter and rotting wood are the always-available base, but the protein is where P. laevis parts company with the pill bugs: offer fish flake, dried shrimp or a dedicated isopod protein a couple of times a week, alongside soft veg like courgette, squash and sweet potato. Underfeed the protein and a fast, crowded colony can start nibbling its own softer, freshly moulted members, so keep it topped up.

Breeding needs almost no encouragement. Give a settled group warmth, food and steady calcium and the females will carry young in the brood pouch and drop live miniatures in quick succession; a starter colony can build into a full population inside a few months. If you want the numbers, this is among the fastest breeders in the hobby, which is a large part of why it stays such good value.

Pair them with a springtail culture to keep mould down around the protein feedings, read up on the wider group in our guide to the different types of Porcellio, or browse the full Porcellio collection to see where the Snow White sits. Every order is captive-bred from established UK colonies, sent in a double-walled box around a ventilated tub of damp sphagnum, posted Monday to Thursday by tracked next-day Royal Mail with a slight overcount and a live-arrival guarantee.