Skeleton / Nebula Isopods (Armadillidium klugii)

The white markings down the back read like a spine, an x-ray, a set of bones laid over a dark body. That anatomical illusion is exactly why it sells under two different names. Meet the Skeleton Isopod, also traded as the Nebula Isopod, both the same animal: Armadillidium klugii. When the white lines up into a clean vertebral column, you get the Skeleton look; when it breaks apart into busier, cosmic-looking swirls, sellers reach for Nebula instead. It is the same species behind the popular Clown isopod, simply selected for a different expression of that bold pattern.

The body runs a deep reddish-brown to maroon, and the white patches sit boldly on top of it, high in contrast and impossible to mistake for anything else in the genus. At around 21mm an adult is big for an Armadillidium, large enough to carry the pattern across a room rather than hide it in the detail. Like its relatives it conglobates, rolling into a tight, neat ball when disturbed, and the skeletal marks stay visible even then. One quirk sets it apart: unusually for an Armadillidium, a stressed animal can release a milky white defensive secretion. You will rarely see it in normal keeping, and it is harmless, but it is worth knowing the trick is there.

What makes it such a satisfying keep is the pairing of a showpiece pattern with steady, forgiving husbandry. This is a Mediterranean isopod, not a tropical one, and getting that single fact right is most of the battle. A. klugii is an Adriatic native, at home along coastal Croatia, Montenegro, Albania and the ground nearby, where summers run dry and warm. Keep it at ordinary room temperature, anywhere from 18 to 26°C, and it will sit comfortably in a British home year round with no extra heat.

Humidity wants to be moderate, roughly 60 to 80 percent, but the shape of the moisture matters more than the number. Set up a clear gradient with a damp end and a truly dry end, and give the enclosure medium to high ventilation so air keeps moving. The most common mistake is treating this species like a tropical one and keeping the whole tub wet: do that and you invite mould, poor breeding and stressed animals, despite how hardy it otherwise is. Build over a rich, woody base such as flake soil, top it with a generous layer of leaf litter and a few pieces of cork bark for cover, and keep the moist zone to one side rather than everywhere. Leave calcium permanently on offer, cuttlebone or crushed shell, since a good supply underpins clean moults and strong breeding. Feeding is easy: the leaf litter and rotten wood do most of the work, topped up with the odd piece of carrot, courgette or squash and a regular pinch of protein like fish flake or dried daphnia. Clear away anything fresh they haven't finished within a day or two.

Give it a couple of months to settle and A. klugii becomes a prolific breeder, which makes it one of the best first steps into the more eye-catching end of the genus. Larger starter groups establish faster and hold more variety, and sub-adults often begin producing young before they reach full size when they are well fed. If a particular look appeals, you can lean into it: the Dubrovnik locale and the bright Yellow Fellow show how far the same species travels, while the wider Armadillidium collection gathers its cousins in one place. A thriving springtail culture alongside them keeps mould in check around the damp end and the protein, and our guide to isopod genetics, colours and morphs is worth a read if the pattern variation pulls you in.

Every colony leaves here captive-bred and packed with care: a ventilated tub bedded on damp sphagnum, cushioned inside a double-walled box, sent out Monday to Thursday on tracked next-day Royal Mail before 1pm. Live arrival is guaranteed, and we always tuck in a 20% overcount for good measure.