Cubaris sp. 'Frosty Jupiter' Isopods

Cubaris sp. 'Frosty Jupiter' is the frosted cousin of the familiar Jupiter isopod, the same animal with the pigment dialled down. Set it beside the standard Jupiter and you will know it at once: the pale skirts along the edges, the darker band through the middle, the bright lines picking out each segment. On the Frosty the whole pattern is washed lighter, so the colours read as pale cream, white and light yellow where the standard shows bolder tones. It is a selectively-bred colour morph rather than a separate species, and whether the mutation is true albino, leucistic or hypomelanistic is still argued over in the hobby. None of it changes the animal in front of you, which is quietly lovely.

I will be plain with you, having kept standard Jupiters for a few years before adding these: I still lean towards the contrast on the original. But the Frosty is a fine-looking animal in its own right, and plenty of keepers prefer the gentler, paler look. Adults reach around 15 to 20mm, which puts it among the medium-sized Cubaris, and it sits at the accessible end of the premium genus. If you can keep a standard Jupiter, you can keep this one, because the care is the same.

Frosty traces back to the limestone karst and tropical forest floors of Thailand, and that heritage sets the whole routine. I keep mine warm, somewhere around 21 to 26°C, and, more than any exact figure, steady, since cave-adapted animals dislike swings and draughts. Build a humid gradient rather than a wet box: keep one end damp, let the far end run drier, and run good cross-ventilation between the two. Stagnant, waterlogged substrate is what quietly finishes off Cubaris, so the phrase I come back to is moist, not wet. Mist the damp end to hold it rather than soaking the whole tub.

Give them depth to burrow into, a rich humus substrate built on pesticide-free topsoil with sphagnum worked through for moisture. I mix in flake soil for nutrition and structure, and add crushed limestone or eggshell generously throughout, because this is a limestone-cave lineage that seeks calcium out and will graze on it. Top the surface with a generous layer of magnolia leaf litter, which lasts well, alongside cork bark and some rotting white hardwood for cover and slow food. Beyond the leaf litter, offer the odd piece of vegetable, a little protein now and then, and forest moss or lichen, which this species seems fond of grazing.

Frosty Jupiters are shy and mostly nocturnal, so do not expect a colony out on display all day; this is a lift-the-hide-to-watch species. They have a calm temperament, and like all Cubaris they conglobate, rolling into a tight defensive ball when disturbed. One thing I have noticed in our colony is that the Frosties spend a little more time visible on lichen-covered twigs than the standard, which tend to stay tucked under cork bark. Like the parent it is a slow, steady breeder, so treat it as a long project: set it up well, hold conditions stable, leave it undisturbed, and a settled colony rewards the patience with modest, reliable broods.

Within the premium Cubaris, Frosty sits at the friendlier end, a good companion to cave species like the iconic yellow-headed Rubber Ducky and the bold black-and-white Panda King, all of which share this taste for warmth, humidity and calcium. Whichever you pair it with, I would add a thriving springtail culture to the setup, since springtails handle mould and microbial growth at a scale the isopods cannot manage, especially around protein and in the damp zone.

Every order is captive-bred, boxed double-walled around a ventilated tub of damp sphagnum and posted Monday to Thursday by tracked next-day Royal Mail, with a live-arrival guarantee and a small overcount included as standard.