Porcellio hoffmannseggii 'White Antenna' Isopods

Most of what draws the eye on an isopod is size or bold colour, but the pull of the White Antenna Titan is one small feature: a pair of bright white antennae waving out ahead of a big grey body. It is a subtle flourish on an already huge animal. This is Porcellio hoffmannseggii 'White Antenna', a selectively kept morph of the Titan, and once you have picked out those pale antennae working across the substrate at dusk, you notice them every time.

The Titan is one of the largest isopods in the hobby, with adults reaching 3 to 4 cm, and the White Antenna morph carries all of that bulk. The body stays the familiar slate grey with a thin white skirting along the edges, so the antennae are the point of difference rather than a wholesale colour change. That keeps the morph distinct from the pale-bodied Yeti and the bold Orange lines, where the shift runs across the whole animal. Like all hoffmannseggii, they come from the rocky, sun-baked parts of Spain, and that origin shapes everything about how you keep them.

This is where new keepers most often go wrong. Coming from an arid Mediterranean habitat, these are dry-climate isopods, and the instinct to keep things damp will work against you. I run the enclosure at around 50% humidity with strong ventilation and a single moist corner, usually damp sphagnum in one quarter of the tub, and leave the rest dry. Airflow matters as much as the moisture level, so cross-ventilation beats a single mesh lid, and if you are ever unsure, err drier and add ventilation.

Give them room and give them cover. A starter colony wants at least 15 litres, more as it grows, because the males are territorial and defend space by chasing rivals off. Scatter cork bark, wood and flat bark pieces so individuals can spread out instead of squabbling over one spot. The substrate can be a drier mix of topsoil and sand with plenty of decaying hardwood, which they prefer over leaf litter, and at least 5 cm of depth for burrowing. Calcium is not optional at this size, so keep cuttlefish bone, crushed limestone or oyster shell available for healthy moults. Warmth of 20 to 26°C suits them, which most UK rooms hold for much of the year.

Feeding is straightforward. Decaying wood and leaf litter stay in permanently, topped up with the odd vegetable such as carrot, courgette or squash once or twice a week and, importantly, regular protein like fish flakes or dried shrimp, which giant Porcellio need more of than most isopods. Breeding is steady rather than explosive. Females carry their young in a brood pouch, release fully formed juveniles, then guard them through the first couple of moults, longer than most of the genus manages. Keep this morph on its own and the white antennae breed true, so a pure colony reliably throws white-antennaed offspring.

If you want the same commanding size without the antennae detail, the standard Titan (P. hoffmannseggii) is the same animal in classic grey, with identical care. It is worth comparing the two, and the rest of the Porcellio collection, before you settle on a giant.

Common questions

Do White Antenna Titans roll into a ball? No. Like all Porcellio they are flat-bodied and cannot conglobate, relying on size, speed and cover instead. If you want a ball-roller, an Armadillidium is the better bet.

Are they a good starter isopod? They are a step up. The dry husbandry and territorial males take some managing, so a hardier species is a gentler place to begin, but a keeper with a little experience will get on well with them.

Can I keep them with other hoffmannseggii morphs? They will live together without trouble, but the antennae trait only breeds true in a pure colony, so keep the morphs apart if you want to hold the look.

Kept dry, well ventilated and well fed, these are long-lived, characterful isopods that reward patience, and every order is double-boxed for a safe UK journey.