Chocolate Titan IsopodPorcellio hoffmannseggii
A giant Spanish "Titan" isopod in rich cocoa-brown tones, prized for its enormous size and bold personality.
Overview
Porcellio hoffmannseggii, nicknamed the "Titan Isopod," is among the largest terrestrial isopods kept in the hobby, with mature individuals approaching 40 mm. The Chocolate morph is a selectively bred color line that shifts the species' usual grey tone into deep cocoa-brown shades, typically paired with a contrasting pale skirt. Native to the limestone regions of southern Spain, Morocco, and the Balearic Islands, Titans favor a drier, well-ventilated setup with only a small moist retreat — the opposite of what most tropical isopods want.
Habitat & Setup
Substrate mix: For best results, use Isopod Paradise Organic Substrate specifically formulated to support healthy colonies. If you would rather mix your own, we recommend a blend of 70% organic topsoil, 10% flake soil, 10% milled sphagnum moss, 8% organics(mushroom compost, earthworm castings and leaf litter) and 2% calcium
Hides & decor: Cork bark, decaying hardwood (white-rotted wood is a favorite), limestone rubble
Moisture: Steep, dry-leaning gradient. Keep roughly one-fifth of the enclosure damp (sphagnum moss works well) and the rest dry. Strong cross-ventilation is essential to prevent mold and stress.
Diet & Feeding
Despite their huge size, Titans are surprisingly light eaters. Unlike many isopods that live on leaf litter, they show a clear preference for decaying hardwood — especially white-rotted wood pieces.
✓ Feed These
- White-rotted hardwood pieces
- Oak & magnolia leaf litter
- Fish flakes or dried shrimp (1×/week)
- Powder formulas like Isopod Chow, Repashy Morning Wood, Bug Burger, etc.
- Squash or sweet potato in small amounts
Feeding frequency: Feed lightly, 1–2 times per week. Remove uneaten soft food promptly — in a drier enclosure it can attract pests rather than mold.
Breeding & Lifecycle
Titans mature quickly for a giant species, reaching breeding age in as little as seven months. Females have been documented guarding their young after release — unusual behavior for a isopod.
Mancae care: Juveniles emerge dark brown and lighten toward the mature chocolate shade as they grow. Offer fine powdered foods on the surface for the first few weeks.
Colony tips: Keep an even male-to-female ratio — surplus males become territorial and will fight, stressing the whole colony. Stable temperatures, constant calcium, and minimal disturbance support consistent breeding.
Titan isopods don't roll into a ball like their Armadillidium cousins — when startled, they flatten against bark or duck under leaf litter instead. Their antennae can be as long as their entire body.