Porcellio hoffmannseggi

One of the largest European isopods — an impressive Iberian species reaching 3-4 cm.

Humidity 55–70%

Temperature 20–25°C

Starter Group 15–25+

Ventilation Good

Difficulty Intermediate

About this species

Porcellio hoffmannseggi is a large, robust isopod native to the Iberian Peninsula (Portugal and Spain). Adults can reach 3-4 cm in length, making it one of the biggest European isopod species. Its size and relatively bold behaviour make it an impressive display animal.

Like all isopods, P. hoffmannseggi is a terrestrial crustacean — not an insect — that breathes through gill-like pleopods. As a Porcellio species, it cannot conglobate (roll into a ball). It is hardier than tropical Cubaris species but somewhat more demanding than common P. scaber, placing it firmly in intermediate territory.

Enclosure

Given its size, P. hoffmannseggi benefits from a slightly larger enclosure than smaller species — a tub with a 30x20 cm footprint minimum for a starter colony. Good ventilation is important; this species comes from a Mediterranean climate and does not tolerate stagnant, waterlogged conditions. Provide cork bark, dried leaves, and cuttlebone.

Substrate

60% coco coir
20% organic topsoil
10% sand for drainage
10% crushed hardwood leaf litter

Maintain a clear moisture gradient. P. hoffmannseggi likes moderate humidity — not as dry as A. vulgare, not as wet as Cubaris. Depth 6–10 cm to allow burrowing. Top with dried oak or beech leaves. Never use softwood (pine, cedar) — toxic to isopods.

Feeding

Dried hardwood leaves — staple food source
Vegetables: courgette, sweet potato, carrot
Cuttlefish bone — essential calcium source for exoskeleton mineralisation
Protein once or twice weekly: dried shrimp, fish flakes, or dried insects

Larger species have proportionally greater food requirements. Ensure protein is available regularly to prevent cannibalism in crowded colonies. Remove fresh food within 48 hours.

Breeding

P. hoffmannseggi breeds at a moderate pace — faster than Armadillidium but slower than P. scaber or P. laevis. Brood sizes are decent given the species' size. Females carry eggs in a marsupium. Expect steady colony growth over several months rather than explosive population booms. Starting with 15 or more individuals is recommended.