Porcellio magnificus

One of the largest Porcellio species — a chunky Iberian giant that lives up to its name.

Humidity 55–70%

Temperature 20–25°C

Starter Group 15–25+

Ventilation Good

Difficulty Intermediate

About this species

Porcellio magnificus is one of the largest Porcellio species available in the hobby, with adults reaching 2.5-3 cm or more in length. Native to the Iberian Peninsula, it has a robust, broad body and a presence that makes it a favourite among collectors who prefer larger species. Its common name is well earned.

Like all isopods, P. magnificus is a terrestrial crustacean that breathes through gill-like pleopods — not an insect. As a Porcellio, it cannot conglobate. It requires somewhat more attentive care than P. scaber, particularly regarding ventilation and protein provision, earning it an intermediate difficulty rating.

Enclosure

A tub with at least a 30x20 cm footprint is recommended given the species' size. Good ventilation is important — P. magnificus is adapted to well-drained Mediterranean habitats and does not tolerate stagnant, waterlogged conditions. Cork bark, dried leaves, and cuttlebone are essential furnishings.

Substrate

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

Maintain a clear moisture gradient — one damp end, the rest kept moderately dry. Depth 6–10 cm to allow burrowing. Top with dried oak or beech leaves. Softwood (pine, cedar) is toxic and must never be used.

Feeding

Dried hardwood leaves — staple food
Vegetables: courgette, carrot, sweet potato
Cuttlefish bone — essential for calcium and exoskeleton mineralisation
Protein 1–2 times weekly: dried shrimp, fish flakes, dried insects

Large species have proportionally greater nutritional demands. Keep protein available regularly to prevent aggression or cannibalism in crowded setups. Remove fresh food within 48 hours.

Breeding

P. magnificus breeds at a moderate pace. Females carry eggs in a marsupium and produce reasonably sized broods. Colony growth is steady but not explosive — expect several months to build significant numbers from a starter group of 15–25 individuals. The species' larger size means each animal requires more resources, so avoid overcrowding.