Porcellio expansus, also known as the Giant Spanish Isopod, is one of the largest terrestrial isopods in the hobby. Its massive size, elongated antennae, and armored appearance make it highly sought after by advanced keepers.
Out of Stock
Porcellio expansus, also known as the Giant Spanish Isopod, is one of the largest terrestrial isopods in the hobby. Its massive size, elongated antennae, and armored appearance make it highly sought after by advanced keepers.
Large, armored body with rough exoskeleton; gray to brown coloration. Adults reach up to 2.3 cm (nearly 1 inch). Long antennae distinguish them from many other species.
3–4 years (with proper care)
Detritivore; consumes decaying leaves, rotting wood, vegetables, and supplemental calcium.
Porcellio expansus is a showcase isopod, highly valued for its size and rarity. It is best suited for dedicated hobbyists looking for unique display species.
Advanced – requires specific conditions and patience due to slow breeding.
10 gallons for a stable colony
Neutral substrate preferred
Not applicable (terrestrial species; calcium supplementation required).
68–78°F (20–25°C)
Up to 23 mm (0.9 inches)
Compatible with springtails and other non-aggressive isopods; best in species-only setups due to rarity.
Not suitable with aggressive predators or in poorly ventilated enclosures.
Porcellio expansus
Porcellionidae
Spain
Colony-dwelling; thrives in groups but less surface-active than other isopods.
Leaf litter, rotting wood, vegetables, fish food, and cuttlebone. Protein supplementation improves breeding success.
Slow breeder; females carry eggs in a marsupium. Colonies grow at a gradual pace due to fewer offspring.
Breeding is slow; requires consistent humidity, ventilation, and calcium-rich diet. Colonies may take months to show growth.
Humidity: 60–75%, Temperature: 68–78°F (20–25°C), with good ventilation.
Sensitive to stagnant, overly humid setups; may struggle with molting if calcium is insufficient.
Reclusive and shy compared to other Porcellio; often hides under deep substrate or decor.
More secretive than laevis or ornatus; spends much time hiding but emerges to scavenge at night.
Porcellio expansus is native to Spain and is famous for being one of the largest terrestrial isopods, with adults exceeding 2 cm in length. They prefer well-ventilated enclosures with a gradient of moist and dry areas. Unlike faster-breeding isopods, expansus colonies take time to establish but are extremely rewarding for collectors. Due to their size and unique look, they are a prized species for display terrariums.