Porcellio werneri (Greek Shield / Space Pods Isopods) for Sale UK

Porcellio werneri — known in the UK hobby as Greek Shield Isopods or "Space Pods" — is one of the most distinctively-shaped isopods in the entire hobby. Their flat, oval body with a milky-white skirt edge around a dark grey-to-black centre creates an unmistakable silhouette that genuinely resembles a Greek warrior's shield or a tiny flying saucer (hence the "Space Pods" nickname). Combined with their substantial size (up to 20 mm at maturity), they're a serious display species that stands out from the typical Porcellio range.

What makes P. werneri particularly worth keeping is the combination: distinctive shape and patterning paired with the relatively hardy Porcellio genetics that make them more manageable than premium Cubaris or Ardentiella species. They're a solid step-up choice for keepers moving beyond beginner isopods into something more visually distinctive, with care requirements that reward attention to detail without demanding ultra-precision husbandry.

Available in groups of 5, 10, or 20. Captive-bred stock from established UK colonies. Currently on sale at 30% off — exceptional value for one of the more distinctive Porcellio species in the hobby. Mixed sizes included for immediate breeding potential.

Quick Care Summary

• Scientific Name: Porcellio werneri
• Common Names: Greek Shield Isopod, Space Pods, Werner's Woodlouse, Pancake Isopod, Greek Shield Porcellio
• Family: Porcellionidae
• Origin: Greece — river banks, stream shores, Mediterranean rocky habitats
• Adult Size: Up to 20 mm
• Lifespan: Up to 4 years with proper care
• Difficulty: Medium — beyond absolute beginner level
• Temperature: 17–26°C (UK room temperature works year-round)
• Humidity: 50–65% with moisture gradient — Mediterranean-adapted, drier than tropical species
• Ventilation: High — significantly more airflow than tropical species need
• Conglobation: No — Porcellio cannot roll into a ball, they rely on speed and tonic immobility
• Behaviour: Mild temperament with territorial males, primarily nocturnal
• Breeding: Seasonal — typically twice per year rather than continuously

What Makes Greek Shield Isopods Special

Several factors have made Porcellio werneri one of the most distinctive Porcellio species in the UK hobby:

The shape is genuinely unique. Most isopods are roughly tubular or rounded; Greek Shields are flat, oval, and disc-shaped — closer in profile to a pancake or shield than a typical pillbug. Combined with the white skirt around a dark central body, the visual effect is unmistakable. There's nothing else quite like them in the standard isopod range.

The "Space Pods" nickname captures the look. Viewed from above, they really do resemble miniature flying saucers — dark central disc with a pale rim that looks almost otherworldly. It's not subtle marketing; the silhouette is genuinely distinctive enough that the nickname stuck across the UK hobby.

Substantial size with proper presence. At 20 mm, Greek Shields are larger than common Armadillidium and most Porcellio species. The combination of size and distinctive shape makes them genuinely viable display animals — observable from across a room rather than requiring close inspection.

Four-year lifespan. Notably longer than the 1–2 years typical of many isopod species. You'll keep individual animals long enough to genuinely get to know them, which makes the patience required to establish a colony more worthwhile.

Mediterranean adaptation. Unlike tropical isopods that demand high humidity and warmth, Greek Shields are Mediterranean-adapted and tolerate the drier conditions most UK homes naturally provide. They're not as demanding to keep at room temperature as Cubaris or Ardentiella species.

Mild temperament with handlers. They're barely aggressive and tolerate gentle handling once acclimated. Some keepers report them accepting hand-feeding once comfortable — unusual for a Porcellio species that can't conglobate for defence.

How Greek Shields Compare to Other Porcellio Species

If you're choosing between Porcellio species, here's how Greek Shields fit in:

• vs Dairy Cow (P. laevis): Dairy Cows are larger (up to 2 cm), bolder visually with piebald patterning, and breed prolifically year-round. Greek Shields have a more distinctive disc shape with skirted edges, but breed only seasonally. Different visual appeal — patterned vs structurally distinctive.
• vs Giant Orange (P. laevis): Giant Oranges are warm orange with the same hardy P. laevis genetics — fast-breeding, voracious, and bulletproof. Greek Shields are more sophisticated visually but slower to breed. Different value propositions.
• vs Porcellio scaber Mix: Scabers are smaller (12 mm), more typical isopod shape, available in multiple colour morphs. Greek Shields are larger, distinctively shaped, single colour scheme. Choose Scabers for variety, Greek Shields for the unique silhouette.
• vs Porcellio magnificus: Magnificus is a large Spanish Porcellio with bold colouration. Greek Shields are similarly large but with the distinctive disc shape and skirted edges. Both are step-up Porcellio choices for serious keepers.

Browse the full Porcellio collection to compare all species.

Setting Up the Enclosure

For a starter colony of 5–10, a 12-litre container is suitable. For larger or breeding colonies, scale up to 25 litres or more — Greek Shields need genuine space to thrive. Larger enclosures are particularly important because males are territorial and will fight if cramped together. Adequate horizontal floor space (more important than tall enclosures for this surface-active species) reduces male-male aggression and supports better colony dynamics.

High ventilation is critical. This is one of the most important husbandry points. Unlike tropical species that need humidity retention, Greek Shields require substantial airflow to survive. Drill plenty of small holes on opposite sides of the enclosure to create strong cross-ventilation. Their natural Mediterranean habitat is breezy and well-ventilated — stagnant air causes serious problems.

Browse our accessories collection for appropriate enclosures, vents, and other essentials.

The Moisture Gradient

Like all Mediterranean Porcellio species, Greek Shields need a strict moisture gradient rather than uniform humidity:

• One-third moist: Sphagnum moss patches and damp leaf litter. Mist this area only, ideally by pouring small amounts of water along one side rather than misting the whole enclosure.
• Two-thirds drier: Genuinely drier substrate. Not "less wet" — actually drier. Plenty of leaf litter and cork bark hides on this side.

The gradient lets the colony self-regulate — they'll move to moist areas for moulting and rehydration, then back to drier zones for foraging. Their natural habitat is by river banks and stream shores, which gives you the model: moisture nearby but the bulk of habitat genuinely dry.

Maintain humidity at 50–65% overall. Higher humidity (typical tropical isopod conditions) causes mould and colony stress in this species.

Substrate

Build a substrate that supports the moisture gradient and provides nutrition:

• Base layer (5+ cm): Coconut coir mixed with sphagnum peat moss as a moisture-retentive base, blended with organic topsoil. Add flake soil for nutrition and structural complexity.
• Calcium throughout: Mix crushed limestone, eggshells, or oyster shell throughout the substrate — Greek Shields are calcium-hungry and benefit from constant access.
• Top layer: Generous hardwood leaf litter — magnolia leaves for long-lasting cover and bamboo leaf litter for structure.
• Hides and structures: Cork bark pieces spread throughout (essential — particularly for territorial males needing separated zones), lotus seed pods, and egg crate sections for vertical hiding opportunities.

The substrate should hold moisture in the wet zone but not be waterlogged anywhere. If you squeeze a handful and water drips out, it's too wet.

Temperature

17–26°C is the comfort range, which is typical UK room temperature year-round. Most homes provide acceptable conditions without supplementary heating. The lower end of the range (17–20°C) actually suits them well during winter, mimicking their natural Mediterranean seasonal cooling.

Slightly warmer conditions (22–25°C) accelerate activity and may trigger breeding behaviour, but their seasonal breeding pattern means high temperatures alone won't produce continuous reproduction the way they do for tropical species.

Diet

Greek Shields are detritivores with notably protein-hungry tendencies typical of Porcellio:

• Primary diet (always available): Dried hardwood leaf litter (they prefer dried over fresh), decaying wood, dried plant matter, lichens
• Vegetables (1–2x weekly): Fruits, vegetables, greens. Replace within 24–48 hours to prevent mould in dry conditions.
• Protein (essential — 2x weekly): Greek Shields are markedly protein-loving. Options include fish flakes, dried minnows, dried shrimp, dried daphnia, freeze-dried peas. Place protein on the dry side of the enclosure. Browse our accessories collection for the full range of protein supplements.
• Calcium (essential — heavy calcium requirements): Cuttlefish bones, limestone, oyster shells, crushed eggshells. Greek Shields need notably more calcium than typical isopod species — keep multiple sources available at all times.
• Reptile/invertebrate moults: Surprisingly, they readily consume sheds from reptiles and other invertebrates — useful waste recycling if you keep other animals.

Protein and calcium aren't optional for this species. Without consistent access to both, Greek Shields suffer moulting issues, weak shell development, and reduced breeding success. Their heavy calcified body structure demands the calcium; their Porcellio metabolism demands the protein.

Seasonal Breeding

This is the most important biological fact about Greek Shields and the main thing that distinguishes them from year-round breeders. Porcellio werneri is a seasonal breeder — typically reproducing only twice per year rather than continuously like most hobby isopods.

What this means for keepers:

• Don't expect continuous baby production like Dairy Cows or Powder Oranges
• Breeding windows are typically aligned with seasonal cues (temperature, daylight)
• Juveniles appear in concentrated batches rather than continuously
• The larval/juvenile stage lasts several months, requiring sustained nutrition
• Population growth is slower than continuously-breeding species
• This is normal behaviour, not a sign of husbandry problems

For best breeding success, maintain stable conditions year-round and let natural seasonal variation occur in your enclosure (slightly cooler/drier winter, slightly warmer/wetter spring-summer mimics their natural cycle). Don't constantly adjust conditions trying to force breeding — let the species' natural rhythm proceed.

Pair With Springtails

Add a thriving springtail culture to any Greek Shield setup. Even though Mediterranean conditions are drier than tropical setups, mould can still develop around protein foods on the moist side of the enclosure. Springtails handle this microbial cleanup before it becomes a problem and coexist peacefully with Greek Shields.

Who Should Buy Greek Shield Isopods?

Ideal for:

• Keepers stepping up from basic Porcellio species (Scaber, Dairy Cow) into more distinctive Mediterranean species
• Collectors building Porcellio collections wanting genuinely unique shapes
• Display setup enthusiasts wanting larger, more substantial isopods
• Anyone who appreciates Mediterranean-adapted species (drier, breezier setups)
• Long-term keepers — the 4-year lifespan rewards patient husbandry
• Patient keepers willing to accept seasonal rather than continuous breeding

Not ideal for:

• Complete beginners — start with hardier species first
• Anyone wanting fast continuous breeding (they're seasonal)
• Tropical-only setups where humidity stays high year-round
• Cramped enclosures (territorial males need space)
• Reptile/amphibian feeder use — too valuable and slow-breeding to justify

Realistic Expectations

Greek Shields breed seasonally, not continuously. If you've kept fast-breeding isopods like Dairy Cows or Powder Oranges, you'll find Greek Shield population growth feels frustratingly slow at first. This is normal for the species and not a sign of poor husbandry. Patience is essential.

The juvenile stage is long — several months in the larval form before reaching adult appearance. Ensure consistent food availability during this entire stage, particularly protein and calcium. Young Greek Shields are more demanding than adults.

Males can fight if cramped. If you notice damaged antennae, missing legs, or stressed animals in your colony, increase enclosure size or reduce male population density. This is a real concern with this species, not a generic isopod warning.

Newly arrived specimens may take a week or two to settle and begin exhibiting their full distinctive shape — they sometimes appear slightly "tucked" during transit recovery. Give them stable conditions and patience, and they'll relax into their proper flat-disc shape within 1–2 weeks.

Building Your Setup

A complete Greek Shield setup needs proper substrate components, calcium-rich materials, leaf litter, and protein supplements suitable for Mediterranean-adapted species. Browse our accessories collection for everything you need — enclosures, ventilation, leaf litter, calcium (cuttlebone, limestone), and protein supplements (daphnia, fish flakes, freeze-dried peas).

For more on Porcellio species and morphs, read our blog post on different types of Porcellio isopods. Browse the full Porcellio collection for related species, or explore all isopods for the complete catalogue.