Armadillidium werneri 'Carrying Leucistic Gene' Isopods for Sale

Armadillidium werneri 'Carrying Leucistic Gene' is a properly sophisticated breeder-focused listing — these aren't visually distinct isopods, they're genetically valuable het carriers of a recessive leucistic allele. Phenotypically they look like normal A. werneri — orange-bodied with the species's characteristic five rows of white spotting — but each individual carries one copy of the leucistic gene, meaning that breeding two carriers together will produce leucistic (white-bodied, black-eyed) offspring at the standard 1-in-4 Mendelian ratio.

This is a listing for keepers who understand colour-morph genetics and want to develop a leucistic A. werneri line of their own. The buyer is paying for the breeding project — not for the visual appearance of the animals themselves. For visual collectors wanting striking-looking isopods today, this isn't the right listing; for breeders wanting to invest in a recessive-line project, it's a properly meaningful one.

One critical disambiguation up front: Armadillidium werneri is not the same as Porcellio werneri 'Silverback' despite the shared species name. They're entirely different genera — Armadillidium werneri Strouhal, 1927 (this listing) is a Greek/Turkish island pillbug-style species that conglobates; Porcellio werneri is the famous flat-bodied "Greek Shield Isopod" Silverback that doesn't roll. Both species honour the same researcher (Franz Werner), but they're independent animals with completely different appearance and care. Like all Armadillidium, the werneri here conglobates — rolling into a perfect defensive ball.

Quick Care Summary

Please note: the care figures below use the well-established consensus for Armadillidium werneri. Verify against the specific care icons on this product page before finalising your setup.

• Scientific Name: Armadillidium werneri Strouhal, 1927
• Common Names: Greater Clown Isopod, Werneri, "Het Leucistic Werneri"
• Genetic Status: Heterozygous carriers of recessive leucistic allele (phenotypically wild-type)
• Family: Armadillidiidae
• Origin: Greece and select Turkish islands
• Adult Size: Up to approximately 20–22 mm — a "flagship" giant Armadillidium
• Lifespan: 3+ years (long-lived; slow maturation)
• Difficulty: Intermediate — easy core care but slow-developing and requires patience
• Temperature: 18–26°C (UK room temperature suits them year-round)
• Humidity: 50–60% with a moisture gradient (drier-leaning Armadillidium care)
• Ventilation: Medium — good airflow important
• Conglobation: Yes — rolls into a perfect defensive ball
• Appearance: Wild-type — orange body with five rows of white spotting (distinguishes from A. klugii, which has only three rows)
• Behaviour: Active, bold, often visible during the day in good setups; sociable group animals
• Breeding: Slow but reliable; ~6 month development cycle per generation
• Rarity: Uncommon — het carrier lines are particularly scarce

What "Carrying Leucistic Gene" Actually Means

This is the central thing to understand about the listing.

Leucism is a recessive trait — to express the leucistic phenotype (white-cream body, distinctively retained black eyes — unlike true albinism), an individual needs two copies of the leucistic allele. Animals with only one copy (the "het carriers" in this listing) look phenotypically identical to wild-type — they carry the genetic information but don't express it visually.

When you breed two het carriers together, the resulting offspring follow standard Mendelian 1-2-1 ratios:

• 25% leucistic offspring — both alleles for leucism; visually express the white-cream body with black eyes
• 50% het carriers — one leucistic allele and one wild-type allele; look phenotypically wild-type, but carry the gene like their parents
• 25% wild-type non-carriers — no leucistic allele at all; visually indistinguishable from het carriers without test breeding

So a small starter group of het carriers gives you the foundation for developing your own leucistic A. werneri line. With patience and proper colony management, you can build toward a stable leucistic colony over several generations. This is a long-term project — particularly with A. werneri's 6-month generation cycle and 2-3 year time to full maturity — but the reward is a genuinely distinctive morph at the end.

For a fuller introduction to isopod colour-morph genetics, see our Isopod Genetics blog — it covers leucism vs albinism, dominance patterns, and selective-breeding strategy in detail.

Leucism vs Albinism — The Important Distinction

Leucism and albinism are sometimes conflated but they're genetically and functionally different:

• Albinism: Lack of all melanin including in the eyes. True albinos have red or pink eyes. Often associated with reduced viability and reduced reproductive vigour.
• Leucism: Reduced or absent pigmentation in the body but eyes retain normal black pigmentation. Generally healthier and more reproductively vigorous than true albinos. The "white but with normal eyes" look.

A leucistic A. werneri colony will look properly distinctive — white-cream body, the classic Armadillidium pillbug shape, and dark eyes for contrast. That eye colour is the giveaway: any true albino-style colour morph would have unpigmented eyes.

About Armadillidium werneri

Armadillidium werneri is one of the larger and more attractive Mediterranean Armadillidium — a "flagship giant" in the genus, reaching 20–22mm with bold orange colouration and five rows of distinct white spots running down the body. Native to Greece and select Turkish islands, it's often compared to the more common A. klugii (Yellow Fellow / Clown Isopod) but is distinguishable by being notably larger, having five rows of spots instead of three, and being notably bolder and more active. They're confident, sociable group animals — often visible during the day in well-structured setups, which is unusual for shy Armadillidium species.

One thing to set expectations: A. werneri is slow. They take up to three years to reach full adult size, and the 6-month generation cycle means breeding projects develop on a measured timescale. The reward is long-lived stable cultures, but patience is required.

How A. werneri Compares to Other Mediterranean Armadillidium

• vs A. klugii 'Yellow Fellow': The natural comparison. Both are Mediterranean spotted Armadillidium and are often confused. A. werneri is larger (20-22mm vs 18-21mm), has 5 rows of spots vs A. klugii's 3, and is bolder and more day-active. The Yellow Fellow is more readily available; werneri is the rarer flagship species.
• vs Porcellio werneri 'Silverback': Critical disambiguation. Despite the shared "werneri" species name, this is a completely different animal. P. werneri Silverback is a flat-bodied Porcellio (Greek Shield Isopod) that DOES NOT roll. A. werneri (this listing) is a round-bodied pillbug-style Armadillidium that DOES roll. Different genera, different bodies, different behaviour.
• vs A. vulgare 'T+ Albino' / A. vulgare 'T- Albino': Both are Armadillidium colour-genetics morphs. The A. vulgare albinos are already-expressing visual morphs (the T+ shows reduced melanin with retained tyrosinase; the T- is classical full albino). The "Carrying Leucistic Gene" werneri is the breeding-project precursor stage — het carriers of a recessive leucistic gene, not a finished visual morph.
• vs Magic Potion (A. vulgare): Both are conglobating Armadillidium. Magic Potion is the easier, ready-to-display "stacked recessive morph" already expressing the iconic look; this werneri listing is the longer-term breeding project for keepers who want to develop their own line.

Browse the full Armadillidium collection for more options.

Setting Up the Enclosure

A 6–10 litre plastic container with a secure clip-lock lid suits a starter colony of 5–10 individuals. As the colony grows and you start the breeding project, larger setups (15L+) are worthwhile. Drill ventilation holes on opposite sides for cross-ventilation, covered with fine mesh. Aim for medium ventilation — enough airflow to prevent stagnation while retaining moderate humidity.

Provide plenty of hides — cork bark flats, leaf litter, decaying wood, and flat stones replicate their natural Mediterranean rocky-grassland habitat. A. werneri are particularly happy in larger group setups where they're confident enough to be visible. Browse our accessories collection for appropriate enclosures, vents, and other essentials.

Substrate

Use a moderately moisture-retentive substrate that drains well, reflecting their Mediterranean origins:

• Organic topsoil base (pesticide-free) as the foundation
• Sphagnum peat moss mixed throughout for moisture retention
• Composted hardwood leaf litter (oak, beech)
• Flake soil mixed in for added nutrition
• Crushed limestone or eggshells distributed throughout for calcium — important for moulting and the calcified pill-bug exoskeleton
• Rotting hardwood pieces for nutrition

We recommend a topsoil and sphagnum-based mix rather than coco coir. Substrate depth: 5–8 cm — adequate for burrowing and to maintain moisture gradients.

Top layer: Generous hardwood leaf litter — magnolia leaves, oak, and beech all work well — plus cork bark flats and decaying wood for cover.

Humidity and Temperature

Maintain humidity around 50–60% with a clear moisture gradient — keep one corner consistently moist using sphagnum moss, while the rest stays drier with leaf litter and bark cover. A. werneri are Mediterranean species that handle drier conditions far better than most tropical isopods — they're drier-leaning Armadillidium, more like A. vulgare than humid-tropical species. Overwetting is a more common cause of issues than underwetting.

As one PostPods customer noted about following the website's care guidance, getting moisture right is the key to keeping isopods successfully — and for A. werneri specifically, that means moderate-with-gradient rather than uniformly humid.

Temperature should be 18–26°C — comfortably within UK room temperature year-round. Stable conditions matter more than precision; avoid sustained extremes.

Diet

A. werneri are unfussy detritivores with reasonable appetites:

• Primary diet (always available): Hardwood leaf litter (oak, beech, magnolia), rotting hardwood, decaying organic matter
• Vegetables (1–2x weekly): Carrot, courgette, sweet potato, cucumber, leafy greens. Replace within 24–48 hours.
• Fruit (occasionally): Small amounts of soft fruit
• Protein (1–2x weekly): Fish flakes, dried shrimp, dried daphnia, freeze-dried minnows. Browse our accessories collection for the full range of protein supplements. Feed protein on the drier side of the enclosure to prevent spoilage.
• Calcium (essential — always available): Cuttlefish bone, crushed limestone, oyster shell, eggshells. Particularly important for breeding females and the calcified Armadillidium exoskeleton — provide multiple sources.

Breeding the Leucistic Project

This is the heart of the listing. With A. werneri's 6-month generation cycle and the standard Mendelian inheritance pattern, a properly-managed het-carrier colony develops on the following typical timeline:

• Months 0–6: Establishment. Starter group settles, begins producing first brood. Offspring are roughly 25% leucistic (visible white-cream phenotype), 50% het carriers (look normal), 25% non-carriers (look normal).
• Months 6–12: The visible leucistic juveniles develop. Separate these from the parent colony if you want to establish a pure leucistic line — homozygous leucistic × homozygous leucistic produces 100% leucistic offspring.
• Years 1–3: Build out the leucistic-only colony to breeding adult size. A. werneri takes up to 3 years to reach full adult dimensions, so the project is genuinely long-term.

For breeding success:

• Stable temperatures within range (20–24°C is ideal)
• Consistent moderate humidity with proper gradient
• Adequate calcium for breeding females
• Regular protein supplementation
• Plenty of bark, cork, and leaf-litter hides
• Minimal disturbance during the establishment phase
• A larger starter group establishes faster and gives more breeding pairs

Important: Maintain pure colonies. To preserve the leucistic-line project, don't introduce non-carrier wild-type A. werneri from other sources — every new addition dilutes the carrier proportion. Equally, if you want to maintain the carrier line specifically (rather than developing toward pure leucistic), you can outcross to non-carrier wild-type werneri to keep producing 50% het offspring, but at a slower rate.

Pair With Springtails

Add a thriving springtail culture to any A. werneri setup. Springtails handle mould and microbial growth at a scale isopods can't manage — particularly useful around protein foods and in the moist corner of the gradient. They coexist peacefully with A. werneri and form a helpful cleanup partnership.

Who Should Buy This Listing?

Ideal for:

• Experienced keepers wanting a long-term colour-morph breeding project
• Hobbyists genuinely interested in isopod genetics and Mendelian inheritance
• Collectors building a Mediterranean Armadillidium cluster (werneri + Yellow Fellow Klugii)
• Patient keepers comfortable with multi-year project timelines
• Anyone wanting to develop their own distinct leucistic line rather than buying an existing visual morph

Not ideal for:

• Buyers wanting visually distinctive isopods today — these animals look like normal orange werneri; the value is in the recessive gene they carry
• Anyone wanting fast-breeding species — werneri are slow (6-month generation, 3 years to maturity)
• Complete beginners — start with easier species like Magic Potion or Jelly Bean before tackling a long-term breeding project
• Anyone confused about the disambiguation — please be clear this is Armadillidium werneri, not Porcellio werneri Silverback. Different animal entirely.

Realistic Expectations

They look like normal werneri. Set expectations toward orange bodies with five rows of white spotting — wild-type appearance. The genetic value is invisible without test breeding.

The leucistic offspring are the visible payoff. Expect to see the first leucistic juveniles after the first 6-month breeding cycle, in roughly 1-in-4 of offspring from carrier × carrier pairings.

This is a multi-year project. A. werneri take up to 3 years to reach full adult size, which means substantial established colonies take genuine time to develop. The reward is a long-lived stable culture and the satisfaction of working with proper recessive-morph genetics.

They conglobate. Unlike Porcellio werneri Silverback (different species, doesn't roll), this Armadillidium werneri rolls into a perfect defensive ball like all Armadillidium.

The genetics are real. Standard Mendelian inheritance applies. With proper colony management, you can develop a leucistic line at the documented ratios.

Building Your Setup

A complete A. werneri breeding setup needs a roomy enclosure, a moderately moist Mediterranean-style substrate, abundant calcium (especially limestone), generous leaf litter and bark hides, and regular protein supplementation. Browse our accessories collection for everything you need — enclosures, ventilation, leaf litter, calcium (cuttlebone, limestone, oyster shell), and protein supplements.

For the genetics background, our Isopod Genetics and Selective Breeding blog post covers leucism, albinism, and recessive-line development in detail. Browse the full Armadillidium collection for related species — or compare with the similar but smaller A. klugii 'Yellow Fellow' for the more accessible alternative.