The Lava Pastel is a cultured morph within the Ardentiella genus that combines the warm orange-red tones of the standard Lava with the softer, muted expression characteristic of Pastel morphs. The result is a distinctive isopod showing gentle salmon, peach, and coral hues with diffuse patterning rather than the bold colour blocks of standard Lava. It's a premium display morph — pretty, rare, and priced accordingly.
At £80 for 5, £150 for 10, or £290 for 20, this is firmly collector-tier pricing. Ardentiella species in general sit at the top of the isopod market, and Lava Pastel is one of the more unusual morphs in that already-premium group.
A Glimpse
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Scientific Name: Ardentiella sp. 'Lava Pastel' (formerly Merulanella sp.)
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Origin: Cultured morph derived from Ardentiella sp. 'Lava' (originally Vietnam)
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Family: Armadillidae
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Adult Size: 18–25 mm
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Difficulty: Hard — not a beginner species
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Rarity: Very Rare
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Temperature: 19–26°C (cooler end preferred)
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Humidity: 60–75% with strong ventilation
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Breeding: Moderate for captive-bred stock; wild-caught individuals are challenging
What "Pastel" Means in Ardentiella
Pastel morphs across the isopod hobby share a common characteristic: softer, lighter, more diffuse colouration compared to their base morph. The pigments are still there but at reduced saturation, giving animals a washed-out, watercolour quality rather than the bold colour blocks of standard morphs.
In Lava Pastel specifically, the fiery orange-red tones of the original Lava become softer salmon, coral, and peach. The dark contrast areas are less intense. The overall effect is gentler and more aesthetic — some keepers prefer this subtle expression over the vivid intensity of standard Lava.
Like all Ardentiella morphs, individual colour expression varies. Some animals in a Lava Pastel colony will lean more towards the base Lava intensity while others show the full pastel expression. Broods may produce a mix. This natural variation is part of what makes Ardentiella collecting rewarding — each colony develops its own character over generations.
If you're building an Ardentiella collection, Lava Pastel pairs well with the standard Lava, Pastel, Batman, and Yellow Phoenix morphs for visual variety across the genus.
Genus Name — Ardentiella vs Merulanella
You'll see both names in circulation. Ardentiella is the updated genus name following a recent taxonomic revision of what was previously classified as Merulanella. The animals are the same — only the scientific name has changed. Anything sold as "Merulanella sp. Lava Pastel" is this species. The care, behaviour, and breeding requirements are identical regardless of which name is used.
Should You Start Here?
Honestly, no — not unless you have experience with demanding tropical isopods. Lava Pastel sits at the top of the difficulty curve, and at this price point, losing animals to husbandry mistakes is a genuine financial cost.
Appropriate background before buying:
- You've successfully kept Cubaris species (Rubber Ducky, Panda King, Cappuccino, etc.) for at least 6 months with stable colonies
- OR you've kept other Ardentiella morphs successfully and understand the genus-specific quirks
- You have a proper setup ready before animals arrive — not something you're cobbling together after the purchase
If you're coming from beginner isopods like Porcellio scaber or standard Armadillidium, consider a less expensive Ardentiella morph or a mid-range Cubaris first. Our setting up guide covers the progression route properly.
⚠️ Escape-Proof Enclosure Essential
This is the single most important practical consideration with Ardentiella. Mancae (babies) and juveniles can climb vertically on smooth plastic — like roaches. If your enclosure has any lid gaps, poor clip seals, or smooth vertical surfaces leading to openings, you will lose animals.
Use a tightly sealed enclosure with reliable lid clips. Inspect every seam for gaps larger than 1 mm. Taller enclosures are better than shallow ones because they give you more margin at the top before climbing mancae reach the lid. Losing £80–290 worth of rare mancae to escapes is entirely preventable if you build the enclosure correctly from the start.
Our accessories collection has escape-proof enclosures and proper ventilation fittings.
Ventilation — Balance With Humidity
Ardentiella need both high humidity and strong airflow. Stagnant humid air is more damaging than marginally lower humidity with good ventilation. This balance is the core challenge of keeping this genus successfully.
Use cross-ventilation — vents on opposite sides of the enclosure — to create actual airflow through the space rather than just adding holes. Single-side ventilation produces dead air. Mesh sections or multiple smaller vents work better than large single openings.
Humidity target: 60–75%. Maintain by misting rather than saturating the substrate. The substrate should be moist but not waterlogged — squeezing a handful should release a few drops at most, not produce a stream of water.
Substrate and Layered Setup
Ardentiella thrive in layered setups that mimic their Vietnamese forest floor origins.
Base layer (4–5 cm): Organic topsoil mixed with flake soil. Keep moist but not saturated.
Middle layer: Pieces of rotting white hardwood and kinshi. Both provide food value and structural complexity. Lava Pastel — like all Ardentiella — actively feeds on fungal-decomposed wood.
Top layer: Generous leaf litter using magnolia leaves for long-lasting cover and bamboo leaf litter for airflow. Sphagnum moss patches in corners help maintain localised humidity without making the whole enclosure too wet.
Vertical structure: Multiple cork bark pieces, twigs with lichen where possible, and angled hides. Ardentiella are semi-arboreal and will use vertical space actively. A flat 2D setup wastes their natural behaviour.
Temperature
19–26°C, with the cooler end preferred. Unlike some tropical isopods, Ardentiella don't need high temperatures — they actually do better slightly on the cool side of room temperature. In UK summer, monitor temperatures carefully; sustained exposure above 27°C causes stress. In winter, room temperature is typically fine without supplementary heating in most homes.
Diet
Primary diet is leaf litter, rotting white wood, and fungal-decomposed material. Supplement regularly with:
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Protein — dried gammarus shrimp, fish flakes, dried bloodworm. Offer 2–3 times weekly in small quantities. Supports moulting and reproduction.
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Vegetables and fruit — small pieces of cucumber, courgette, sweet potato, carrot. Remove uneaten portions before they mould.
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Moss and lichen — often preferred over fresh produce. If you can source clean lichen-covered twigs, Ardentiella love them.
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Kinshi — long-term food source that also serves as substrate structure.
Not accepted: Bee pollen, commonly recommended for other isopods, is generally ignored by Ardentiella. Don't rely on it for this species.
Calcium
Non-negotiable for Ardentiella, especially at this price point. Losing animals to moulting problems from calcium deficiency is avoidable and expensive.
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Cuttlebone — always available in the enclosure
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Malawi Limestone — passive calcium source plus habitat structure
- Crushed oyster shell or eggshell as supplementary options
Pair With Springtails
Add a thriving springtail culture from day one. Ardentiella produce significant frass in humid enclosures, and springtails break this down before it causes air-quality or bacterial issues. This isn't optional for Ardentiella — consider springtails part of the core setup.
Captive-Bred vs Wild-Caught
Captive-bred (CB) Ardentiella are notably easier to establish than wild-caught (WC) specimens. CB stock is already adapted to typical hobbyist conditions and breeds moderately to prolifically once settled. Wild-caught Ardentiella are famously difficult — high acclimation mortality, inconsistent breeding, and elevated husbandry sensitivity.
Expect a settling period as any new colony adjusts to your specific enclosure conditions. Avoid opening and disturbing the enclosure frequently during the first 2–4 weeks. Once established, the colony should self-sustain with steady population growth over 6–12 months.
Pairs Well With
The complete Lava Pastel setup requires:
For more on the genus, browse our full Ardentiella collection or read the guide to isopod genetics, colours, and morphs — particularly relevant for understanding how pastel expressions work across isopod species.
