Field identity
Pygmy Woodlouse Isopods (Trichoniscus pusillus)
Trichoniscus pusillus
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Pygmy Woodlouse Isopods (Trichoniscus pusillus)
$12.00 -
$60.00
Small in size, big on activity. Pygmy Woodlouse isopods (Trichoniscus pusillus) are one of the smallest isopods you can keep, native to Europe and now found in temperate regions elsewhere. Despite their size, they move quickly and stay visibly active across the substrate surface.
This species prefers cooler temperatures and consistently high moisture compared to many isopods, with a lighter calcium need. It is a great pick for keepers who want a species built specifically for cool, damp microhabitats.
- One of the smallest isopod species available
- Fast-moving and consistently active
- Prefers cool, consistently moist conditions
- Great fit for cool-climate bioactive builds
Covered by our Live Arrival Guarantee.
Care Snapshot
| Climate | Temperate |
| Temperature | 60 to 72 F |
| Humidity | 75 to 95% |
| Adult size | 3 to 5 mm |
| Origin | Europe; introduced elsewhere |
| Care level | intermediate |
From the keeper’s royal archives
Pygmy Woodlouse Isopod Care Guide
Prepare their refuge, gather provisions, and follow the care journey for Trichoniscus pusillus. Explore habitat, moisture, feeding and colony care before your companions arrive.
Open the kingdom care sheet →Know your colony
Care and Keeper Confidence
Plan a welcoming habitat before your colony arrives. Start with the care guide for the species you have chosen.
Best matched for
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Keeper caution
Match moisture, ventilation, and space to your chosen species. Check its care guide before setting up.
Direct answers
Before this colony arrives
Prepare the refuge, gather provisions, and plan your first days as colony keeper.
What should I prepare?
Stabilize the enclosure before ordering. Use the temperature and moisture fields above when they are shown, and provide species-appropriate substrate, leaf litter, hides, calcium, and ventilation.
How should I compare this listing?
Keepers choosing a colony that suits their enclosure, experience, and care routine. Match moisture, ventilation, and space to your chosen species. Check its care guide before setting up.
What will my selected option mean?
The selected product option is carried into the cart and checkout. Review the option label, price, and current availability directly above before placing the order.
Where can I ask a species question?
Contact keeper support with the product name and your planned enclosure. We can help you choose the next step.