Ardentiella Isopods for Sale UK

Ardentiella - the genus formerly known as Merulanella - are among the most visually striking isopods in the hobby. Native to Vietnam and surrounding regions of Southeast Asia, they're instantly recognisable for bold colouration (deep reds, yellows, oranges and blacks), large size for a tropical isopod, and a boldness most other genera don't match. Unlike the shy, burrow-dwelling species most keepers are used to, Ardentiella are semi-arboreal, surface-active, and visible during the day as well as at night. You actually see these isopods - which, combined with the colours, is why collectors pay premium prices for them.

Every Ardentiella isopod sold here is captive-bred. That matters more with this genus than almost any other: wild-caught Ardentiella have a reputation for dying off within weeks, which is where most of the genus's "fragile" reputation comes from. Stabilised captive-bred lines are dramatically more forgiving - still demanding, but genuinely keepable with the right setup.

Dispatched Monday to Thursday by Royal Mail next-day, with a live arrival guarantee and 20% overcount as standard.

Morphs We Stock

Ember Bee · Scarlet · Red Diablo · Thunder Dragon · Batman · Red Phoenix · Phoenix · Pastel · Lava · Tri Colour

Before You Buy: Honest Care Notes

Ardentiella are rated hard across the genus, and the difficulty is real. All morphs share the same fundamental requirements, and the same two issues crash most colonies:

• Ventilation versus humidity. They need 60-75% humidity and excellent airflow at the same time. Stagnant humid air is lethal. Cross-ventilation - mesh vents on opposite sides of the enclosure - is essential.
• Frass buildup. Ardentiella are unusually sensitive to their own waste acidifying the substrate. Replace the substrate every six months at minimum, sooner if it looks spent.

They also prefer cooler temperatures than most tropical isopods (19-26°C, and the lower end is better), and they can climb smooth plastic - so enclosures must be genuinely escape-proof.

If you haven't kept tropical isopods before, start with a hardier species like Dairy Cow or Powder Blue and work up to Ardentiella once you're comfortable managing humidity and airflow. Losing a premium colony to avoidable mistakes is an expensive way to learn. Our Ardentiella care guide covers the husbandry in full.

Frequently Asked Questions

Is Ardentiella the same as Merulanella?
Yes. The genus was reclassified following morphological and genetic analysis - what was sold as Merulanella sp. "Ember Bee", "Phoenix" or "Tricolor" is now correctly Ardentiella sp. The animals and their care haven't changed, and you'll still see both names used across the hobby.

Why are Ardentiella isopods so expensive?
Three reasons: slow growth, a moderate breeding rate, and high demand from collectors. Add the time and care needed to keep captive-bred colonies stable in UK conditions, and supply stays tight while demand doesn't.

Are Ardentiella good for beginners?
No. They're a hard-difficulty genus - they need the humidity-versus-ventilation balance right, cooler temperatures than most tropicals, escape-proof enclosures, and regular substrate replacement. Build your husbandry on a hardy species first, then step up.

Can I keep Ardentiella in a bioactive vivarium with my reptile?
We don't recommend it. They want cooler temperatures than most reptiles need, they can climb out through typical vivarium ventilation, and they're territorial towards other isopod species. Keep them in a dedicated enclosure.

What temperature do Ardentiella need?
19-26°C, and they do better towards the lower end of that range. They're notably cooler-running than Cubaris, which catches out keepers who assume all tropical isopods want the same warmth.

Browse the wider range in isopods for sale, and pair any colony with springtails to help keep the substrate clean between changes.