Emerald Cockroach Care Guide (Pseudoglomeris magnifica)

Quick Answer: How Do You Keep Emerald Cockroaches?

Emerald cockroaches (Pseudoglomeris magnifica) are metallic green, day-active, tree-dwelling roaches from Vietnam and southern China. Keep them at 22-29°C with moderate humidity of 50-70%, in a tall enclosure rather than a wide one - they're arboreal and want vertical bark and branches, not floor space. Feed them fruit, but the two things they genuinely need are bee pollen and lichen. Seal the lid obsessively: every life stage climbs glass, and newborn nymphs are around 3 mm and will find any gap. They're slow: females carry young for months, produce twelve to twenty at a time, and those take the best part of a year to mature. This is a long-term project species, not a quick colony. To buy them, see our Emerald Cockroach product page for current UK stock and pricing.

The Two Things That Make Them Special

They're active in daylight

This is the one that matters, and it's genuinely unusual. Cockroaches are famously nocturnal - they hide all day and only emerge in darkness, which makes most species frustrating to keep. You buy an animal and then never see it.

Pseudoglomeris magnifica is diurnal. It's out during the day, walking about the branches, feeding, and cleaning itself in full view. For a display animal, that changes everything - and it's a large part of why keepers pay what they pay for them.

The mothers carry their babies

Emerald cockroaches give birth to live young, and the newborn nymphs climb onto the underside of the mother and stay there, clinging between her legs, through their first moult at least.

It's genuine maternal care, and it's rare enough among invertebrates to be worth pausing on. Females will also let nymphs that aren't their own climb aboard - and if there are enough of them, they'll pile onto the males too, who tolerate it without complaint. Watching a female walk around with a cluster of tiny shining nymphs gripping her undercarriage is one of the more remarkable sights in invertebrate keeping.

The practical consequence: don't disturb a female carrying nymphs. The young rarely survive long if separated from her.

A Note on the Name

Pseudoglomeris means "false Glomeris". Glomeris is the genus of pill millipedes - the ones that roll into a perfect ball. So the name translates, roughly, as "the false ball-roller".

And that's exactly right. These roaches look as though they ought to conglobate - the body shape, the armoured plates, the whole silhouette suggests it - but they can't. Their close relatives in the genus Perisphaerus can roll up; Pseudoglomeris cannot. When threatened they clamp down hard against whatever they're standing on instead, and the grip strength is genuinely surprising.

If you keep isopods or pill millipedes, you'll recognise the shape immediately - and now you know why.

What They Look Like

• Metallic emerald green - a genuine jewel-like sheen, not simply a bright colour. In some lights it shifts towards blue or bronze.
• The colour is there from the start. Nymphs already show the emerald base, and it deepens with each moult rather than fading.
• Size: 30-40 mm as adults, with females noticeably larger and heavier than males.
• Females are wingless. They're neotenous - they keep a juvenile body form into adulthood. Only the males develop wings, and they can glide short distances if startled.

Setting Them Up

• Go vertical. They're arboreal - in the wild they live on lichen-covered bark in the tree canopy. A tall enclosure with cork bark, branches and slanted bark slabs matters far more than floor area. A 10-20 litre vertical container suits a starter group of five to ten.
• Seal it . Every life stage climbs smooth glass and plastic, and newborn nymphs are around 3 mm. A tight clip-lock lid is the minimum; many keepers add a foam draught-excluder strip around the top edge. Treat escape-proofing as part of the build, not an afterthought.
• Temperature: 22-29°C. They tolerate the warmer end well.
• Humidity: 50-70%, with good ventilation. Keep about a third of the enclosure damp by misting; leave the rest drier.
• Substrate: a modest layer is fine - they spend most of their time off the ground. Add rotten wood, which they'll tunnel into, and lichen-covered branches.

Feeding

Fruit is what they'll go for first - mango, banana, apple, melon. But fruit alone won't do it.

The two things this species genuinely needs are bee pollen and lichen. They're not optional extras; they're what the animal evolved to eat, and colonies without them underperform. Offer lichen-covered branches and they'll graze on them steadily - which conveniently doubles as climbing structure.

Round it out with a little fish flake or insect jelly for protein, and a piece of cuttlebone or crushed oyster shell in one corner for calcium. Soft fruit moulds quickly, so remove what isn't eaten within a day or two.

Breeding: Set Your Expectations

They're slow. Genuinely, unusually slow, and it's the main reason they cost what they do.

• Gestation: two to six months, depending on conditions. Cool, badly ventilated or poorly fed colonies sit at the long end of that.
• Litter size: around twelve to twenty live nymphs.
• Time to maturity: eight to twelve months.
• Time to a self-sustaining colony: well over a year.

Start with a mixed-age group rather than a single cohort, so you have animals maturing at different times. Males mature roughly a month ahead of females and don't live especially long, so a group with staggered ages keeps the breeding cycle going.

One small oddity: unlike most invertebrates, they don't eat their shed skins. A discarded exoskeleton looks unnervingly like a dead cockroach, and it catches out nearly every new keeper at least once.

Are They Difficult?

Moderate. They're not delicate - they don't crash on you the way a badly-kept tropical isopod does - but they're unforgiving of a few specific things: a badly sealed lid, a diet with no pollen or lichen, and impatience.

If you've kept Madagascar hissing cockroaches successfully and want to step up to something genuinely spectacular, this is the natural next animal. If you've never kept a roach, start with hissers.

Frequently Asked Questions

What is an emerald cockroach?
Pseudoglomeris magnifica - a metallic green, day-active, tree-dwelling cockroach from Vietnam and southern China. It's one of the most colourful roaches in the world and one of the few that's genuinely enjoyable as a display animal, because it doesn't hide all day.

Are emerald cockroaches hard to keep?
Moderate. They need warmth (22-29°C), a tall arboreal enclosure, a genuinely escape-proof lid, and a diet including bee pollen and lichen. None of that is difficult, but skipping any of it causes problems. The real challenge is patience - they breed very slowly.

Do emerald cockroaches roll into a ball?
No, despite the name suggesting otherwise. Pseudoglomeris means "false Glomeris" - Glomeris being the pill millipedes that do roll up. These look like they should and can't. When threatened they clamp down hard against the surface instead.

Can emerald cockroaches fly?
Only the males, and only just - they can glide short distances if startled. Adult females are wingless entirely, because they retain a juvenile body form into adulthood.

Why are emerald cockroaches so expensive?
Slow breeding. Gestation runs to several months, litters are small (twelve to twenty), and nymphs take eight to twelve months to mature. Supply builds very gradually while demand for one of the world's most beautiful roaches stays high.

What do emerald cockroaches eat?
Fruit is what they'll take first, but bee pollen and lichen are the two things they actually need - offer both. Add a little fish flake or insect jelly for protein and a calcium source, and they'll thrive.

Do emerald cockroaches climb glass?
Yes, at every life stage. And the nymphs are around 3 mm at birth, so they'll exploit gaps you wouldn't think twice about. A tight-sealing lid is essential, and a foam strip around the rim is a sensible addition.

Where can I buy emerald cockroaches in the UK?
Our Emerald Cockroach product page has current stock, pricing and full species detail. The wider range is in our cockroaches collection.

Final Thoughts

Most cockroaches ask you to accept a trade: fascinating animal, never see it. The emerald breaks that bargain. It's out in daylight, it's the colour of polished metal, and the females walk around carrying their young underneath them like some improbable armoured marsupial.

It'll test your patience, and it'll punish a badly sealed lid. But if you want an invertebrate that stops people mid-sentence when they notice it, there isn't much competition. For substrate, bark, pollen and lichen, browse our accessories collection.