Eoperipatus totoro is a velvet worm from southern Vietnam, formally described in 2013, and it is still the only velvet worm ever described from that country. It is also not an insect, not a worm, and not quite an arthropod — which is most of the reason keepers want one.
Quick answer
- Phylum Onychophora — a separate lineage from the arthropods, with roughly 230 living species worldwide.
- Around 6 cm long, soft-bodied, with stubby unjointed legs and a velvet-textured cuticle.
- Hunts by firing adhesive slime from a pair of papillae beside the mouth, then eating the prey out of its own glue.
- No waterproof cuticle. It dries out faster than almost any other terrestrial invertebrate, and that single fact drives the whole set-up.
- Peripatidae give birth to live young. Reproduction is slow and captive-bred stock is genuinely scarce.
- Room temperature, constant damp, deep leaf litter, small live prey.
What it actually is
Velvet worms sit outside the arthropods as their own phylum. Where an insect has hard jointed limbs, an onychophoran has soft lobopods that work by hydrostatic pressure — the same principle as a caterpillar’s prolegs, but on a body plan that has been recognisably itself for a very long time. In the Peripatidae, males carry 23 pairs of legs and females 24.
They are ambush predators. Rather than chasing, they approach slowly and then discharge two jets of proteinaceous slime that set almost instantly, pinning small prey in place. The animal then bites through the cuticle, injects saliva, and feeds. It is one of the few genuinely alien-looking behaviours you can watch happen on a kitchen table.
Why this species specifically
The first specimens were collected in Cát Tiên National Park in Vietnam from late 2007 onward. A Vietnamese team published the first record of onychophorans in the country in 2010, and the formal description followed in 2013 in Zoologischer Anzeiger, led by Ivo de Sena Oliveira, using both scanning electron microscopy and molecular data.
The name is not a taxonomist’s joke at the animal’s expense. The collectors asked for it: watching the animal move reminded them of the many-legged Catbus from Miyazaki’s My Neighbour Totoro, and the describing team honoured the request.
Before that description, Southeast Asian Eoperipatus had been so heavily lumped together that at one point every described species in the genus was folded into a single name. The 2013 work argued the opposite — that the region holds far more onychophoran diversity than anyone had catalogued. That is the kind of group where a captive population has real value, which is why ours is documented in the SpeciesVault registry rather than just listed and sold.
Keeping them
| Requirement | Detail |
|---|---|
| Enclosure | Small and sealed. A large enclosure is harder to keep evenly damp, and these animals do not need space |
| Substrate | Deep damp leaf litter over coco fibre or forest soil, with bark and rotten wood to shelter under |
| Humidity | Constantly high. Damp, never waterlogged, never allowed to dry back |
| Temperature | Room temperature. Heat is a hazard, not a requirement — warm plus dry kills quickly |
| Ventilation | Enough to prevent stagnation and mould, no more. This is the hardest balance in the set-up |
| Food | Small live prey — pinhead crickets, small roach nymphs, isopods, springtails — every few days |
| Housing | They tolerate company and can be kept in small groups |
The single most useful mental model: this animal is a piece of the forest floor that happens to be alive. It has no waterproofing, it never voluntarily leaves cover, and in the wild it comes to the surface mainly in the wet season. Build a permanently humid litter layer and leave it alone, and they are far less demanding than their reputation suggests. Let the enclosure dry out once and you will not get a second chance.
A working isopod and springtail cleanup crew is close to mandatory here, because a permanently damp box with uneaten prey in it goes wrong fast. The bark and leaf litter side of the set-up is in terrarium supplies.
Buying one honestly
Most velvet worms in the trade are wild-collected, and they travel badly. Ours are captive bred, which for this group is unusual enough to be worth stating plainly rather than in marketing language. Our current listing is Velvet Worm (Eoperipatus totoro) for sale, offered as a single, a pair or a 3 Count, and everything ships under our live arrival guarantee.
If you want something in the same damp-detritus world that is far more forgiving of a mistake, start with millipedes and millipede care. How we handle provenance across the whole catalogue is in about Terrarium Station.
Common questions
Is a velvet worm an insect?
No. Velvet worms are their own phylum, Onychophora, sitting alongside the arthropods rather than inside them. They have soft unjointed legs and no hard exoskeleton.
How big does Eoperipatus totoro get?
Around 6 cm, roughly two and a half inches. They are small, slow and easy to overlook in a planted enclosure.
How do velvet worms catch prey?
They squirt adhesive slime from a pair of papillae either side of the mouth. The slime sets on contact and immobilises the prey, which the velvet worm then bites into and feeds on.
Why is it called totoro?
The collectors of the first specimens asked for the name. The animal’s movement reminded them of the many-legged Catbus in Miyazaki’s My Neighbour Totoro, and the describing team used it.
Are velvet worms hard to keep?
They are unforgiving rather than complicated. They have no waterproof cuticle, so a single dry-out is usually fatal. Get constant humidity and a stable room temperature right and the rest is straightforward.