Purple Earth Tiger Tarantula (Cyriopagopus sp hati hati)

Physical description and identification

The purple earth tiger is a large, long-legged Southeast Asian tarantula built for climbing rather than digging — at least once it is grown. Its signature is a cool violet sheen across the legs and abdomen set against a distinctly paler, tan to light brown carapace; that contrast is the quickest way to place it.

Adults

• Size: adult females span roughly 13–16 cm (5–6 in) across the legs, with a body length around 6 cm. Males mature smaller and duller, with a slimmer abdomen and proportionally longer legs.
• Colour: the purple is a sheen rather than a pigment wash — it comes and goes with the angle of the light, is strongest on the femora and the top of the abdomen, and peaks in the days after a moult. As the hairs wear the animal drifts toward bronze-brown, while the carapace stays pale.
• Eyes: eight small eyes crowded on a single raised tubercle. Vision is poor; the spider works by touch and by vibrations picked up through the legs.
• Distinctive features: as an Old World theraphosid it carries no urticating hairs. It cannot kick a cloud of irritating bristles the way a Mexican red knee can, so its whole defensive repertoire is speed, a threat posture and the fangs. The display is unmistakable: the body rears back, the front legs lift high and the long black fangs swing down into strike position.

Eggs

The female lays a clutch of yellowish-orange eggs onto a silk mat she has spun inside her retreat, then folds and rolls the mat into a closed sac. She holds it, turns it and moves it around the tube as temperature and humidity shift, and will not tolerate any intrusion.

Spiderlings

Spiderlings behave nothing like their parents. They are ground animals: after dispersing they dig or occupy small burrows, seal them with silk and live underground. The switch upward is gradual — as juveniles put on moults they climb more, and by sub-adult size most have left the soil for tree hollows and bark crevices. The purple develops only in later instars.

The web or hunting

No catching web is built. Silk lines and reinforces the retreat: a juvenile lines its burrow, an adult the inside of a hollow limb, a split trunk or a gap behind loose bark, often extending a short collar of silk from the opening. Threads spread across the surrounding bark as trip-lines; when something crosses them the spider bursts out, seizes the prey and drags it inside. For how this differs from an orb weaver’s snare, see our guide to spider webs.

Where the purple earth tiger tarantula lives

This is an Indonesian species, and the animals in circulation are attributed to Sumatra. It is an undescribed Cyriopagopus, and "sp. hati hati" is a working label rather than a formal name, so published data on its distribution is thin. Related arboreal Cyriopagopus occur across the Sunda region, including Peninsular Malaysia and Borneo, and trade names such as "Borneo purple earth tiger" are applied loosely to several spiders in this group. Treat any single-island claim as provisional until the species is described.

Its habitat is humid tropical lowland forest. Adults live off the ground in hollow branches, split trunks, rot cavities and gaps behind loose bark, usually a few metres up in damp shade; juveniles stay on the forest floor in burrows among roots and litter. Dependence on mature trees with cavities makes the species sensitive to logging and to plantation conversion across lowland Sumatra.

Are purple earth tiger tarantulas venomous?

Yes, and the common comparison to a bee sting is misleading: that description fits the New World pinktoes, not this spider. The purple earth tiger is an Old World theraphosid with no urticating hairs, and bites from this group are documented as far more severe than those from New World tarantulas — intense local pain, pronounced swelling and, most characteristically, muscle cramps and spasms that begin hours after the bite and can last several days, sometimes away from the bitten limb. Fever, nausea and lasting fatigue are also on record.

Nothing here is life-threatening: no death has been attributed to any Cyriopagopus bite and no antivenom exists, because none is needed. The risk is prolonged, severe pain. Dogs and cats react more strongly than people and should be kept well away.

Can purple earth tiger tarantulas bite?

They can, and this species has one of the shorter fuses in the family. Its reputation for being defensive is deserved: quick to take up the threat posture, quicker to abandon it in favour of striking, and fast enough to close a gap before a person reacts. It is not aggressive in the sense of seeking confrontation — the first choice is always to shoot back into the retreat — but the window between warning and bite is narrow, and handling is simply not an option.

If you are bitten: move out of reach of the spider before doing anything else. Wash the puncture with soap and water, apply a cold pack, keep the limb still and elevated if that helps. Photograph the spider if it is safe to do so; the species matters to a clinician. The fangs are long, so the immediate pain is partly mechanical. Watch for cramping over the following hours and seek medical care if cramps spread, if swelling is marked, or if you feel faint or feverish. Treatment is supportive — analgesia, muscle relaxants, observation. Do not cut, suck or apply a tourniquet.

Ecological importance and behavior of the purple earth tiger tarantula

The purple earth tiger is a nocturnal ambush predator working a layer of the forest that ground-dwelling tarantulas never reach. Sitting just inside a hollow limb with its front legs on the silk at the entrance, it takes crickets, roaches, katydids, moths, beetles and termites; adults occasionally take a small lizard or tree frog. Prey is struck, pulled inside and fed on over hours.

Natural predators: spider-hunting wasps are the specialist enemy, locating a retreat, paralysing the occupant and sealing an egg onto it. Arboreal snakes, monitor lizards, civets and large birds take spiders caught in the open at night, and spiderlings are eaten by ants, centipedes and larger spiders. The retreat is the main defence.

Prey-predator dynamics: the shift from burrow to tree hollow means the species occupies two food webs in turn — competing with ground predators for litter arthropods as a spiderling, then taking large flying and climbing insects as an adult. Because adults need cavities in mature trees, their density is set less by prey than by how many hollows a patch of forest holds.

Seasonal behavior: activity tracks humidity and prey abundance rather than a temperate season. Mature males leave their retreats to search for females and live only months afterwards, while females keep moulting, feeding and producing egg sacs for a decade or more.

Relationship with humans: this is a forest animal most people will never meet. It reaches the wider world through the specialist keeper trade, where it is strictly a display species — a tall enclosure with a cork retreat, humidity with real ventilation, no handling. The greater human impact runs the other way: forest clearance in Sumatra removes the trees whose cavities the adults need.

Similar tarantulas and how to tell them apart

Quick facts

Did you know?

• This spider has no scientific name of its own. It is an undescribed Cyriopagopus, and claims that "Simon described it in South Sulawesi in 1887" confuse the spider with the genus: 1887 is the year Eugène Simon erected Cyriopagopus itself.
• Hati-hati is the everyday Indonesian and Malay phrase for "be careful" — the sort of thing printed on a road sign. As a spider name it doubles as a temperament rating.
• It changes address as it grows. Spiderlings are committed burrowers; adults live in tree cavities. Very few tarantulas swap one lifestyle for the other within a single lifetime.
• The genus swallowed a famous name: Haplopelma, still printed on older labels, was synonymised with Cyriopagopus — which is why the Asian earth tigers seem to keep changing names.

In summary, the purple earth tiger is a beautiful, poorly documented Sumatran tarantula. It is not dangerous to life, but it is not a bee sting either: no hairs, a fast temper and a bite that cramps for days.