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Birupes simoroxigorum

🔤 Taxonomy

Birupes simoroxigorum is the currently accepted scientific name. The species was described in 2019. Because it entered hobby attention very quickly after description, labels should be checked carefully and wild-origin claims should be treated cautiously.

English common names used in the hobby:

  • Bornean neon blueleg tarantula
  • Neon blue leg tarantula

📌 Description

Birupes simoroxigorum is a rare Bornean tarantula known in the hobby for striking blue legs. It is a specialist display species: fast, secretive, moisture-sensitive, and unsuitable for beginners.

Adults are usually around 10-13 cm legspan. Females usually become heavier and live far longer than mature males.

The blue legs make this species visually striking, but the setup should be designed for a hidden burrow-dweller. A healthy animal may stay underground for long periods and only show legs at the entrance after dark. That is not a husbandry failure. Rehousing, photography, and sales handling are the risky moments because a frightened spider can bolt or turn defensively with little warning.

☠️ Venom

This Old World tarantula should be treated as medically significant for practical husbandry. Avoid handling, use catch cups during maintenance, and seek medical advice after a serious bite or spreading symptoms.

🌍 Distribution

Birupes simoroxigorum is known from Sarawak on Borneo, Malaysia. Its care should lean toward a humid, well-ventilated, deep-substrate setup that lets the spider stay hidden and secure rather than exposed.

Sarawak and Bornean forest conditions support a humid lower substrate, but the animal still needs oxygen-rich air in the burrow. Pack the substrate firmly enough to hold a tunnel, add a cork starter burrow, and keep only part of the depth moist. Wet, loose substrate that collapses is worse than a slightly drier surface.

Range map

⚖️ Legal status

As checked against current official CITES Appendices and EU wildlife-trade Annex references on 2026-06-01, no current CITES listing or specific EU Annex listing was found for Birupes simoroxigorum. The species is not relevant to the Bern Convention because it is not native to Europe.

Malaysian and Sarawak rules on collection and export may matter even when the species is not currently listed under CITES. Local and national rules on collection, import, sale, transport, exhibition, breeding, and proof of legal origin may still apply. Captive-bred animals from traceable sources are strongly preferred.

The species became desirable soon after description, so legal origin matters more than a simple listing check. Ask for captive-bred status, parentage if available, and import paperwork for animals that moved between countries. Avoid animals advertised with collection stories, unclear export route, or no seller accountability.

🤌 Husbandry

Birupes simoroxigorum should be housed alone. It is not a communal tarantula.

Use smaller secure containers for spiderlings and juveniles, then upgrade gradually. For an adult, a practical enclosure is about 30 x 30 x 35 cm, adjusted around the animal’s build and behavior.

Useful care priorities:

  • Deep compact substrate
  • Started burrow or cork tunnel
  • Very secure lid or doors
  • Fresh water dish
  • Moist lower layers with good ventilation

Spiderlings and juveniles need secure containers with enough depth to start a burrow, but not so much space that maintenance becomes blind. Give a starter tunnel against the side if possible; it lets the keeper see part of the retreat without opening it. Upgrade before the spider outgrows the burrow, not after it has webbed every vent.

Adults should be managed as no-contact animals. Use locking doors, check ventilation gaps with feeder insects in mind, and keep a catch cup available before the enclosure is opened. Rehousing is best done with a catch cup and patience, not with bare hands or repeated poking. A defensive Old World tarantula should be given a retreat, not challenged.

Routine cleaning should be minimal. Remove boluses, uneaten prey, and dirty water, but do not dismantle a stable burrow system unless there is mold, collapse, parasite concern, or a genuine medical need. Destroying the retreat often causes more stress than the problem being solved.

💡 Lighting

No specialist lighting or UVB is required. A normal room day-night rhythm is enough; any plant light should not overheat or dry the enclosure.

🌡 Heating and temperature

A practical daytime range is about 23-27°C, with a night drop around 20-23°C. Avoid hot lamps aimed at a small enclosure; warming the room is usually safer than creating a dry hot spot.

Keep the range warm and steady rather than hot. High heat in a small humid enclosure can dehydrate the spider quickly and make a defensive species more reactive. Use two thermometers if the enclosure is tall or deep: one near the retreat entrance and one near the upper ventilation. Avoid heating mats under deep substrate because the spider may dig toward dangerous heat.

💧 Humidity and water

Aim for about 70-85% with fresh water always available. The goal is usable microclimates: not bone dry, not wet throughout, and never stale.

The lower substrate should hold moisture, but the burrow must not become a sealed wet chamber. Pour water down one side or around the dish so moisture moves downward, then let the surface and entrance breathe. Heavy misting can trigger bolting and leaves wet webbing that spoils airflow. If condensation stays on the walls all day, increase ventilation or reduce watering.

🌿 Enclosure and decoration

Use substrate that holds shape, stable cork or hide pieces, and enough cover for the spider to retreat completely. Avoid mesh surfaces that can catch claws, unstable hard decor, and excessive height for terrestrial or fossorial species.

Depth and security matter more than decoration. Use firm substrate, a cork tunnel or bark section, and enough height above the substrate for webbing without creating a dangerous fall zone. The water dish should remain accessible even after the spider webs heavily around the entrance.

Ventilation should cross the enclosure rather than only venting at the top. Fossorial tarantulas can keep the entrance partly closed for long periods, so stale air inside the burrow is a real risk. Secure every opening before feeding insects are added; prey escapes often reveal spider escape gaps too.

🪳 Feeding

Feed suitable live insects such as roaches, crickets, locusts where legal, and occasional mealworms or superworms. Juveniles usually eat more often; adults commonly do well on an appropriately sized meal every 7-14 days. Remove uneaten prey promptly, especially before a molt.

Feed according to body condition rather than excitement at the tongs. A rounded but not swollen abdomen is the target. Spiderlings can take small prey more often, while adults usually do better with one suitable meal every 7-14 days and longer pauses before molts or seasonal slowdowns.

Use prey no larger than the spider can subdue safely. Roaches, crickets, and locusts where legal are useful staples; mealworms and superworms should not be left to burrow into the substrate. Remove uneaten prey within a few hours, and always remove live prey when the spider is in premolt or has just molted.

🩺 Common problems

Common problems include dehydration, stale wet substrate, overheating, falls, escape during maintenance, and difficult molts. A tarantula resting on its back is often molting and should not be disturbed.

The most serious routine problems are escape, overheating, stagnant wet substrate, and risky maintenance. A defensive posture is not a behavior to test; it is a sign to close the enclosure and work more slowly later. If the burrow smells bad, collapses, or grows persistent mold, move the spider with a catch cup and rebuild the setup rather than stirring the tunnel while the spider is inside.

Watch for dehydration, failed molts, leg damage, abnormal weakness, and refusal to retreat. Old World tarantulas can deteriorate quickly after a bad bite incident, fall, or overheated enclosure, so prevention is the main safety tool.

📌 Conclusion

Birupes simoroxigorum is best reserved for experienced keepers who can provide stable humid substrate, strong security, and hands-off care. Its rarity makes legal origin and captive-bred sourcing especially important.

This is a specialist display spider, not a handling animal. Buy only when legal origin is clear and when you already have the tools and confidence to maintain a fast defensive burrower without direct contact.

📚 Sources and further reading