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Chilobrachys natanicharum

🔤 Taxonomy

Chilobrachys natanicharum is the currently accepted scientific name. The species was formally described in 2023 after being known in the pet trade under electric-blue Chilobrachys labels. Accurate naming matters because several Chilobrachys species can look similar in trade.

English common names used in the hobby:

  • Electric blue tarantula
  • Electric blue earth tiger

📌 Description

Chilobrachys natanicharum is the electric-blue Thai Chilobrachys described from southern Thailand. It is a fast, defensive, heavy-webbing fossorial species for experienced keepers only.

Adults are usually around 13-16 cm legspan. Females usually become heavier and live far longer than mature males.

This is not a blue display ornament that stays where it is placed. It is a fast Old World tarantula that will often convert the enclosure into a webbed burrow system. Expect a lot of webbing, excavated substrate, and sudden defensive posture if the retreat is opened. The keeper should value secure observation more than visibility.

☠️ Venom

This species should be treated as medically significant. Avoid handling entirely, use tools and catch cups for maintenance, and seek medical help after a serious bite, allergic reaction, or systemic symptoms.

🌍 Distribution

Chilobrachys natanicharum is known from southern Thailand, including humid forest and mangrove-associated habitats. Captive care should emphasize deep, stable substrate, retreat security, moisture below the surface, and strong airflow.

The Thai locality information supports warm, humid, retreat-rich care, but not stagnant swamp conditions. Give the spider deep packed substrate, a cork tunnel, and ventilation above the web layer. The lower substrate can stay moist while the surface and entrance remain cleaner and better aerated.

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 Chilobrachys natanicharum. The species is not relevant to the Bern Convention because it is not native to Europe.

Thai collection, export, and wildlife rules 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.

Because the species was formally named after years of trade under electric-blue labels, proof of identity and origin is important. Keep the invoice, breeder details, country of purchase, and any export or import paperwork. Do not assume that a non-CITES status makes collection or export from Thailand unrestricted.

🤌 Husbandry

Chilobrachys natanicharum 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 45 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 24-28°C, with a night drop around 21-24°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

Chilobrachys natanicharum is impressive but unforgiving. It belongs with keepers who can manage a fast Old World spider, maintain humid substrate without stagnation, and keep every enclosure opening escape-proof.

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