Melopoeus lividus

🔤 Taxonomy

Melopoeus lividus is the currently accepted scientific name. In older hobby material, the species was very widely encountered as Haplopelma lividum.

The latest rename that hobbyists most often encounter is:

• Haplopelma lividum -> Melopoeus lividus (current accepted placement)
• Cyriopagopus lividus -> Melopoeus lividus (World Spider Catalog, 2026)

English common names used in the hobby:

• Cobalt blue tarantula

German common names used in the hobby:

• Kobaltblaue Vogelspinne

📌 Description

Melopoeus lividus is a famous Old World Asian tarantula known for deep cobalt-blue legs and a strongly defensive fossorial lifestyle. It is not a handling species and spends much of its time inside the burrow.

Adult size is usually about 5-6 cm body length and about 12-14 cm legspan, with females typically heavier than mature males.

Its appeal is based on color, webbing, and burrow structure rather than on constant visibility.

This is an advanced display animal. It is fast over short distances, lacks the urticating hairs used defensively by many New World tarantulas, and may stand its ground when its retreat is disturbed. A well-settled specimen is often straightforward to maintain because most work can be done without exposing it, but mistakes during rehousing or excavation leave little reaction time.

Females may live well over a decade, whereas mature males are slimmer, wander more, and have a much shorter adult life. Sex cannot be established reliably from color alone; examination of a well-preserved molt is the safer method.

☠️ Venom

Melopoeus lividus should be treated as a medically significant tarantula. A bite can cause intense local pain, swelling and, in some cases, wider symptoms such as muscle pain, cramping, nausea, dizziness or prolonged discomfort.

Routine pet care does not use a species-specific antivenom for these bites. Avoid handling, work the enclosure so contact is unlikely, and seek medical advice after a serious bite, allergic reaction, breathing difficulty, spreading symptoms, or any bite involving a child or vulnerable person.

The enclosure should be kept in a room that children and free-roaming pets cannot enter during maintenance. Before opening it, close doors and windows, block obvious gaps, prepare a rigid catch cup and lid, and decide where every tool will go. Long forceps help move a water dish or prey remains, but they are not a reason to provoke the spider or reach into its tunnel.

🌍 Distribution

Melopoeus lividus is native to mainland Southeast Asia, especially Myanmar and Thailand. In the wild it is associated with humid monsoon forest soils and deep self-made burrows.

World Spider Catalog currently supports Myanmar and Thailand; older trade pages sometimes give a wider Southeast Asian range without traceable locality evidence. Keep locality labels from reputable breeders, but do not turn an unverified sales label into a biological range claim.

The burrow is the relevant microclimate. Soil below the surface changes temperature and moisture more slowly than open air, allowing the spider to retreat from hot, dry, or very wet conditions. Captive care therefore depends more on stable, moisture-retaining soil with ventilation above it than on repeatedly misting the visible surface.

The care setup should reflect those conditions with:

• a low terrestrial enclosure with deep, shape-holding substrate
• a secure hide and room to retreat below the surface
• moderate humidity with good ventilation, not stale wet substrate
• fresh water always available
• fall prevention and calm maintenance

🌡 Climate across the native range

Monthly climate normals from reviewed representative locations within the documented native range; the GBIF records identify the genus, not the species:

Weather data by WorldClim v2.1 · Monthly normals queried by Herpeton Academy from raster values; relative humidity is derived from vapor pressure and mean temperature.

Location references use GBIF.org occurrence data where available; original occurrence records retain their source dataset licenses.

⚖️ Legal status

As checked against current official CITES and EU wildlife-trade references on 2026-06-03, no current CITES listing or species-specific EU Annex listing was found for Melopoeus lividus. The species is not relevant to the Bern Convention because it is not native to Europe.

Local rules on import, sale, transport, and proof of legal origin may still apply. Captive-bred animals are preferable.

Keep the invoice, seller or breeder contact, purchase date, the scientific name used at sale, and any import or transfer papers. Because this species has circulated as Haplopelma lividum and Cyriopagopus lividus, retaining those older names in the record helps connect the animal to its documentation after taxonomic changes.

🤌 Husbandry

This species should be kept alone in a secure fossorial setup. An adult is often kept in a terrestrial enclosure with substantial substrate depth rather than in a decorative arboreal setup.

Start slings in small, escape-proof containers where prey, molts, and hydration can be checked easily, then move them up in stages as they grow.

Useful basics include:

• Deep packed substrate
• A started burrow
• Good lid security
• Good ventilation
• Low disturbance

For an adult female, a secure enclosure around 30 × 30 × 40-45 cm can work when at least 25-30 cm of the height is filled with substrate. The exact external dimensions matter less than providing a stable tunnel, a reachable water dish, and enough clearance to service the enclosure without placing a hand over the burrow entrance. Ventilation holes must be smaller than the spider’s carapace, and sliding or lifting lids must latch positively.

Offer a starter tunnel down one side by pressing a narrow channel beneath an angled piece of cork. This encourages construction near the wall, which may allow observation without forcing the spider into view. Once it has webbed and excavated the entrance, do not repeatedly rearrange it. A sealed entrance commonly indicates premolt or simple retreat maintenance, not an emergency.

Slings need the same principles at a smaller scale: several body lengths of diggable substrate, tiny escape-proof ventilation, and moisture available below the surface. Move a juvenile only when its present container prevents safe watering, feeding, or growth. Prepare the new enclosure and a larger secondary containment tub before beginning; never attempt a free-hand transfer.

Routine work should follow a fixed sequence:

• Locate the spider or confirm that the tunnel is closed.
• Open only the smallest service gap needed.
• Refill water and remove accessible remains with long tools.
• Close and latch the lid before moving other equipment.
• Record feeding, refusals, molts, and unusual surface activity.

💡 Lighting

Tarantulas do not need specialist lighting; a regular room day-night rhythm is enough.

Bright lighting is usually unnecessary and may keep the spider hidden even more.

A gentle 10-12 hour room photoperiod is sufficient. If plants are used, choose a low-output lamp outside the enclosure and verify substrate temperature with a digital probe. Sunlight through glass and powerful display lamps can overheat a small enclosure quickly.

🌡 Heating and temperature

Suitable approximate temperatures are:

• Daytime: around 24-28°C
• Night: around 20-24°C

Moderate consistent warmth works better than overheating.

The structured range of 22-27°C is a safe everyday target, with 24-26°C supporting normal activity for many established animals. Do not try to reproduce outdoor daytime peaks inside the burrow. Sustained temperatures near 30°C, especially with poor ventilation or a dry water dish, raise dehydration risk.

If the room is too cool, heat the room first. Where local heating is unavoidable, place a thermostatically controlled low-power source on one side, never beneath the enclosure; a burrowing spider must be able to move downward without approaching the hottest area. Check the temperature at substrate level, not only on a wall above it.

💧 Humidity and water

This species is usually kept with some retained moisture in part of the substrate and constant access to water.

Useful principles:

• Lower layers slightly moist
• Upper layers not swampy
• Water dish present
• Steady airflow

Constant saturation is dangerous, but completely dry substrate is also not ideal.

Pour a measured amount of water down one side or overflow the dish slightly so moisture moves into the lower layers. Allow the surface away from that area to become only lightly moist or dry before watering again. The desired result is a gradient visible through the enclosure wall, not condensation over every surface.

A hygrometer can reveal a broad trend, but it does not replace checking the soil. Persistent condensation, sour odor, spreading mold, phorid flies, or water collecting at the bottom indicate excess water or insufficient airflow. A shrinking darker band in the lower substrate, a dry collapsing tunnel, or a spider repeatedly sitting at the water dish suggests that hydration needs review. Keep the dish full even when the spider webs or fills it with soil; clean and return it rather than substituting occasional spraying.

🌿 Enclosure and decoration

The enclosure should prioritize substrate depth and burrow security.

Useful elements include:

• Deep compact substrate
• Cork bark starter tunnel
• A water bowl
• Minimal stable decor

Height is much less important than a safe underground retreat.

Use a compactable mix such as unfertilized topsoil with coco fiber and a small amount of excavator clay or clean sand. Compress it in layers so a tunnel holds its shape while remaining diggable. Pure loose coco fiber can slump, and wet peat-heavy mixes can become airless. Avoid fertilized potting soil, pesticides, aromatic wood chips, sharp gravel, and substrate collected from contaminated ground.

Anchor cork and any light artificial plant before the spider moves in. Heavy rocks and water bowls must not sit where excavation can undermine them; place the bowl on a stable ledge or the firm surface. Leave only a modest gap above the substrate, because an exposed climbing spider can fall and rupture its abdomen.

Spot-clean accessible prey remains, but do not dismantle an established burrow for routine cleaning. A full substrate change is warranted when contamination, persistent pests, flooding, structural failure, or another concrete problem cannot be corrected locally.

🪳 Feeding

Melopoeus lividus is insectivorous.

Suitable foods include:

• Crickets
• Roaches
• Locusts where available
• Other suitable feeder insects of safe size

Spiderlings usually eat every few days, juveniles once or twice a week, and adults roughly every 7-14 days depending on prey size and body condition.

Prey is often taken from the burrow entrance. Uneaten prey should not be left to disturb a molting spider.

Choose prey no larger than the spider’s abdomen and adjust frequency to body condition rather than trying to force a schedule. Slings can take small roach nymphs, cricket pieces, or appropriately sized live prey every 4-7 days; juveniles commonly feed every 7-10 days. An established adult may accept one substantial prey item every 10-14 days and may fast much longer before a molt.

Place prey at the tunnel mouth after dark and confirm its removal or capture. Do not push insects into the burrow. Burrowing mealworms and roaches can be offered in a smooth-sided dish or lightly crushed so they cannot disappear into the substrate. Remove uneaten live prey within about 24 hours, sooner if the spider is in premolt.

Food refusal alone is not a reason to excavate. A plump abdomen, darkening color, increased webbing, and a sealed tunnel can precede a molt. Wait until the new fangs are fully black before resuming food—several days for a sling and often a week or more for a large adult. Routine vertebrate prey and supplement powders are unnecessary.

🩺 Common problems

Common problems include collapse of poor substrate, dehydration from neglected water access, overly wet stagnant setups, overheating, and escape risk during maintenance.

Warning signs include:

• Constant stress posture near the surface
• Wrinkled abdomen
• Weak movement
• Failed molt
• Visible collapse of the retreat area

This is a fast defensive species, so maintenance should stay controlled and minimal.

Other practical warning signs include mites clustering on the mouthparts, persistent fungus inside the retreat, a tightly curled posture, uncoordinated movement, leaking hemolymph, and an abdomen that remains shriveled despite water access. A tarantula lying on its back is normally molting; do not turn it over or pull at the old exoskeleton.

If a burrow floods, tilt or drain the enclosure from the side farthest from the spider and provide a dry surface refuge; do not probe blindly into the tunnel. For a major collapse, injury, severe dehydration, or failed molt, isolate the immediate hazard and seek advice from an exotics veterinarian or an experienced invertebrate keeper. Avoid improvised chemicals and unnecessary manipulation.

📌 Conclusion

Melopoeus lividus suits an experienced keeper who is content to see webbed tunnel entrances more often than cobalt legs. The enclosure should be fully built, tested for escapes, and serviceable with long tools before the spider arrives. Deep stable substrate and a controlled maintenance routine prevent more problems than frequent intervention.

📚 Sources and further reading

• CITES Appendices, checked 2026-06-03
• EU wildlife trade regulations overview, checked 2026-06-03
• World Spider Catalog: Melopoeus lividus
• The Tarantula Collective: cobalt blue tarantula care
• Tom’s Big Spiders: keeping moisture-dependent tarantulas
• PubMed: two confirmed Haplopelma lividum bite reports