Phormictopus cancerides

🔤 Taxonomy

Phormictopus cancerides is a large Caribbean tarantula. The genus contains several similar species, so precise labels are important in breeding and trade.

English common names used in the hobby:

• Hispaniolan giant tarantula
• Haitian brown tarantula

📌 Description

Phormictopus cancerides is a New World tarantula kept mainly as a display invertebrate. Adult size is usually 7-8 cm body, 18-20 cm legspan, and lifespan is females 10-15+ years; males shorter after maturity. It should not be handled routinely. Even species considered calm can bolt, fall, bite, or flick urticating hairs when stressed. The keeper’s job is to provide a secure enclosure, stable moisture gradient, safe fall height, and enough privacy for normal feeding and molting.

Spiderlings can show a metallic blue cast before maturing into heavier bronze-brown animals, and growth may be rapid under steady warm conditions. Color changes do not alter the handling advice: this is a powerful, quick terrestrial whose feeding response can carry it across the enclosure in an instant.

🌍 Distribution

The current World Spider Catalog gives the unresolved historical aggregate range as “Caribbean to Brazil.” Modern Hispaniola literature securely documents Phormictopus cancerides on Hispaniola, including the Dominican Republic and Haiti, but the broader catalog wording should not be converted into a guessed country list.

The existing range map shows only that securely documented Hispaniola core, not the full unresolved historical aggregate. On the island, the species is associated with warm scrub, forest edge, disturbed ground, and terrestrial retreats.

The enclosure should solve the same basic problems the spider solves in the wild: cover, warmth, water, and seasonal stability.

Distribution is a clue to habitat use, not a demand for unstable enclosure conditions. Focus on retreats, moisture choice, warmth, and reliable security.

🌡 Climate across the native range

Monthly climate normals from reviewed GBIF occurrence locations:

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 sources in April 2026, Phormictopus cancerides is not currently listed in the CITES Appendices, and no species-specific EU wildlife-trade Annex listing was found. It is not relevant to the Bern Convention unless a country applies separate native-wildlife rules. Local rules on ownership, import, sale, transport, breeding, invasive-species control, dangerous-animal licensing, and proof of lawful origin may still apply; keep purchase and breeding records.

🤌 Husbandry

Babies or slings should start in smaller secure enclosures such as small secure cup with moisture gradient and no prey left during premolt. Smaller starter housing makes feeding, molts, hydration, and waste easier to monitor. Adults need the full planned enclosure, stronger locks or lids, and more stable environmental zones. Do not buy a young animal unless the adult housing, food supply, and legal responsibilities are already realistic.

Fast movement and a strong feeding response are normal. Pre-kill or remove prey if the spider is in premolt, open the enclosure only in a controlled area, and keep a catch cup ready before starting maintenance.

Adult enclosures should be low, stable, and escape-proof, with modest open height, reliable ventilation, and no heavy decor that could cause a fall injury.

For spiderlings and juveniles, stability matters more than display. Keep the container small enough to locate prey and check molts, but include cover and a moisture choice so the animal is not forced to sit in the open.

Inspect the enclosure after every molt. Fast growth can turn ventilation holes and lid gaps that were safe for a sling into escape points for a stronger juvenile. Rehouse before the spider becomes cramped, but avoid oversized containers in which prey disappears and hydration is difficult to judge.

House one animal per enclosure. A practical adult enclosure is 35 x 25 x 25 cm minimum; 40 x 30 x 30 cm is better for large females. Larger is useful when it creates more usable movement, better gradients, and safer maintenance. Use secure ventilation and stable furnishings. Keep simple notes on feeding, molts, weight changes, and behaviour, and quarantine new animals before adding them to the collection.

Do maintenance in a closed, uncluttered room with a catch cup and card ready. Use long forceps for food remains and keep hands away from the burrow mouth. Quarantine arrivals with separate tools, watching for mites near the mouthparts and dish before moving the enclosure into the main collection.

💡 Lighting

A clear 10-12 hour day-night cycle is useful. Ordinary room light is enough for tarantulas; UVB and bright basking lamps are unnecessary. Avoid visible night lights and any lamp that dries the enclosure or overheats retreats.

🌡 Heating and temperature

Aim for 24-28 °C, with overheating above 30 °C avoided. Measure with digital probes and use an infrared thermometer for any warmed surfaces. Any supplemental heat should be controlled by a thermostat. Tarantulas are usually safer with warm room temperatures or gentle side heat rather than hot lamps or under-tank pads.

💧 Humidity and water

Humidity target: 65-75% with a moist lower layer, water dish, and good ventilation. Keep fresh water available in a stable dish sized for the animal. Keep moisture useful, not stagnant. Chronic dryness risks dehydration and bad molts; constantly wet substrate brings mold, mites, and poor air quality.

Pour water into one side so the lower layers remain damp while the surface dries. This is more stable than frequent misting. Strong cross-ventilation is essential, but tiny slings can desiccate quickly; check the depth of moisture rather than relying only on a gauge or surface appearance.

🌿 Enclosure and decoration

Provide a warm retreat, cooler retreat, water, safe texture for molting, and enough cover that the animal can move without feeling exposed. Juvenile setups should be simple enough to inspect but not bare. Adult enclosures must be built for strength, stable furniture, secure doors or lids, and safe cleaning access. Limit fall height for heavy terrestrial tarantulas. Use deep substrate, keep open space modest, and make sure lids, ventilation panels, and access points close securely.

🪳 Feeding

Feed roaches, crickets, locusts, and occasional worms; strong feeders can become obese. Let body condition set the feeding pace; eager feeders can still be overfed. Spiderlings eat smaller meals more often; adults usually eat less often and should stay lean rather than swollen. Remove uneaten prey promptly, especially before a molt.

Active slings can take small roaches, crickets, or pre-killed pieces twice weekly. Juveniles often thrive on one appropriately sized prey item every five to seven days, while adults can be fed every 10-14 days according to abdomen size. Stop feeding in premolt and wait for fully black fangs after the molt, usually a week or more for a large adult.

🥚 Breeding

Mature animals can be productive but defensive. Pair under supervision and prepare many secure spiderling cups because escapees are fast. Breeding should use healthy mature animals with known identity and lawful origin. Keep dates, pairings, offspring numbers, and transfer records, and do not produce more young than can be housed and placed responsibly.

🩺 Common problems

Common problems include dehydration, bad molts, overheating, mites, fall injuries, refusal to feed with visible weight loss, and stress from exposure or poor security. Warning signs include a shriveled abdomen, leaking injury, failed molt, swollen joints, twisting posture, sudden lethargy, or repeated frantic escape attempts. Consult an exotic-animal veterinarian for severe weakness, injury, swelling, failed molt, or prolonged refusal to feed with decline in body condition.

Do not flip a spider found on its back; that is the normal molting position. Remove live prey and leave it undisturbed. Urticating hairs can inflame skin and eyes, so wash after work and keep the enclosure below face level. A fresh fall, leaking hemolymph, or marked dehydration calls for immediate, minimal-stress assessment.

📌 Conclusion

Phormictopus cancerides needs adult-sized planning from the start, not only interest in the juvenile stage. Secure housing, measured conditions, appropriate feeding, and basic records make long-term care predictable.

📚 Sources and further reading

• World Spider Catalog species entry
• GBIF species entry for Phormictopus cancerides
• Pérez-Gelabert 2008: Arthropods of Hispaniola
• Tom’s Big Spiders: Phormictopus species husbandry
• Tom’s Big Spiders: Phormictopus cancerides notes
• CITES Checklist and Appendices
• EU wildlife trade regulations