Phormictopus spp.
Identity confidence: provisional. This is a genus, group, or trade name rather than a confirmed species. Treat it as the closest match we can stand behind, and use the more conservative end of any range.
Caribbean Bronze & Brown Tarantulas: Advanced Care Guide
Keeper Snapshot: The fast-growing Caribbean giants: the most high-strung of the New World 'big' terrestrials: more skittish and defensive than a Pamphobeteus, with a hair-trigger feeding response and a real willingness to bite. Slings rocket up even faster than Pamphobeteus. Adults reach about 7-8 inches across.
Group: Industry StaplesDifficulty: Spice 3: IntermediateSetup: Large terrestrial / opportunistic burrowerHandling: Not recommended
Use This Guide Safely
- Confirm the exact animal. Match this guide to the species, locality, size, and life stage on your label. If the ID is uncertain, use the more conservative part of the range and ask before changing the setup.
- Change one thing at a time. Treat temperature and humidity as target zones, then watch posture, burrowing, drinking, feeding, and molt behavior before making another adjustment.
- Respect the handling boundary. If the guide says no handling, fast, defensive, or medically significant, plan transfers with catch cups, locked lids, and no bare hands. For serious bites, stings, or symptoms, seek emergency medical care.
Quick Snapshot
| Temperature | 72-82°F |
|---|---|
| Humidity | Moderate ambient (55-70%) with cross ventilation; moist for slings, drier with a humid corner as adults |
| Setup Type | Large terrestrial / opportunistic burrower |
| Substrate | Soil/coco mix, 4-6 in; moist for slings, drier with a damp corner for adults |
| Feeding | Hair-trigger feeder: slings 2-3×/week, adults every 1-2 weeks |
| Care Difficulty | Spice 3: Intermediate |
| Handling | Not recommended |
Humidity zones: Very Low under 30% - Low 30-60% - Low-Moderate 40-70% - Moderate 60-80% - Moderate-High 70-85% - High 80%+ - Very High 90%+
Enclosure Format / Size Class
- Compact secure enclosure while it's a tiny sling
- Moist horizontal terrestrial burrow setup for juveniles
- Large floor-space terrestrial build for the adult (drier, with a humid corner)
Warnings First
- The most high-strung of the New World giants: skittish, defensive, willing biters
- Slings grow extremely fast; rehouse on schedule
- Heavy-bodied. Keep the enclosure low and don't let it get obese
- Slings are kept moist and grow fast, so the sling enclosure is small, damp and short-lived. Build low cross vents into it anyway, and keep grit in the water dish.
Simple Care
- Moist substrate for slings and juveniles; drier with a humid corner for adults; water dish throughout, with pebbles in it so slings cannot drown.
- Cross ventilation low on two opposite walls at every stage; the damp sling phase is when it matters most.
- Substrate deep enough for an opportunistic burrow.
- Tool-based maintenance only: this one bites.
Advanced Keeper Notes
Enclosure & Microclimate
- The hobby names: P. cancerides (Haitian brown), P. auratus (Cuban bronze), P. atrichromatus, and the locality forms P. sp. 'Dominican Purple' and P. sp. 'Green Femur'. Native to varied humid scrubland on Hispaniola, Cuba and in Brazil.
- Adults want a low, wide enclosure with substrate deep enough for an opportunistic burrow: moist for slings, dry-leaning with one humid corner once grown.
- That moisture schedule shifts as the spider grows, but the ventilation requirement does not. Put vents low on two opposite walls, at or just above the substrate, from the sling enclosure onward. The damp sling phase is the risky one: a small enclosure kept moist has almost no air volume to buffer it, and because these grow so fast keepers often leave them in a cup a little too long.
- Ventilation and ambient humidity trade against each other, and here the balance moves with the animal. Slings get moist substrate under strong airflow; adults get drier substrate with one humid corner under the same airflow. The airflow is the constant.
- Judge by hand rather than by gauge. For slings the substrate should be moist with no free water and still dry back noticeably between top-ups. For adults, the open floor reads dry while the humid corner stays damp.
- Keep a dish at every stage and put pebbles or coarse grit in it so the waterline sits below the rim. Fast growth means frequent rehousing into bigger enclosures with bigger dishes, and a spider that is large for its age is still small enough to drown.
- Wet the humid corner or under the hide rather than misting the whole enclosure. One damp microclimate a high-strung spider can retreat into is worth more than a damp surface, and it leaves the rest free to dry and re-air.
Feeding, Growth & Maintenance
- Explosive feeding response: slings 2-3×/week, adults every week or two.
- More defensive than Pamphobeteus and notorious for eating males during pairings; willing biters in general. Never work hands-in.
- Molting: a premolt tarantula turns sluggish, seals up its burrow, and refuses food for days or even weeks. Pull any uneaten feeders, leave it strictly alone, and wait 5-10 days after the molt (until the new fangs and exoskeleton harden) before feeding again.
Possible Origin / Range
- Likely native range: Caribbean (Hispaniola (Haiti, Dominican Republic) and Cuba) plus Brazil; varied humid scrubland.
- Habitat translation: Large terrestrial enclosure with substrate deep enough for an opportunistic burrow (moist for young animals, dry-leaning with a humid corner for adults), and a permanent water dish.
Advanced Keeper Details
- Adult size ~7-8 in DLS; fast growth: even faster than Pamphobeteus as slings; females ~10-15 years.
- Temperamentally the edgiest of the NW giants: high-strung, fast for its bulk, and quick to bite; the husbandry is easy, the handling is not.
- Slings are unforgiving of being left too long in a small cup; size up promptly.