Grammostola iheringi
Entre Ríos Tarantula - complete care guide
Often searched as: Grammastolia iheringi, Gramastola iheringi.
Entre Ríos Tarantula
Temperature
22-26 °C
Target ambient range
Humidity
65-75 %
Substrate / enclosure RH
Adult DLS
16-20 cm
Average - varies per individual
Moult interval
Sling 3-6w - Juv 2-3mo
Adult 18-24mo
Adult cycle = mature females; males never moult again after maturity
About
Larger and redder than G. pulchra. Slow grower, defensive of burrows when disturbed.
Husbandry cheat sheet
- Origin
- Argentina & southern Brazil
- Habitat
- Grassland
- Temperament
- Docile
- In your collection
- 0
Growth, lifespan & conservation
- Growth rate
- Slow
- Maturity
- ♀ 60mo ♂ 48mo
- Lifespan
- ♀ 25yr ♂ 4yr
- Continent
- South America
- UK availability
- Commonly available
Care Guide
Grammostola iheringi
Entre Ríos Tarantula - a complete husbandry sheet. Use as a starting point and adjust to your individual specimen.
What size enclosure does an Entre Ríos Tarantula need?
Adults
45 × 30 cm (18 × 12 in) for a mature adult. This is a giant species. Floor space matters more than height.
Slings & Juveniles
House spiderlings in small, appropriately sized deli cups or sling enclosures - oversized enclosures make prey capture difficult. Upgrade roughly every 2-3 moults.
To map exact floor space and substrate safety limits for your setup, use our free interactive tarantula enclosure planner.
What temperature and humidity does an Entre Ríos Tarantula need?
Heating
Entre Ríos This tarantula is comfortable at 22-26 °C. Most UK homes sit in or near this range for most of the year; heat the room rather than the enclosure if winter drops below it.
Humidity
Grammostola are pampean/chaparral species and famously drought-proof: dry substrate (50-60 %), a water dish, done. Entre Ríos Tarantula in particular will tolerate a neglected water dish far better than a wet enclosure.
Ventilation
Cross-ventilation is essential - side-vented enclosures, never stagnant. Poor airflow plus humidity kills faster than dryness ever will.
What substrate is best for an Entre Ríos Tarantula?
Recommended Mixes
Depth
7-11 cm
Notes
Keep substrate dry to barely moist - never soaking. Pack it firm enough to support décor.
How do you set up an Entre Ríos Tarantula enclosure?
Décor
The Hide
A cork bark half-log, leaning slab, or cork tube placed on the substrate.
Water
Always provide a shallow fresh water dish. Keep it full and clean it regularly. No sponges.
Lighting
No special lighting needed. Ambient room light is enough; avoid heat lamps and bright spotlights.
How often should you feed an Entre Ríos Tarantula?
Good Feeders
Long refusal worrying you? Separate premoult fasting from genuine problems with our "Is my T okay?" checker.
Is my Entre Ríos Tarantula dying or moulting?
Pre-moult signs to look for
Refusing food for weeks is normal before a moult - an healthy Entre Ríos Tarantula fasting is almost never an emergency in itself. Watch for slowing down and spending more time in the hide, laying a thick moult mat of web on the floor. New World species like this one often show a bald spot on the abdomen that darkens to near-black as the new skin underneath readies - a darkening bald patch is a reliable countdown, not a disease.
On its back is MOULTING, not dying
An Entre Ríos Tarantula lying upside down or on its side with legs curled inwards is almost certainly mid-moult. Do not touch it, do not right it, do not mist it - just remove any live prey (crickets can kill a defenceless moulter) and leave the room.
How long between moults?
For this species, expect a moult roughly every 21-42 days for spiderlings, every 60-90 days for juveniles, and every 327-463 days for sub-adults, with adult females moulting around every 18.2 months (up to 23.6 months at the extreme). Males never moult again after their ultimate (mature) moult.
After the moult: fang hardening time
The new exoskeleton stays soft, with fangs that cannot grip, for roughly 10 days in this species. Offer no food and no handling for about 10 days - feeding too early is how fresh moulters get injured. The shed exuvium is also the best sexing tool there is - see our tarantula sexing guide for what to look for.
Genuinely worried about behaviour that is not moulting? Our "Is my T okay?" triage tool walks the danger signs one by one.
What ongoing care does an Entre Ríos Tarantula need?
🪞 Moulting
Signs: refuses food, abdomen darkens and goes glossy, becomes sluggish, often heavy webbing or a moult mat. During the moult: do not disturb, remove any live prey, keep water available. Wait until the fangs are black and hard (several days for adults, 1-2 for slings) before feeding again. Adult intervals apply to mature FEMALES - a mature male never moults again (his ultimate moult is his last), and female cycles stretch or shrink with feeding and temperature.
🧹 Cleaning
Daily: check the water dish. Weekly: remove uneaten prey boluses and spot-clean. Full deep clean only every few months, and only when necessary.
✋ Handling
One of the calmest genera in the hobby - the classic 'beginner tarantula' temperament. Still handle at floor level and expect hair-flicking when annoyed, plus legendary random fasting spells that worry new keepers.
What are the most common mistakes when keeping Entre Ríos Tarantulas?
✓ What They Love
- Fresh water dish at all times
- Cross-ventilation
- Stable room temperature
- A proper hide and a few anchor points
✕ Common Mistakes
- Soaking-wet substrate
- Daily misting
- Heat mat underneath the enclosure
- Tall enclosures with hard décor (fall risk for terrestrials)
- Panicking over fasting - Grammostola adults can refuse food for months while staying perfectly healthy
Keep exploring: related care guides
More ground-dwelling species and close relatives from our full library:
⭐ Community Ratings
No ratings yet - be the first to rate this species!