Magnacrus tongmianensis
Thunder Thighs Earth Tiger - complete care guide
Thunder Thighs Earth Tiger
Temperature
15-24 °C
Target ambient range
Humidity
65-80 %
Substrate / enclosure RH
Adult DLS
15-17 cm
Average - varies per individual
Moult interval
Sling 4-7w - Juv 2-3.3mo
Adult 10-15mo
Adult cycle = mature females; males never moult again after maturity
About
The Thunder Thighs Earth Tiger (Magnacrus tongmianensis) - type species of a brand-new genus erected in 2025 (ex-Citharognathus), named for its conspicuously powerful hind legs, with the male only described that same year. A cool-tolerant (15-24 °C!) Chinese/Vietnamese fossorial that is perfectly adapted to unheated British rooms - one of the very few Asian earth tigers you can keep beside a window. Defensive, deep-burrowing, genuinely rare at £18 a sling for something this taxonomically interesting.
Husbandry cheat sheet
- Origin
- China / Vietnam
- Habitat
- Subtropical forest burrows
- Temperament
- Defensive
- In your collection
- 0
Growth, lifespan & conservation
- Growth rate
- Medium
- Maturity
- ♀ 36mo ♂ 24mo
- Lifespan
- ♀ 14yr ♂ 4yr
- Continent
- Asia
- UK availability
- Rare in the hobby
Care Guide
Magnacrus tongmianensis
Thunder Thighs Earth Tiger - a complete husbandry sheet. Use as a starting point and adjust to your individual specimen.
What size enclosure does a Thunder Thighs Earth Tiger Tarantula need?
Adults
30 × 25 cm footprint with 15 cm of substrate.
Slings & Juveniles
Small tubs with 10 cm of substrate and a starter hole.
To map exact floor space and substrate safety limits for your setup, use our free interactive tarantula enclosure planner.
What temperature and humidity does a Thunder Thighs Earth Tiger Tarantula need?
Heating
The Thunder Thighs Earth Tigers is comfortable at 15-24 °C - among the coolest-kept Asian fossorials; UK room temperature usually suffices and supplementary heat is a mistake.
Humidity
65-80 %: keep the lower substrate slightly damp with strong cross-flow and a drier surface.
Ventilation
Cross-ventilation with moderate humidity.
What substrate is best for a Thunder Thighs Earth Tiger Tarantula?
Recommended Mixes
Depth
15 cm
Notes
Deep and packed, holding burrows. Moisture gradient - faint damp below, dry above.
How do you set up a Thunder Thighs Earth Tiger Tarantula enclosure?
Décor
The Hide
Its own deep burrow with a web collar - 15 cm of packed substrate and a starter hole.
Water
Shallow dish at surface level - keep full and clean.
Lighting
Ambient room light only.
How often should you feed a Thunder Thighs Earth Tiger Tarantula?
Good Feeders
Long refusal worrying you? Separate premoult fasting from genuine problems with our "Is my T okay?" checker.
Is my Thunder Thighs Earth Tiger Tarantula dying or moulting?
Pre-moult signs to look for
Refusing food for weeks is normal before a moult - a healthy Thunder Thighs Earth Tiger Tarantula fasting is almost never an emergency in itself. Watch for slowing down and spending more time in the hide, sealing the burrow entrance with silk (a sealed door usually means "do not disturb - moulting in progress"), laying a thick moult mat of web on the floor. Old World species do not flick urticating hairs, so there is no bald patch to watch - rely on fasting, lethargy and hide time instead.
On its back is MOULTING, not dying
A Thunder Thighs Earth Tiger 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 25-50 days for spiderlings, every 60-100 days for juveniles, and every 140-220 days for sub-adults, with adult females moulting around every 10 months (up to 14.7 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 8 days in this species. Offer no food and no handling for about 8 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 a Thunder Thighs Earth Tiger Tarantula need?
🪞 Moulting
Moults at the burrow bottom behind a plug. Do not excavate. Keep humidity steady and prey out; wait until it reopens and the fangs are black before feeding. Adult intervals apply to mature females - males never moult after their ultimate moult.
🧹 Cleaning
Weekly: refresh the water dish and clear boluses with tongs. Full cleans need a rehouse plan.
✋ Handling
Never - defensive and fast. Catch cup and lid discipline.
What are the most common mistakes when keeping Thunder Thighs Earth Tiger Tarantulas?
✓ What They Love
- COOL keeping - subtropical stock, 15-24 °C
- Deep substrate for burrows
- Moderate humidity with airflow
- Long tongs and lid discipline
- Respect: defensive, potent venom
✕ Common Mistakes
- Heating - a genuinely cool-tolerant species
- Free handling
- Shallow substrate
- Stagnant wet air
Keep exploring: related care guides
More deep-burrowing species and close relatives from our full library:
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