Mojave Dwarf Tarantula (Aphonopelma mojave)
Comprehensive Species Care Guide — The Vivarium Vault
Quick Facts
| Category | Information |
|---|---|
| Scientific name | Aphonopelma mojave |
| Authority | Prentice, 1997 |
| Common name | Mojave Dwarf Tarantula (descriptive, not standardised) |
| Family | Theraphosidae |
| Native distribution | United States, Mojave Desert region |
| Habitat | Arid terrestrial habitats with sheltered ground-level microhabitats |
| Adult size | Small-bodied; individual measurements should guide housing |
| Lifestyle | Terrestrial, retreat-associated |
| Natural activity | Seasonal; precise species-specific pattern requires reference to field records |
| Diet | Small terrestrial invertebrates |
| Female lifespan | Not reliably established for this species |
| Urticating hairs | Defensive hairs typical of the genus |
| Venom | Present |
| Cohabitation | Solitary |
| Recommended keeper experience | Advanced |
| Main husbandry priorities | Secure housing, burrow-supporting substrate, moderate temperatures and accessible water |
Research status: Aphonopelma mojave is an accepted scientific species. Its taxonomy is documented more thoroughly than its captive husbandry. The care recommendations below are informed by terrestrial tarantula biology and should not be mistaken for experimentally established requirements for this species.
1. Species Overview
The Mojave Dwarf Tarantula, Aphonopelma mojave, is a small North American tarantula associated with the Mojave Desert of the south-western United States.
It was described by Thomas R. Prentice in 1997 in a study of the tarantulas occurring in the Mojave Desert west and north of the Colorado River.
The species was subsequently reviewed in the extensive 2016 revision of United States Aphonopelma.
It is an important example of the diversity concealed within a genus often associated with large, robust, slow-growing terrestrial spiders.
Not all Aphonopelma are comparable in adult dimensions, geographic distribution or natural history.
For A. mojave, small size and terrestrial sheltering behaviour are particularly important when planning accommodation.
Although the species inhabits a desert environment, this does not justify keeping it on completely dry substrate under intense heat.
Desert-dwelling spiders can avoid exposed conditions by remaining in protected retreats, and soil temperatures can differ greatly from the temperature of the surface.
A suitable captive setup should therefore offer environmental choice: a protected retreat, stable substrate, access to water and a temperature range that does not force the spider into continuous exposure.
The species is not sufficiently well documented in captivity to support claims of a precise ideal humidity percentage, fixed adult lifespan or proven breeding schedule.
Keepers should approach it as a specialist species requiring accurate identification, documented provenance and careful observation.
2. Taxonomy and Identification
Scientific classification
- Kingdom: Animalia
- Phylum: Arthropoda
- Class: Arachnida
- Order: Araneae
- Infraorder: Mygalomorphae
- Family: Theraphosidae
- Genus: Aphonopelma
- Species: Aphonopelma mojave
Taxonomic history
Prentice formally described A. mojave in 1997.
Hamilton, Hendrixson and Bond retained and reassessed the species in their 2016 revision, using a wider combination of morphological, molecular and geographical evidence.
Identification challenges
Small-bodied Aphonopelma from the south-western United States can be difficult to identify confidently from photographs.
Species requiring comparison include:
- Aphonopelma atomicum
- Aphonopelma icenoglei
- Aphonopelma joshua
- Aphonopelma prenticei
These are separate species, not alternative common names for A. mojave.
Colour and appearance
General body colour, leg colour and abdominal appearance can change with sex, age and moult condition.
Colour alone is not diagnostic.
Scientific identification
Reliable identification may require comparison with the diagnostic characters published in the original description and 2016 revision.
Provenance is valuable supporting evidence but is not necessarily sufficient on its own.
Sex determination
Sexing from a suitable moult may be possible, although small specimens require careful examination.
Mature males develop reproductive structures that distinguish them from immature individuals.
Avoiding misidentification
Do not breed, distribute or relabel unidentified dwarf Aphonopelma as A. mojave solely because they originated somewhere in the Mojave Desert.
3. Natural Distribution and Ecology
Mojave Desert origin
The species is associated with the Mojave Desert region of the south-western United States.
This is distinct from the Sonoran Desert, where some other small Aphonopelma species occur.
Regional environment
The Mojave Desert is characterised by aridity, marked seasonal variation, hot summer conditions and potentially cool winter nights.
These regional features do not directly describe the temperatures experienced inside a spider’s retreat.
Habitat complexity
The Mojave Desert contains several different environments, including:
- Gravelly desert plains.
- Rocky foothills.
- Desert washes.
- Shrubland.
- Protected ground-level microhabitats.
A species’ presence within this region does not establish that it occupies every habitat type.
Shelter and soil
Soil and protected retreats can buffer rapid changes in temperature and moisture.
Captive accommodation should provide the opportunity to establish a sheltered terrestrial refuge.
Burrowing evidence
The precise natural burrow depth, entrance architecture and preferred soil composition of A. mojave should not be presented as established without reference to species-specific field observations.
For captive purposes, compactable substrate is a precautionary provision that allows the spider to excavate if it chooses.
Seasonal activity
Surface activity in desert tarantulas may depend on rainfall, temperature, sex and reproductive condition.
A mature male searching for females may behave very differently from an established female.
Natural diet
The species is a predatory spider and is expected to consume appropriately sized terrestrial invertebrates.
A detailed species-specific wild prey inventory is not available here.
Captive implications
A desert origin is not a reason to eliminate drinking water, expose the spider to strong heat or prevent access to slightly moist substrate.
4. Adult Size, Growth and Lifespan
Adult size
Aphonopelma mojave is a comparatively small tarantula.
A reliable universal adult leg-span figure is not provided because individual size and the distinction between body length and leg span are important.
Body condition
A healthy abdomen should be assessed relative to the carapace, individual development and recent feeding or moulting.
An extremely distended abdomen may increase the consequences of a fall.
Growth rate
No dependable species-specific captive growth schedule is established here.
Female lifespan
A verified maximum female lifespan for A. mojave is unavailable.
Male lifespan
Mature male tarantulas generally have a shorter remaining lifespan than females.
Record keeping
Record moults, feeding, body condition, sex determination and changes in activity.
Do not assign the longevity of a larger Aphonopelma species to this one without evidence.
5. Housing and Enclosure Requirements
The enclosure should be terrestrial, escape-proof, well ventilated and proportionate to the individual spider.
Adult enclosure dimensions
For a small adult, a practical starting point is:
8 × 8 × 8 inches (20 × 20 × 20 cm)
A somewhat larger option is:
12 × 8 × 8 inches (30 × 20 × 20 cm)
These are practical recommendations, not scientifically demonstrated minimum enclosure sizes.
Very small adults may be more easily maintained in smaller accommodation, provided that floor space, substrate depth, ventilation and environmental choice are adequate.
Horizontal space
Prioritise usable floor area over height.
The enclosure should permit movement around the retreat and access to a drinking-water dish.
Substrate depth
Provide approximately:
4–5 inches (10–13 cm)
of compactable substrate for a small adult, adjusting to the enclosure and spider.
Retreat provision
A secure cork bark shelter or a shallow starter burrow provides an accessible protected area.
Fall prevention
Fill much of the vertical space with substrate, leaving limited unobstructed height.
A terrestrial tarantula can sustain severe abdominal injury if it falls from an elevated surface.
Security
Check all gaps around lids, doors and ventilation.
A small spider can pass through openings that would not be a concern for a larger species.
Ventilation
Use multiple secure openings to encourage air exchange.
Ventilation must not create escape routes.
Enclosure materials
Glass, acrylic or suitable plastic can all be used.
The quality of the enclosure design matters more than the material alone.
Furnishing safety
Heavy stones and other hard objects must be supported so that excavation cannot undermine them.
Spiderling accommodation
Spiderlings require smaller, escape-proof containers with:
- Proportionate substrate depth.
- A small sheltered area.
- Suitable fine ventilation.
- A carefully maintained moisture source.
- Appropriately sized prey.
Small containers may dry out or overheat more quickly than adult enclosures.
Juvenile accommodation
Increase enclosure size progressively as the spider develops.
Avoid transferring a very small juvenile into a large enclosure that makes monitoring and prey removal difficult.
Subadult accommodation
Provide additional floor area and deeper substrate as appropriate.
Cohabitation
House every specimen separately.
6. Substrate and Burrowing
Purpose of substrate
Substrate should permit digging, support retreat construction and create a buffered ground-level environment.
Suitable materials
Possible components include:
- Reptile-safe topsoil.
- Suitable commercial terrestrial tarantula substrate.
- A soil and coco coir mixture.
- Clean, compactable soil-based blends.
Compaction
Lightly compact the substrate when setting up the enclosure.
An excessively loose mixture may collapse around excavations.
Moisture gradient
Maintain one lower section slightly moist while allowing substantial surface areas to remain relatively dry.
Avoid permanent saturation
Wet, stagnant substrate can encourage mould and unsuitable conditions.
Starter burrow
Create a small excavation beneath a secure piece of cork bark.
The spider should be free to enlarge, ignore or modify it.
Burrow maintenance
Avoid destroying an established retreat during routine cleaning.
Unsuitable substrate
Avoid fertilised compost, pesticide-treated soil, sharp gravel and aromatic wood shavings.
7. Furnishings and Environmental Enrichment
The aim is to support natural sheltering and exploration without introducing unnecessary risk.
Useful furnishings
- Cork bark.
- Low, stable hides.
- Small amounts of leaf litter.
- A suitable drinking-water dish.
- Secure low stones where appropriate.
Environmental choice
Provide sheltered and more exposed areas.
Retreat stability
Do not place heavy decorations loosely on deep substrate.
Behavioural opportunities
Allow excavation, silk placement and modification of the retreat.
Avoid excessive climbing height
Tall branches and elevated platforms are not necessary.
8. Temperature and Heating
The thermal preferences of A. mojave have not been established through controlled captive studies.
Provisional temperature starting points
| Area or period | Suggested temperature |
|---|---|
| General daytime | 21–25°C |
| Slightly warmer area | Up to approximately 26°C |
| Cooler retreat | Approximately 20–22°C |
| Night-time | Approximately 18–21°C |
These are conservative captive recommendations rather than proven species-specific limits.
Why desert temperatures are misleading
Exposed Mojave Desert ground can become extremely hot.
An animal occupying a protected retreat does not necessarily experience those conditions.
Heating in Ireland
An adequately heated room may require little or no additional enclosure heating.
Colder rooms may require supplementary heating.
Heating method
Where heating is necessary, use controlled external heating that does not eliminate the spider’s ability to retreat into cooler areas.
Avoid heating beneath the substrate
Direct heating under the burrow can remove a potential cool refuge.
Thermostats
Use a suitable thermostat with supplementary heating.
Monitoring
Measure temperatures within the enclosure rather than relying solely on the room thermostat.
Seasonal cooling
Do not deliberately expose the spider to severe winter temperatures in an attempt to reproduce the desert climate.
9. Lighting and UVB
Lighting requirements
A regular light-dark cycle is appropriate.
UVB
There is no established requirement for dedicated UVB lighting in this species.
Ambient light
Normal indirect room light is generally sufficient.
Display lighting
Low-output lighting may be used if it does not cause overheating.
Avoid
Do not use high-intensity basking lamps or expose the enclosure to direct sunlight.
Night-time
Provide a period of darkness.
10. Humidity, Hydration and Ventilation
Humidity targets
A validated species-specific relative humidity target is not available.
Maintaining an exact number on a hygrometer should not replace assessment of substrate condition, ventilation and water availability.
Drinking water
Provide a clean, stable, appropriately sized drinking-water dish.
Moisture gradient
A slightly moist section of lower substrate can offer an alternative microclimate.
Surface conditions
Much of the surface may remain relatively dry.
Ventilation
Maintain effective air exchange to reduce stagnant conditions.
Spiderlings
Very small enclosures require close attention to moisture because they may dry rapidly.
Misting
Heavy routine misting is not necessary.
Signs of unsuitable moisture
Persistent condensation, mould, saturated substrate or a stagnant smell indicate that the setup should be reviewed.
Observation
Monitor retreat choice, moulting, feeding and general activity.
11. Feeding and Nutrition
Natural feeding behaviour
Aphonopelma mojave is a predatory spider.
Suitable captive prey
- Small crickets.
- Appropriately sized feeder cockroaches.
- Small mealworms.
- Other suitable captive-bred feeder insects.
Spiderlings
Use tiny live prey or suitable portions of freshly killed feeder insects.
Juveniles
Feeding approximately once a week may be a useful starting point.
Adults
Offering suitable prey approximately every 7–14 days is a reasonable initial approach.
These intervals are not species-specific scientific findings.
Feeding adjustments
Assess abdominal condition, appetite, recent moults and activity.
Prey size
Avoid prey that is excessively large or capable of injuring the spider.
Feeding near a retreat
Place prey where the spider can detect it without requiring repeated disturbance.
Uneaten prey
Remove uneaten insects promptly, particularly during premoult.
Wild-caught prey
Avoid insects collected outdoors because of pesticide and parasite risks.
Vertebrate prey
Vertebrate feeding is unnecessary.
12. Calcium and Vitamin Supplementation
Routine reptile-style calcium and vitamin dusting is not required.
Tarantulas consume whole prey.
Maintain feeder insects in appropriate conditions.
There is no validated calcium or vitamin supplementation schedule for A. mojave.
13. Moulting and Growth
What moulting involves
The spider sheds its exoskeleton to grow and renew external structures.
Possible premoult signs
- Reduced feeding.
- Increased concealment.
- Retreat closure.
- Reduced movement.
- Changes in abdominal appearance.
During a moult
Do not disturb the spider.
A tarantula lying on its back may be moulting normally.
Do not turn it over.
After moulting
Allow the new exoskeleton and fangs to harden before feeding.
Small specimens
It may be difficult to assess fang hardening in very small individuals.
Do not rush to resume feeding.
Problems
Incomplete moulting, injury or prolonged inability to recover warrants specialist advice.
Do not forcibly pull away retained exoskeleton.
14. Urticating Hairs and Defensive Behaviour
Defensive hairs
New World Aphonopelma possess urticating hairs used in defence.
Possible responses to disturbance
- Retreating.
- Flicking or releasing defensive hairs.
- Raising the front legs.
- Biting if threatened.
Effects of hairs
Contact may cause itching, skin irritation or eye irritation.
Eye exposure
Do not rub the eye.
Seek prompt medical assessment.
Behavioural variation
An individual that is normally calm may behave defensively during maintenance or after disturbance.
Prevention
Use tools and avoid unnecessary handling.
15. Venom and Bite Safety
Venom
The species has venom-bearing fangs.
Possible bite effects
A bite may cause puncture wounds, pain, redness and swelling.
The clinical effects of A. mojave venom have not been adequately characterised in humans.
First aid
Wash the wound with clean running water.
Seek medical advice where appropriate.
Emergency symptoms
Breathing difficulty, collapse or signs of a severe allergic reaction require urgent medical attention.
Handling policy
Do not rely on assumptions that a New World tarantula bite is harmless.
16. Handling and Safe Rehousing
Routine handling is not recommended.
Risks
- Escape.
- Falls.
- Injury.
- Bites.
- Urticating-hair exposure.
Preparing for a transfer
Have the receiving enclosure ready before opening the existing one.
Equipment
Use a suitable catch cup, soft brush and secure temporary container.
Transfer procedure
Guide the spider gently into a container rather than lifting it by hand.
Burrowed specimens
Avoid digging out an established spider unless necessary for welfare or essential enclosure maintenance.
Working area
Close doors and windows and eliminate accessible gaps where possible.
Final checks
Ensure the spider is accounted for and all openings are secure.
17. Cohabitation
Aphonopelma mojave should be housed individually.
Risks of cohabitation
- Cannibalism.
- Injury.
- Competition for retreats.
- Feeding interference.
- Unnecessary disturbance.
Temporary supervised breeding introductions are not evidence that permanent communal housing is safe.
18. Cleaning and Routine Maintenance
Daily or regular checks
Check water availability, temperature and enclosure security.
After feeding
Remove uneaten prey.
Weekly
Clean the water dish and remove visible waste.
Periodic checks
Inspect ventilation, substrate condition and furnishings.
Mould
Investigate persistent mould and excessive moisture.
Full substrate changes
Replace substrate when contamination or deterioration makes it necessary.
Routine complete replacement may unnecessarily destroy an established retreat.
Record keeping
Record environmental conditions, moults and changes in feeding behaviour.
19. Common Health Concerns
Dehydration
Ensure accessible water and a suitable moisture gradient.
Falls
Terrestrial tarantulas may suffer serious abdominal injuries from falls.
Moulting complications
Retained exoskeleton or failed moults may be serious.
Mites
Some tiny substrate organisms are harmless decomposers, but persistent mites concentrated on the spider require investigation.
Mould
Persistent mould may indicate excess moisture, decaying food or inadequate ventilation.
Feeding refusal
Consider premoult, body condition and environmental conditions.
Abnormal posture
Marked leg curling, weakness or inability to move normally warrants urgent assessment.
Veterinary care
Seek assistance from a veterinarian experienced with exotic animals and invertebrates.
20. Quarantine and New Acquisitions
New specimens should be kept separately from established collections.
Precautionary period
An observation period of approximately 60–90 days may be used as a practical quarantine approach.
This is not a scientifically validated guarantee against disease.
Monitor
- Feeding.
- Moulting.
- Body condition.
- Visible parasites.
- Abnormal behaviour.
- Substrate condition.
Equipment hygiene
Use separate tools where practical.
Provenance
Retain identification and acquisition information.
21. Breeding and Reproduction
Breeding A. mojave requires accurate identification and specialist experience.
Confirming identity
Both animals should be reliably identified before pairing.
Sex determination
Use suitable moults or recognised adult morphological characters.
Mature males
Mature males may leave established retreats and search for females.
Seasonality
A precise captive breeding calendar is not established here.
Pairing
Supervise introductions carefully.
Cannibalism
Females may attack males.
Egg-sac production
Successful mating may lead to egg-sac production, but species-specific incubation conditions are insufficiently documented.
Spiderling care
Provide individually secure containers, suitable moisture and tiny prey.
Breeding records
Document parentage, dates, moults, pairings and offspring development.
Avoid hybridisation
Do not pair A. mojave with other dwarf Aphonopelma species.
22. Conservation and Responsible Captive Breeding
Conservation considerations
Desert tarantulas may be affected by habitat disturbance and collection.
Population assessment
Do not assign an IUCN conservation category without a verified assessment.
Habitat conservation
Protection of natural habitat remains important regardless of captive breeding activity.
Captive-bred sourcing
Prefer legally sourced captive-bred specimens with documented identity.
Wild collection
Collection laws vary according to land ownership, protected areas and applicable regulations.
Provenance
Retain accurate breeding and locality records.
Release
Never release captive tarantulas into the wild.
23. Legal and CITES Considerations
CITES
Check the current CITES Checklist for the species before international trade.
Do not assume that the legal status of one tarantula genus applies to another.
United States
Wildlife collection, possession and export may be subject to federal, state and local rules.
European Union
Check relevant import, customs and wildlife trade requirements.
Ireland
Consult the National Parks and Wildlife Service and other relevant authorities where clarification is necessary.
Documentation
Retain:
- Scientific name.
- Supplier details.
- Acquisition date.
- Evidence of lawful origin.
- Captive-breeding records.
- Any applicable permits or certificates.
Legal distinction
A species not listed under CITES may still be subject to other legal restrictions.
24. Common Husbandry Mistakes
- Confusing the Mojave Desert with the Sonoran Desert.
- Using unverified trade names as scientific identification.
- Providing an enclosure with escape-sized gaps.
- Offering insufficient substrate for a terrestrial retreat.
- Keeping substrate permanently wet.
- Providing no drinking water because the species comes from a desert.
- Using intense basking lamps.
- Heating directly beneath a burrow.
- Providing excessive fall height.
- Offering prey too large for the spider.
- Leaving live prey during moulting.
- Repeatedly excavating the retreat to check on the spider.
- Handling unnecessarily.
- Attempting communal housing.
- Breeding unidentified dwarf tarantulas together.
25. Husbandry Summary
| Requirement | Practical starting recommendation |
|---|---|
| Scientific name | Aphonopelma mojave |
| Native region | Mojave Desert, United States |
| Lifestyle | Small terrestrial tarantula |
| Adult enclosure | Approximately 8 × 8 × 8 inches |
| Larger option | Approximately 12 × 8 × 8 inches |
| Substrate depth | Approximately 4–5 inches |
| Daytime temperature | Approximately 21–25°C |
| Night-time temperature | Approximately 18–21°C |
| Humidity | No validated fixed percentage |
| Moisture | Slightly moist lower area; drier surface |
| Ventilation | Secure and effective |
| Drinking water | Always accessible |
| Lighting | Normal light-dark cycle |
| Dedicated UVB | Not routinely required |
| Feeding | Appropriately sized captive-bred insects |
| Handling | Not recommended |
| Cohabitation | Solitary |
| Experience | Advanced |
| Breeding | Specialist; identification essential |
| Legal status | Check current requirements |
The values in this table are provisional captive-care starting points, not proven species-specific physiological limits.
26. References and Further Reading
- Prentice, T. R. (1997). Theraphosidae of the Mojave Desert west and north of the Colorado River (Araneae, Mygalomorphae, Theraphosidae). Journal of Arachnology, 25(2), 137–176.
- Hamilton, C. A., Hendrixson, B. E. & Bond, J. E. (2016). Taxonomic revision of the tarantula genus Aphonopelma within the United States. ZooKeys, 560, 1–340. Taxonomic revision of the tarantula genus Aphonopelma Pocock, 1901 (Araneae, Mygalomorphae, Theraphosidae) within the United States
- World Spider Catalog (2026). Aphonopelma mojave Prentice, 1997. Natural History Museum Bern. World Spider Catalog
- Integrated Taxonomic Information System. Aphonopelma mojave, TSN 851113. https://www.itis.gov
- Foelix, R. F. Biology of Spiders. General reference on spider anatomy and physiology.
- CITES. Checklist of CITES Species. https://checklist.cites.org
- National Parks and Wildlife Service, Ireland. https://www.npws.ie
Evidence and Research Limitations
The scientific identity and original authorship of Aphonopelma mojave are supported by published taxonomic literature.
Its association with the Mojave Desert is also documented.
However, species-specific captive temperature preferences, humidity requirements, enclosure dimensions, growth rates, longevity and breeding protocols are not adequately established by controlled studies.
The recommendations in this guide are conservative starting points based on the needs of small terrestrial tarantulas. They should be refined as reliable species-specific observations become available.
IMPORTANT INFORMATION
This care sheet provides general husbandry guidance and does not replace species-specific research or veterinary advice. Individual requirements may vary.
Always check current legislation governing the acquisition, collection, import, transport, keeping, breeding or sale of reptiles and invertebrates in your jurisdiction.
If you have concerns about an animal’s health or care, consult a suitably experienced exotic or invertebrate veterinarian.
Information correct at the date of publication, subject to subsequent changes in scientific knowledge and legislation.
ReptileCommunity.com | Revised: October 2026