Catalina Mountain Tarantula (Aphonopelma catalina)
Comprehensive Care Guide – The Vivarium Vault
Quick Facts
| Category | Information |
|---|---|
| Scientific name | Aphonopelma catalina |
| Scientific authority | Hamilton, Hendrixson & Bond, 2016 |
| Common name | Catalina Mountain Tarantula |
| Family | Theraphosidae |
| Native distribution | Santa Catalina Mountains, Arizona, USA |
| Natural environment | Mountain-associated terrestrial habitats |
| Species group | Marxi species group |
| Adult size | Small to medium-sized; reliable universal leg-span figures unavailable |
| Lifestyle | Terrestrial, retreat-dwelling and capable of burrowing |
| Activity | Primarily during low-light periods |
| Growth rate | Likely relatively slow |
| Female lifespan | Not reliably established |
| Diet | Carnivorous |
| Urticating hairs | Present |
| Venom | Present |
| Cohabitation | Solitary |
| Experience level | Intermediate to advanced |
| CITES | Verify current species-specific status |
| Main husbandry priority | Stable terrestrial housing, suitable substrate, shelter and avoidance of excessive heat |
Important: This species has limited published captive husbandry information. Recommendations in this guide are conservative starting points informed by its natural history and general Aphonopelma biology, not experimentally validated requirements.
1. Species Overview
The Catalina Mountain Tarantula (Aphonopelma catalina) is a North American terrestrial tarantula associated with the Santa Catalina Mountains of south-eastern Arizona.
It was formally described during the major 2016 revision of United States Aphonopelma.
The species belongs to the Marxi species group, which includes several tarantulas associated with the isolated mountain systems of the American Southwest.
These mountain systems are often referred to as the Madrean Sky Islands.
Unlike some widely distributed North American tarantulas, A. catalina is associated with a geographically restricted mountain region.
Its ecology should not be assumed to match that of lowland desert species.
The Santa Catalina Mountains contain substantial changes in temperature, vegetation and moisture with increasing elevation.
This variation is particularly relevant when considering captive environmental conditions.
Although the species is terrestrial, it should be provided with suitable substrate for digging and access to protected retreats.
Its limited documentation in captivity makes careful observation especially important.
Routine handling is not recommended.
2. Taxonomy and Identification
The accepted scientific name is Aphonopelma catalina Hamilton, Hendrixson & Bond, 2016.
Family
Theraphosidae.
Genus
Aphonopelma.
Species group
Marxi species group.
Scientific description
The species was recognised during the 2016 taxonomic revision of United States Aphonopelma.
That study combined morphological, molecular and geographical evidence.
Appearance
Members of the Marxi group commonly display dark overall coloration.
However, appearance alone is not sufficient for reliable identification.
Similar species
Related Arizona species include:
- Aphonopelma vorhiesi
- Aphonopelma peloncillo
- Other members of the Marxi species group
Identification difficulties
Closely related species may share similar external features.
Reliable identification may require examination of diagnostic anatomy and provenance.
Sex determination
Examination of a suitable moult is generally preferred.
Breeding precaution
Do not pair animals of uncertain identity.
Provenance
Accurate origin records are particularly important for geographically restricted species.
3. Natural Distribution and Ecology
Aphonopelma catalina is associated with the Santa Catalina Mountains of Arizona.
The Madrean Sky Islands
The Sky Islands are mountain ranges separated by lower-elevation desert and grassland environments.
These geographical divisions can contribute to the isolation and diversification of terrestrial organisms.
Mountain habitats
The Santa Catalina Mountains contain several vegetation and climatic zones.
Conditions change substantially with elevation.
Temperature
Mountain habitats may experience cooler conditions than surrounding lowland deserts.
Seasonal rainfall
The region experiences seasonal precipitation, including summer monsoon rainfall.
However, exact species-specific responses to rainfall have not been adequately established for captive care.
Retreat ecology
Protected ground-level retreats can provide shelter from environmental extremes.
Burrowing
Providing opportunities for excavation is appropriate for a terrestrial Aphonopelma.
Natural activity
Surface activity may be influenced by temperature, moisture, reproductive condition and time of day.
Captive implications
Avoid assuming that desert-associated geography means the species should be kept permanently hot and dry.
Provide a moderate environment with sheltered microclimates.
4. Adult Size, Growth and Lifespan
Adult size
The species is relatively small compared with some of the largest New World tarantulas.
A reliable universal adult diagonal leg-span figure is not established here.
Enclosure dimensions should therefore be adjusted to the actual specimen.
Growth rate
Relatively slow growth is expected based on the biology of related Aphonopelma.
Female lifespan
A reliable species-specific maximum lifespan has not been established.
Male lifespan
Mature males generally have shorter remaining lifespans than females.
Individual variation
Growth depends on sex, temperature, feeding and other biological factors.
Long-term records
Record moults, feeding, growth and changes in behaviour.
5. Housing and Enclosure Requirements
Housing must support terrestrial movement, retreat construction and environmental choice.
Adult enclosure dimensions
For a small to medium-sized adult, a practical starting enclosure is:
12 × 12 × 12 inches (30 × 30 × 30 cm)
A larger enclosure measuring:
18 × 12 × 12 inches (45 × 30 × 30 cm)
may provide additional floor space.
These dimensions are practical recommendations rather than scientifically established minimums.
Floor space
Provide sufficient room for movement, turning, shelter and drinking.
Substrate depth
Approximately 5–7 inches (13–18 cm) of compactable substrate is a useful adult starting point.
Burrowing opportunities
Provide a starter excavation beneath a secure hide.
Retreats
Offer at least one ground-level shelter.
Enclosure height
Keep the unobstructed climbing height relatively low.
Fall prevention
Terrestrial tarantulas can suffer serious injuries from falls.
Enclosure security
Use a secure lid or locking doors.
Ventilation
Provide adequate airflow.
Enclosure materials
Glass, acrylic and suitable plastic enclosures may be used.
Mesh considerations
Avoid coarse mesh that may trap claws.
Furnishing stability
Heavy decorations must be supported securely.
Spiderling housing
Spiderlings require small secure containers with proportionate substrate depth, shelter, accessible moisture and ventilation.
Juvenile housing
Increase enclosure dimensions gradually with growth.
Subadult housing
Provide sufficient floor space and opportunities for retreat construction.
Individual housing
House all individuals separately.
6. Substrate and Burrowing
Suitable substrate is essential for terrestrial behaviour.
Recommended materials
- Reptile-safe topsoil.
- Soil and coco coir mixtures.
- Suitable commercial terrestrial tarantula substrate.
Structure
The substrate should be compactable enough to support excavations.
Depth
Approximately 5–7 inches is a practical adult starting point.
Compaction
Lightly compact the substrate during setup.
Starter burrow
Create a shallow excavation beneath cork bark.
Moisture gradient
Maintain slightly moist substrate in one lower area.
Surface conditions
Allow much of the surface to remain relatively dry.
Avoid saturation
Do not maintain permanently waterlogged substrate.
Avoid unsuitable materials
Do not use fertilised compost, pesticide-treated soil or sharp gravel.
Burrow preservation
Avoid unnecessary excavation of established retreats.
7. Furnishings and Environmental Enrichment
Suitable furnishings include:
- Cork bark hides.
- Low stable stones.
- Leaf litter.
- Ground-level shelter.
- A stable drinking-water dish.
- Optional suitable plants.
Environmental choice
Provide more than one sheltered location where space permits.
Stability
Secure heavy items against collapse.
Natural behaviour
Allow excavation and retreat modification.
Avoid climbing hazards
Tall branches and elevated decorations are unnecessary.
8. Temperature and Heating
Because A. catalina is associated with mountain habitats, it should not automatically be maintained at the higher temperatures sometimes recommended for lowland desert species.
Practical starting temperatures
| Condition | Temperature |
|---|---|
| General daytime | Approximately 20–24°C |
| Slightly warmer area | Up to approximately 25°C |
| Cooler retreat | Approximately 19–21°C |
| Night-time | Approximately 17–21°C |
These figures are conservative starting recommendations, not experimentally established species-specific requirements.
Avoid excessive heat
Sustained temperatures approaching 29–30°C should be avoided without evidence that they are suitable.
Heating in Ireland
Supplementary heating may be necessary during colder months.
Ambient heating
Stable room temperatures are generally preferable to intense localised heating.
Thermostatic control
Use suitable temperature control with supplementary heating.
Under-enclosure heating
Avoid heating directly beneath deep substrate.
Temperature monitoring
Measure temperatures in more than one enclosure location.
Seasonal cooling
Do not impose an extreme winter cooling period without reliable species-specific evidence.
9. Lighting and UVB
Specialist UVB lighting is not routinely required.
Day-night cycle
Provide a normal day-night rhythm.
Ambient lighting
Indirect room lighting is generally sufficient.
Display lighting
Low-output LEDs may be used if they do not cause overheating.
Darkness
Provide a proper dark period.
Avoid intense lamps
Powerful basking lamps are unnecessary.
10. Humidity, Ventilation and Hydration
A fixed relative humidity percentage has not been scientifically established for A. catalina.
Water
Provide a clean, stable drinking-water dish.
Substrate moisture
Maintain a moisture gradient rather than uniformly wet substrate.
Lower substrate
A portion may remain slightly moist.
Surface
Allow substantial surface areas to dry between moisture applications.
Ventilation
Maintain effective airflow.
Misting
Routine heavy misting is unnecessary.
Spiderlings
Small containers require closer moisture monitoring.
Warning signs
Persistent condensation, mould or saturated substrate indicate that conditions require adjustment.
Individual observation
Monitor retreat choice, activity and substrate use.
11. Feeding and Nutrition
The Catalina Mountain Tarantula is carnivorous.
Suitable prey
- Crickets.
- Feeder cockroaches.
- Appropriately sized locusts.
- Mealworms.
- Other suitable captive-bred insects.
Spiderlings
Offer appropriately sized small prey.
Juveniles
Approximately weekly feeding is a practical starting point.
Adults
Offer appropriately sized prey approximately every 10–14 days initially.
Adjustments
Modify feeding according to body condition, appetite and moulting.
Fasting
Reduced appetite may occur during premoult.
Uneaten prey
Remove uneaten insects promptly.
Vertebrate prey
Routine feeding of vertebrates is unnecessary.
Wild insects
Avoid wild-caught prey because of pesticide and parasite risks.
12. Calcium and Vitamin Supplementation
Routine reptile calcium and vitamin dusting is not recommended.
Tarantulas consume whole prey.
Maintain feeder insects under appropriate conditions.
No validated reptile-style supplementation schedule exists for this species.
13. Moulting and Growth
Moulting allows growth and renewal of the exoskeleton.
Premoult signs
- Reduced appetite.
- Increased hiding.
- Retreat closure.
- Reduced activity.
- Changes in abdominal appearance.
During moulting
Do not disturb the spider.
A tarantula lying on its back may be moulting normally.
Do not turn it over.
After moulting
Allow the exoskeleton and fangs to harden before feeding.
Larger individuals may require approximately 10–14 days or longer.
Complications
Do not forcibly remove retained exoskeleton.
Seek specialist advice where necessary.
14. Urticating Hairs and Defensive Behaviour
The species possesses urticating hairs.
Defensive responses
A disturbed spider may retreat, release hairs, adopt a defensive posture or bite.
Possible effects
Urticating hairs may cause:
- Itching.
- Skin irritation.
- Eye irritation.
- Respiratory irritation.
Eye exposure
Do not rub the eye.
Seek prompt medical assessment.
Individual variation
Temperament varies.
Prevention
Avoid unnecessary handling.
15. Venom and Bite Safety
The species possesses venom-bearing fangs.
Possible effects
- Puncture wounds.
- Pain.
- Local swelling.
- Redness.
- Individual reactions.
Species-specific clinical evidence is limited.
First aid
Wash the wound with clean running water.
Seek medical advice where appropriate.
Severe allergic symptoms or breathing difficulties require urgent medical attention.
16. Handling and Safe Rehousing
Routine handling is not recommended.
Risks
- Falls.
- Escape.
- Bites.
- Urticating-hair exposure.
- Unnecessary disturbance.
Rehousing equipment
Prepare a secure receiving enclosure, suitable catch cup and soft brush.
Transfer
Gently guide the spider into a transfer container.
Burrowed individuals
Avoid forcibly excavating the spider unless necessary.
Working area
Close doors and windows.
Keep other animals away.
17. Cohabitation
House Catalina Mountain Tarantulas individually.
Risks
- Cannibalism.
- Injury.
- Competition for retreats.
- Feeding interference.
- Stress.
Temporary supervised breeding introductions do not justify permanent cohabitation.
18. Cleaning and Routine Maintenance
Daily
Check water, temperature and enclosure security.
After feeding
Remove uneaten prey.
Weekly
Clean the water dish, remove visible waste and inspect for mould.
Periodically
Review substrate condition, ventilation, equipment and moulting records.
Substrate replacement
Replace contaminated substrate when necessary.
Avoid unnecessary complete enclosure disruption.
19. Common Health Concerns
Dehydration
Ensure access to drinking water.
Moulting complications
Incomplete moults can cause serious injury.
Falls
Abdominal rupture may be fatal.
Mites
Not all small organisms in substrate are parasites.
Persistent mites concentrated on the spider require investigation.
Mould
Persistent mould may indicate excessive moisture or inadequate ventilation.
Feeding refusal
Consider premoult and body condition.
Abnormal posture
Severe leg curling, weakness or unresponsiveness warrants urgent specialist assessment.
Veterinary support
Seek advice from a suitably experienced exotic or invertebrate veterinarian.
20. Quarantine
Maintain new acquisitions separately from established collections.
A precautionary observation period of approximately 60–90 days may be used.
This is not a scientifically validated disease-free interval.
Monitor
- Feeding.
- Moulting.
- Body condition.
- Visible mites.
- Abnormal behaviour.
- Enclosure hygiene.
Use separate equipment where practical.
21. Breeding
Breeding A. catalina requires reliable identification and experience with terrestrial tarantulas.
Identification
Confirm the identity and provenance of both animals.
Sex determination
Examine a suitable moult where possible.
Mature males
Males develop specialised reproductive structures.
Seasonal influences
The species’ mountain environment experiences seasonal temperature and rainfall changes.
However, a specific captive breeding schedule should not be asserted without reliable species-specific evidence.
Pairing
Supervise introductions.
Cannibalism
Females may attack or consume males.
Egg sacs
Successful mating may result in egg-sac production.
Spiderlings
Provide secure accommodation, suitable substrate, accessible moisture and appropriately sized prey.
Records
Maintain accurate parentage, pairing and offspring records.
22. Conservation and Responsible Captive Breeding
Aphonopelma catalina is associated with a geographically restricted mountain region.
Conservation considerations
Restricted distribution can make local habitat conditions particularly important.
However, a formal conservation category should not be assigned without an authoritative assessment.
Habitat pressures
Potential pressures may include habitat disturbance, development and inappropriate collection.
Captive-bred acquisition
Prioritise legally sourced captive-bred individuals with credible provenance.
Wild collection
Do not assume collection is permitted.
Breeding responsibility
Maintain accurate scientific identification and parentage records.
Conservation value
Captive breeding may help reduce demand for wild-collected animals.
It does not replace habitat conservation.
Release
Never release captive tarantulas into the environment.
23. Legal and CITES Information
Current CITES status should be checked against the official CITES Checklist before international trade.
United States
Collection, possession and export requirements may vary by jurisdiction and protected-area status.
European Union
Check applicable wildlife trade, customs and import requirements.
Ireland
Consult the National Parks and Wildlife Service where clarification is required.
Documentation
Retain:
- Scientific identification.
- Supplier details.
- Acquisition date.
- Evidence of lawful origin.
- Captive-bred records where available.
- Relevant permits.
- Breeding records.
Important distinction
Absence from CITES does not necessarily mean that collection or international trade is unrestricted.
24. Common Husbandry Mistakes
- Treating the species as a typical lowland desert tarantula.
- Maintaining excessive temperatures.
- Providing insufficient substrate.
- Using unstable substrate that collapses during excavation.
- Keeping the entire enclosure permanently wet.
- Keeping the enclosure completely dry without drinking water.
- Heating directly beneath deep substrate.
- Using tall enclosures with excessive fall height.
- Leaving live prey during moulting.
- Disturbing sealed retreats.
- Overfeeding.
- Routine handling.
- Communal housing.
- Breeding animals of uncertain identification.
- Assuming closely related Sky Island species require identical conditions.
25. Husbandry Summary
| Requirement | Practical recommendation |
|---|---|
| Scientific name | Aphonopelma catalina |
| Common name | Catalina Mountain Tarantula |
| Native range | Santa Catalina Mountains, Arizona |
| Adult size | Small to medium; assess actual specimen |
| Growth | Likely relatively slow |
| Lifestyle | Terrestrial, retreat-dwelling |
| Adult enclosure | Approximately 12 × 12 × 12 inches |
| Larger enclosure | Approximately 18 × 12 × 12 inches |
| Substrate depth | Approximately 5–7 inches |
| Daytime temperature | Approximately 20–24°C |
| Night-time temperature | Approximately 17–21°C |
| Moisture | Gradient with relatively dry surface |
| Ventilation | Effective airflow |
| Water | Clean drinking-water dish |
| Lighting | Normal day-night cycle |
| UVB | Not routinely required |
| Diet | Suitable captive-bred feeder insects |
| Moulting | Do not disturb |
| Urticating hairs | Present |
| Venom | Present |
| Handling | Not recommended |
| Cohabitation | Solitary |
| Experience | Intermediate to advanced |
| CITES | Verify current status |
26. References and Further Reading
- 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. Aphonopelma catalina. Natural History Museum Bern. https://wsc.nmbe.ch
- Foelix, R. F. Biology of Spiders. General reference for spider anatomy and behaviour.
- CITES. Checklist of CITES Species. https://checklist.cites.org
- National Parks and Wildlife Service, Ireland. https://www.npws.ie
Evidence Note
The scientific description, taxonomic placement and association with the Santa Catalina Mountains are documented in the 2016 revision of United States Aphonopelma.
Detailed species-specific captive husbandry research remains limited.
The enclosure dimensions, temperature ranges, feeding intervals and moisture-management recommendations are provisional husbandry guidance rather than experimentally validated requirements.
Precise longevity, natural microclimate and captive breeding parameters require further reliable documentation.
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