Texas Tan Tarantula (Aphonopelma anax)
Comprehensive Species Care Guide — The Vivarium Vault
Quick Facts
| Category | Information |
|---|---|
| Common name | Texas Tan Tarantula |
| Alternative name | Kingsville Bronze Brown |
| Scientific name | Aphonopelma anax |
| Scientific authority | (Chamberlin, 1940) |
| Family | Theraphosidae |
| Native distribution | Southern Texas, USA, and north-eastern Mexico |
| Type locality | Kingsville, Kleberg County, Texas |
| Natural habitat | Warm lowland grassland, scrub and open terrestrial habitats |
| Adult leg span | Commonly around 5 inches (13 cm); some large females approximately 6 inches (15 cm) |
| Lifestyle | Terrestrial, burrowing |
| Activity | Primarily crepuscular and nocturnal |
| Temperament | Individual variation; may retreat or release defensive hairs |
| Diet | Invertebrates |
| Female lifespan | Potentially long-lived; precise species-specific maximum not established |
| Urticating hairs | Present |
| Venom | Present |
| Cohabitation | Solitary |
| Experience level | Intermediate |
| Captive availability | Occasional; identification and provenance should be verified |
Husbandry evidence: Taxonomy and distribution are supported by published scientific literature. The enclosure dimensions, temperature ranges and feeding schedules below are practical captive-care recommendations, not experimentally established physiological limits.
1. Species Overview
The Texas Tan Tarantula, Aphonopelma anax, is one of the larger tarantulas native to the United States.
It is associated particularly with the warm lowland environments of southern Texas and neighbouring north-eastern Mexico.
The species was originally described in 1940 under the name Dugesiella anax. Subsequent taxonomic work placed it in Aphonopelma.
Its relatively large size distinguishes it from the numerous small and medium-sized species of the genus.
Females may be substantial, heavy-bodied spiders, while mature males typically have longer, more slender legs and specialised reproductive structures.
Although sometimes described as a desert tarantula, its native region includes a mixture of grassland, coastal plain, scrub and other warm terrestrial environments.
The spider’s relationship with its burrow is central to its natural history.
A suitable retreat provides security, protection from excessive surface temperatures and a location for moulting and prolonged periods of inactivity.
In captivity, the species requires adequate horizontal space, substantial substrate depth, a secure retreat and reliable access to drinking water.
It should not be treated as an arboreal species or housed in a tall, sparsely furnished display enclosure.
2. Taxonomy and Identification
Scientific classification
- Kingdom: Animalia
- Phylum: Arthropoda
- Class: Arachnida
- Order: Araneae
- Infraorder: Mygalomorphae
- Family: Theraphosidae
- Genus: Aphonopelma
- Species: Aphonopelma anax
Original description
Chamberlin, 1940.
Original combination
Dugesiella anax Chamberlin, 1940.
Synonymy
Aphonopelma breenei Smith, 1995, was synonymised with A. anax by Hamilton, Hendrixson and Bond in 2016.
The former name should not be used for a separate breeding line without further taxonomic evidence.
Appearance
Individuals may exhibit tan, bronze-brown or darker colouration.
Appearance varies with age, sex and the time elapsed since moulting.
Adult females
Adult females tend to have a robust abdomen, broad body and relatively substantial build.
Mature males
Mature males typically have proportionately longer legs and reproductive bulbs on the pedipalps.
Similar species
Other Texan Aphonopelma, including A. hentzi, may be confused with this species.
Identification
Colour alone is insufficient for reliable identification.
For breeding or specialist collections, consult the published taxonomic characters and retain accurate provenance.
3. Natural Distribution and Ecology
Geographic range
Aphonopelma anax is associated with southern Texas and north-eastern Mexico.
Type locality
Kingsville, Kleberg County, Texas, USA.
Regional environment
Southern Texas includes coastal plains, scrubland, grassland and areas of seasonally variable rainfall.
Temperature
The region can experience high summer temperatures.
However, exposed outdoor temperatures do not necessarily represent conditions inside an occupied tarantula burrow.
Rainfall
Rainfall varies seasonally and geographically.
The species should not automatically be regarded as requiring completely dry substrate throughout its enclosure.
Burrowing
As a terrestrial Aphonopelma, it should have access to a suitable retreat and substrate that permits excavation.
Precise natural burrow measurements are not established in this guide.
Activity
The species is generally associated with ground-level activity, particularly under lower-light conditions.
Predation
Potential natural predators include vertebrates and other animals capable of locating exposed tarantulas.
Feeding ecology
It is expected to consume suitable terrestrial invertebrates.
A comprehensive published species-specific prey inventory is unavailable.
Captive implications
Provide secure shelter, sufficient substrate and a modest moisture gradient rather than attempting to reproduce extreme surface conditions.
4. Adult Size, Growth and Lifespan
Adult size
Aphonopelma anax is among the larger North American tarantulas.
Adult leg spans are commonly reported around:
5 inches (13 cm)
Some large females may approach:
6 inches (15 cm)
These figures should be treated as approximate, not guaranteed adult measurements.
Sexual dimorphism
Females are generally heavier-bodied.
Mature males often appear more slender and long-legged.
Growth rate
Growth depends on temperature, feeding, sex and individual variation.
A validated species-specific captive growth schedule is unavailable.
Female lifespan
Females may live for many years, but a reliable maximum lifespan for A. anax has not been established.
Male lifespan
Mature males generally have a shorter remaining lifespan than adult females.
Record keeping
Record moulting, feeding, body condition, behaviour and reproductive development.
5. Housing and Enclosure Requirements
This is a substantial terrestrial tarantula and should be housed accordingly.
Adult enclosure dimensions
A suitable practical starting size is:
18 × 12 × 12 inches (45 × 30 × 30 cm)
For a particularly large adult female, or where additional space is desired:
24 × 18 × 12 inches (60 × 45 × 30 cm)
These dimensions are husbandry recommendations, not scientifically validated minimums.
Floor space
Prioritise horizontal floor area over enclosure height.
The spider should be able to move freely around its retreat and water dish.
Substrate depth
Provide approximately:
6–8 inches (15–20 cm)
of compactable substrate, adjusting enclosure height accordingly.
Retreat
Provide a stable cork bark hide or suitable artificial ground-level shelter.
Starter burrow
A shallow excavation beneath the hide may encourage burrowing.
Substrate stability
Substrate should support excavation without collapsing readily.
Fall prevention
Keep the exposed distance between substrate and enclosure roof low.
A large terrestrial tarantula may sustain serious injury if it falls.
Ventilation
Provide effective airflow without creating large gaps or excessive drying.
Enclosure security
Check doors, lids, vents, cable holes and feeding hatches.
Heavy furnishings
Support stones and other heavy decorations securely.
Enclosure materials
Suitable glass, acrylic or rigid plastic enclosures may be used.
Mesh
Avoid coarse mesh that can trap claws.
Juvenile housing
A juvenile can be kept in a smaller enclosure, increasing the dimensions as it grows.
Provide meaningful substrate depth and a suitable hide from an early stage.
Spiderling housing
Use proportionately sized secure containers with fine ventilation.
Small spiderlings require closer attention to substrate moisture and feeder size.
Individual housing
Keep each tarantula separately.
6. Substrate and Burrowing
Suitable substrate
A mixture may include:
- Reptile-safe topsoil.
- Soil-based tarantula substrate.
- Coco coir blended with topsoil.
- A modest proportion of clean sand where useful for structure.
Substrate depth
Approximately 6–8 inches is a practical adult starting point.
Compaction
Lightly compact the substrate during setup.
Moisture gradient
Maintain a slightly moist lower area while allowing much of the surface to remain relatively dry.
Burrow construction
Allow the spider to excavate and reinforce its retreat with silk.
Retreat closure
Burrow closure may accompany moulting or prolonged inactivity.
Avoid
Do not use fertilised compost, pesticide-treated soil, sharp gravel or aromatic wood shavings.
Loose sand alone is not an appropriate substitute for stable burrowing substrate.
Disturbance
Avoid unnecessarily excavating established retreats.
7. Furnishings and Environmental Enrichment
Suitable furnishings include cork bark, low stable hides, limited leaf litter and a shallow water dish.
Provide both sheltered and more open ground-level areas.
Allow the spider to modify substrate and place silk.
Avoid elevated climbing structures and heavy unsecured objects.
8. Temperature and Heating
The species occurs in a warm region, but its preferred captive thermal range has not been established experimentally.
Provisional temperature recommendations
| Area or period | Temperature |
|---|---|
| General daytime | 22–26°C |
| Slightly warmer area | Up to approximately 27°C |
| Cooler retreat | Approximately 20–23°C |
| Night-time | Approximately 19–22°C |
These are conservative captive starting points rather than validated physiological limits.
Thermal choice
Provide a sheltered cooler area.
Heating in Ireland
Supplementary heating may be required in colder rooms, particularly during winter.
Heating equipment
Where heating is necessary, use appropriately controlled equipment.
Thermostats
Use a thermostat with any dedicated heating system.
Substrate heating
Avoid concentrated heating directly beneath deep substrate.
Monitoring
Measure actual enclosure temperatures.
Excessive heat
Do not expose the enclosure to direct sunlight or extreme temperatures.
9. Lighting and UVB
Provide a regular light-dark cycle.
Normal indirect room lighting is generally adequate.
Dedicated UVB lighting is not routinely required for tarantulas.
Low-output display lighting may be used if it does not increase temperatures excessively.
Avoid intense basking lamps and direct sunlight.
10. Humidity, Ventilation and Hydration
No experimentally validated humidity percentage is available for A. anax.
Drinking water
Provide a stable, shallow water dish.
Moisture gradient
Maintain a slightly moist area within the lower substrate.
Surface conditions
Allow substantial areas of the surface to remain relatively dry.
Ventilation
Provide effective air exchange.
Spiderlings
Small enclosures may dry rapidly and require closer observation.
Misting
Routine heavy misting is unnecessary.
Warning signs
Persistent condensation, mould and waterlogged substrate indicate conditions that require correction.
Burrow protection
Avoid flooding occupied retreats.
11. Feeding and Nutrition
Aphonopelma anax is a carnivorous predator.
Suitable prey
- Captive-bred crickets.
- Appropriately sized feeder cockroaches.
- Mealworms.
- Other suitable feeder insects.
Spiderlings
Offer very small prey or appropriately sized portions of freshly killed insects.
Juveniles
Weekly feeding may be used as an initial starting point.
Adults
Offer suitable prey approximately every 7–14 days initially.
Adjust frequency according to appetite, body condition and moulting.
Prey size
Avoid prey that is excessively large or powerful.
Body condition
Do not encourage excessive abdominal enlargement through overfeeding.
Uneaten prey
Remove uneaten insects promptly, especially during premoult.
Wild insects
Avoid wild-caught feeders because of pesticide and parasite risks.
Vertebrate prey
Vertebrate feeding is unnecessary.
12. Calcium and Vitamin Supplementation
Routine reptile-style calcium or vitamin dusting is not required.
Tarantulas obtain nutrients from whole prey.
Maintain feeder insects appropriately.
There is no validated supplementation schedule for this species.
13. Moulting and Growth
Possible premoult signs
- Reduced appetite.
- Increased concealment.
- Reduced activity.
- Retreat closure.
- 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 offering prey.
Complications
Do not forcibly remove retained exoskeleton.
Seek specialist advice if a moult appears seriously compromised.
14. Urticating Hairs and Defensive Behaviour
Aphonopelma tarantulas possess defensive urticating hairs.
A disturbed spider may retreat, release hairs, adopt a defensive posture or bite.
Urticating hairs can cause skin, eye or respiratory irritation.
Avoid touching the eyes after enclosure maintenance.
If hairs enter an eye, do not rub it; seek prompt medical assessment.
Individual defensive behaviour varies.
15. Venom and Bite Safety
Aphonopelma anax possesses venom-bearing fangs.
A bite may cause puncture wounds, pain, redness or swelling.
Detailed species-specific clinical evidence is limited.
Wash bite wounds 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.
Main risks
- Falls.
- Escape.
- Bites.
- Urticating-hair exposure.
- Unnecessary disturbance.
Rehousing procedure
- Prepare the receiving enclosure.
- Work in a secure area.
- Use a suitably sized catch cup and soft brush.
- Gently guide the spider into the transfer container.
- Move it into the new enclosure.
- Confirm that all openings are secured.
Avoid unnecessary excavation of established retreats.
17. Cohabitation
House Aphonopelma anax individually.
Communal housing creates risks of injury, cannibalism, competition and feeding interference.
Temporary supervised breeding introductions do not justify permanent cohabitation.
18. Cleaning and Routine Maintenance
Regular checks
Check water, temperature, ventilation and enclosure security.
After feeding
Remove uneaten prey.
Weekly
Clean the water dish, remove visible waste and inspect for mould.
Periodically
Inspect substrate condition and equipment.
Retreat preservation
Avoid unnecessary destruction of established silk-lined retreats.
Substrate replacement
Replace contaminated substrate when required rather than routinely stripping a stable enclosure.
19. Common Health Concerns
Dehydration
Ensure access to drinking water and suitable substrate moisture.
Moulting complications
Incomplete moults can cause serious injury.
Falls
Abdominal injuries may be life-threatening.
Mites
Not all small organisms in substrate are parasites. Persistent mites concentrated on the spider require investigation.
Mould
Persistent mould may indicate excess moisture or poor ventilation.
Feeding refusal
Consider premoult, seasonal inactivity and body condition.
Abnormal posture
Severe leg curling, weakness or unresponsiveness requires urgent specialist assessment.
Consult a suitably experienced exotic or invertebrate veterinarian.
20. Quarantine
Keep new acquisitions separate from established collections.
A precautionary observation period of approximately 60–90 days may be used, although this is not a validated disease-free interval.
Monitor feeding, moulting, body condition, visible mites and abnormal behaviour.
Use separate maintenance equipment where practical.
Retain identification and acquisition records.
21. Breeding and Reproduction
Breeding should only be attempted with reliably identified animals.
Sex determination
Examine suitable moults where possible.
Mature males
Mature males develop specialised reproductive structures.
Seasonal timing
Natural reproductive activity may be influenced by seasonal temperature and rainfall patterns.
A single validated captive breeding season is not established here.
Pairing
Introduce adults only under close supervision.
Females may attack or consume males.
Egg sacs
Successful mating may result in egg-sac production.
Incubation
A validated species-specific captive incubation protocol is unavailable.
Spiderlings
Provide secure, appropriately sized accommodation and suitable small prey.
Records
Maintain parentage, pairing, moult and offspring records.
Hybridisation
Do not pair A. anax with other Aphonopelma species.
22. Conservation and Responsible Captive Breeding
The species occurs in southern Texas and neighbouring north-eastern Mexico.
Habitat pressures
Potential concerns include land development, habitat fragmentation, agricultural changes and inappropriate collection.
Population status
Do not assign a formal conservation category without consulting an authoritative assessment.
Captive-bred acquisition
Prioritise legally sourced captive-bred individuals with credible provenance.
Wild collection
Do not assume collection is permitted.
Breeding responsibility
Maintain accurate identification and parentage records.
Conservation value
Responsible captive breeding may help reduce collection pressure, but does not replace habitat protection.
Release
Never release captive tarantulas into the environment.
23. Legal and CITES Information
United States
Collection, possession and export requirements may vary by state and land ownership.
Mexico
Collection and export may be subject to Mexican wildlife legislation.
CITES
Check the current CITES Checklist before international trade.
European Union
Check applicable customs, import and wildlife trade requirements.
Ireland
Consult the National Parks and Wildlife Service where clarification is required.
Documentation
Retain:
- Scientific identification.
- Supplier information.
- Acquisition date.
- Evidence of lawful origin.
- Captive-breeding records.
- Relevant permits.
Absence from CITES does not necessarily mean collection or international trade is unrestricted.
24. Common Husbandry Mistakes
- Confusing A. anax with other Texas tarantulas.
- Treating A. breenei as a separate accepted species.
- Identifying the spider from colour alone.
- Providing an enclosure with inadequate floor space.
- Providing insufficient substrate depth.
- Using unstable substrate.
- Providing excessive enclosure height.
- Leaving escape-sized ventilation openings.
- Keeping the entire substrate permanently wet.
- Providing no drinking water.
- Overheating the enclosure.
- Heating directly beneath deep substrate.
- Offering excessively large prey.
- Leaving live prey during moulting.
- Disturbing established retreats unnecessarily.
- Routine handling.
- Communal housing.
- Breeding animals of uncertain identity.
25. Husbandry Summary
| Requirement | Practical recommendation |
|---|---|
| Common name | Texas Tan Tarantula |
| Scientific name | Aphonopelma anax |
| Authority | (Chamberlin, 1940) |
| Native range | Southern Texas and north-eastern Mexico |
| Adult size | Approximately 5–6 inches leg span |
| Lifestyle | Terrestrial, burrowing |
| Adult enclosure | Approximately 18 × 12 × 12 inches |
| Larger enclosure | Approximately 24 × 18 × 12 inches |
| Substrate depth | Approximately 6–8 inches |
| Daytime temperature | Approximately 22–26°C |
| Night-time temperature | Approximately 19–22°C |
| Moisture | Modest gradient; relatively dry surface |
| Ventilation | Effective, escape-proof airflow |
| Drinking water | Clean, accessible water dish |
| Lighting | Normal day-night cycle |
| UVB | Not routinely required |
| Diet | Captive-bred feeder insects |
| Urticating hairs | Present |
| Venom | Present |
| Handling | Not recommended |
| Cohabitation | Solitary |
| Experience level | Intermediate |
| CITES | Verify current status |
These numerical husbandry recommendations are provisional captive starting points, not proven species-specific physiological limits.
26. References and Further Reading
- Chamberlin, R. V. (1940). New American tarantulas of the family Aviculariidae. Bulletin of the University of Utah, 30(13), 1–39.
- 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 anax (Chamberlin, 1940). Natural History Museum Bern. World Spider Catalog
- Foelix, R. F. Biology of Spiders. General reference for spider anatomy and physiology.
- CITES. Checklist of CITES Species. https://checklist.cites.org
- National Parks and Wildlife Service, Ireland. https://www.npws.ie
Evidence Note
The accepted scientific name, 1940 original description, synonymy of A. breenei and South Texas distribution are supported by published taxonomic records.
The enclosure dimensions, temperature ranges, substrate depth, feeding intervals and moisture-management recommendations are provisional captive husbandry guidance.
Detailed species-specific captive longevity, preferred thermal conditions, natural burrow architecture and breeding protocols remain insufficiently documented.
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