# Tucson Bronze Tarantula (Aphonopelma vorhiesi) **URL:** https://reptilecommunity.com/t/tucson-bronze-tarantula-aphonopelma-vorhiesi/874 **Category:** Invertebrates **Created:** [October 11, 2026, 1:35pm UTC](https://reptilecommunity.com/t/tucson-bronze-tarantula-aphonopelma-vorhiesi/874 "2026-10-11T13:35:20Z") **Posts on this page:** 2 **Page:** 1
### Author: ![ReptileCommunity](https://reptilecommunity.com/user_avatar/reptilecommunity.com/reptilecommunity/32/3_2.png) [@ReptileCommunity](https://reptilecommunity.com/u/ReptileCommunity) #### Post date: [October 11, 2026, 1:35pm UTC](https://reptilecommunity.com/t/tucson-bronze-tarantula-aphonopelma-vorhiesi/874/1 "2026-10-11T13:35:20Z")
# Tucson Bronze Tarantula (_Aphonopelma vorhiesi_) **Comprehensive Care Guide – The Vivarium Vault** ## Quick Facts | Category | Information | | --- | --- | | Scientific name | _Aphonopelma vorhiesi_ | | Scientific authority | (Chamberlin & Ivie, 1939) | | Common name | Tucson Bronze Tarantula | | Family | Theraphosidae | | Native distribution | South-eastern Arizona, United States | | Natural habitats | Desert margins, grassland, foothills and mountain-associated environments | | Adult size | Small to medium-sized tarantula; exact dimensions vary | | Lifestyle | Terrestrial and burrowing | | Activity | Primarily crepuscular and nocturnal | | Growth rate | Generally slow | | Female lifespan | Potentially many years; reliable species-specific maximum uncertain | | Diet | Carnivorous | | Urticating hairs | Present | | Venom | Present | | Cohabitation | Solitary | | Experience level | Intermediate | | CITES | Current listing should be verified | | Main husbandry priority | Secure terrestrial housing with stable retreats and a moisture gradient | ## 1. Species Overview The Tucson Bronze Tarantula (_Aphonopelma vorhiesi_) is a North American terrestrial tarantula associated with south-eastern Arizona. It belongs to the family Theraphosidae and the genus _Aphonopelma_. Unlike some of the larger, more familiar American tarantulas, _A. vorhiesi_ is associated with a group of species that includes several mountain-dwelling forms. Its natural history is therefore more complicated than the common description of a desert tarantula might suggest. Although the species occurs in areas influenced by the Sonoran Desert, its habitats can include grassland and mountain-associated environments. These habitats experience considerable variation in rainfall, temperature, elevation and seasonal activity. In captivity, the species requires a secure terrestrial enclosure, sufficient substrate for excavation, suitable shelter, access to drinking water and appropriate ventilation. Its tendency to remain concealed should be respected. Routine handling is not recommended because of the risks of falls, escape, urticating hairs and bites. ## 2. Taxonomy and Identification The accepted scientific name is _Aphonopelma vorhiesi_ (Chamberlin & Ivie, 1939). ### Taxonomic history The 2016 revision of United States _Aphonopelma_ recognised _A. vorhiesi_ as a valid species. It placed the following names in synonymy: - _Aphonopelma jungi_ - _Aphonopelma punzoi_ Older publications and animal records may therefore use names that are no longer accepted. ### Species group _A. vorhiesi_ belongs to the Marxi species group. This group includes several species associated with the Madrean Sky Islands of the American Southwest. ### Appearance Freshly moulted individuals within this group are generally dark, often appearing black. Colouration may change as the exoskeleton ages. ### Common-name limitations The name Tucson Bronze is not a reliable diagnostic characteristic. ### Similar species Confusion is possible with related Arizona species, including _Aphonopelma peloncillo_. ### Identification Reliable identification may require locality information, morphological examination and specialist taxonomic expertise. ### Sex determination Examination of a suitable moult is generally preferred. ### Breeding precaution Do not breed animals of uncertain identity. ## 3. Natural Distribution and Ecology _Aphonopelma vorhiesi_ is associated with south-eastern Arizona. ### Habitat The species occupies a mixture of terrestrial environments, including lower-elevation grassland or desert habitats and areas associated with the region’s mountain systems. ### Madrean Sky Islands The Sky Islands are isolated mountain ranges separated by lower-elevation valleys. Their elevation differences produce substantial environmental variation over relatively short distances. ### Why this matters A tarantula associated with this region should not automatically be maintained under the same conditions as a species restricted to extremely hot, low-elevation desert. ### Burrows Like many _Aphonopelma_, the species uses protected ground-level retreats. ### Burrow functions Retreats provide protection from predators, surface heat, drying conditions and environmental disturbance. ### Seasonal rainfall South-eastern Arizona experiences seasonal rainfall patterns, including summer monsoon activity. However, the precise response of _A. vorhiesi_ to seasonal rainfall should not be inferred solely from observations of other Arizona species. ### Activity Surface activity is expected to vary with temperature, moisture and reproductive condition. ### Captive implications Provide environmental choice and avoid permanently extreme conditions. ## 4. Adult Size, Growth and Lifespan ### Adult size _A. vorhiesi_ is generally regarded as a small to medium-sized _Aphonopelma_. Reliable adult measurements should be taken from the animal itself rather than relying on an unsupported universal leg-span figure. ### Growth rate Growth is generally slow. ### Females Females may be long-lived, but a reliable species-specific maximum lifespan is not established here. ### Males Males generally have shorter remaining lifespans after reaching sexual maturity. ### Individual variation Growth depends on sex, feeding, temperature and individual development. ### Records Maintain a record of moults, size changes and feeding behaviour. * * * ## 5. Housing and Enclosure Requirements The enclosure must prioritise safe terrestrial movement and opportunities for retreat construction. ### Adult enclosure For a typical 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)** can provide additional floor space. The appropriate dimensions depend on the spider’s actual size. These are practical husbandry recommendations rather than scientifically established minimum requirements. ### Floor space Provide sufficient horizontal space for movement, a retreat and a water dish. ### Substrate depth Approximately **5–7 inches (13–18 cm)** of compactable substrate is a useful adult starting point. ### Burrowing Provide enough depth for excavation and a suitable starter retreat. ### Enclosure height Keep unobstructed climbing height low. ### Fall prevention Avoid tall decorations and elevated hard surfaces. ### Security Use a secure lid or locking doors. ### Ventilation Provide effective air exchange. ### Materials Suitable glass, acrylic or plastic enclosures may be used. ### Mesh Avoid coarse mesh that may trap claws. ### Heavy furnishings Support heavy items securely so excavation cannot cause collapse. ### Spiderling housing Spiderlings require smaller secure containers with proportionate substrate depth, a retreat, accessible moisture and suitable ventilation. ### Juveniles Increase enclosure size gradually as the animal grows. ### Subadults Provide adequate floor space and substrate depth for normal retreat construction. ### Individual housing House all individuals separately. ## 6. Substrate and Burrowing Suitable substrate should support excavation without repeated collapse. ### Recommended materials - Reptile-safe topsoil. - Suitable soil-based mixtures. - Coco coir mixed with topsoil. - Commercial terrestrial tarantula substrate. ### Structure Lightly compact the substrate during setup. ### Depth Aim for approximately 5–7 inches for adults, adjusting to actual size and burrowing behaviour. ### Moisture gradient Maintain slightly moist substrate in one lower area while allowing much of the surface to remain relatively dry. ### Starter burrow Provide a shallow excavation beneath a secure cork bark hide. ### Avoid Do not use fertilised compost, pesticide-treated soil, sharp gravel or strongly scented wood products. ### Burrow preservation Avoid digging out a concealed spider unnecessarily. ## 7. Furnishings and Enrichment Provide: - Cork bark hides. - Low ground-level shelters. - Leaf litter. - A stable water dish. - Optional low artificial or suitable live plants. ### Shelter choice More than one retreat may allow the spider to select its preferred location. ### Stability Secure all heavy decorations. ### Natural behaviour Excavation, retreat modification and occasional exploration are appropriate behaviours. ### Avoid climbing structures Tall branches and elevated platforms are unnecessary. ## 8. Temperature and Heating The species occurs in a region with considerable environmental variation. A moderate captive range is preferable to reproducing extreme desert temperatures. | Condition | Practical starting range | | --- | --- | | General daytime | 21–25°C | | Slightly warmer area | Up to approximately 26°C | | Cooler retreat | Approximately 20–22°C | | Night-time | Approximately 18–22°C | These ranges are provisional recommendations, not experimentally established species-specific limits. ### Heating in Ireland Supplementary heating may be necessary during winter. ### Preferred approach Stable room heating is often preferable to intense localised heat. ### Thermostats Any supplementary heating should be controlled appropriately. ### Under-enclosure heating Avoid placing heat mats beneath deep substrate. ### Temperature monitoring Measure temperatures within the enclosure rather than relying solely on room readings. ### Overheating Avoid sustained excessive temperatures, particularly in small enclosures. ## 9. Lighting and UVB Specialist UVB lighting is not routinely required. ### Day-night cycle Provide a normal light-dark rhythm. ### Ambient light Indirect room lighting is generally sufficient. ### Display lighting Low-output LED lighting may be used if it does not cause overheating. ### Darkness Provide a proper dark period. ### Avoid Do not use intense basking lamps or unnecessary night-time lighting. ## 10. Humidity, Ventilation and Hydration A fixed relative humidity percentage has not been scientifically established for captive _A. vorhiesi_. ### Drinking water Provide clean drinking water in a stable dish. ### Moisture gradient Allow the spider to access both relatively dry surface areas and slightly moist lower substrate. ### Ventilation Maintain effective airflow. ### Misting Routine heavy misting is unnecessary. Where substrate moisture needs replenishing, add water to one area rather than saturating the entire enclosure. ### Spiderlings Small containers require closer moisture monitoring because they can dry rapidly. ### Warning signs Persistent condensation, mould or saturated substrate should prompt a review of enclosure conditions. ### Seasonal considerations Seasonal rainfall in the native region does not justify maintaining permanently wet captive conditions. ## 11. Feeding and Nutrition The Tucson Bronze Tarantula is a carnivorous predator. ### Suitable prey - Crickets. - Feeder cockroaches. - Small locusts. - Appropriately sized mealworms. - Other suitable captive-bred insects. ### Spiderlings Offer appropriately sized small prey. ### Juveniles Approximately weekly feeding is a practical starting point. ### Adults Offer suitable prey approximately every 10–14 days initially. ### Adjustments Modify feeding frequency according to body condition, appetite, growth and moulting. ### Premoult Feeding refusal may occur before moulting. ### Uneaten prey Remove uneaten insects promptly. ### Wild insects Avoid wild-caught feeders because of pesticide and parasite risks. ### Vertebrate prey Routine vertebrate feeding is unnecessary. ## 12. Calcium and Vitamin Supplementation Routine reptile calcium or vitamin dusting is not required. 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 is essential for 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 spider 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. Smaller spiders may recover sooner than large adults. ### Complications Do not forcibly remove retained exoskeleton. Seek specialist advice when necessary. ## 14. Urticating Hairs and Defensive Behaviour The species possesses defensive urticating hairs. ### Defensive responses A disturbed spider may retreat, release hairs, adopt a defensive posture or bite. ### Possible effects Urticating hairs can cause itching, skin irritation and eye irritation. ### Eye exposure Do not rub the affected eye. Seek prompt medical assessment. ### Individual differences Behaviour varies between individuals. ### Risk reduction Avoid unnecessary handling and use suitable maintenance tools. ## 15. Venom and Bite Safety The species possesses venom-bearing fangs. ### Possible bite effects - Puncture wounds. - Pain. - Local swelling. - Redness. - Individual reactions. Detailed 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 suitable catch cup, soft brush and secure receiving enclosure. ### Transfer Gently guide the spider into a transfer container. ### Burrowed individuals Avoid forcibly excavating the spider unless necessary. ### Working area Close doors and windows and keep other animals away. ## 17. Cohabitation House Tucson Bronze Tarantulas individually. ### Risks - Cannibalism. - Injuries. - Competition for shelter. - Feeding interference. - Stress. Temporary supervised breeding introductions do not justify permanent cohabitation. ## 18. Cleaning and Routine Maintenance ### Daily Check drinking water, enclosure security and temperature. ### 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 drinking water remains available. ### Moulting complications Incomplete moults can cause serious injury. ### Falls Abdominal rupture can 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. ## 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 maintenance equipment where practical. ## 21. Breeding Breeding 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’ natural environment experiences seasonal temperature and rainfall changes. However, a specific captive breeding schedule should not be asserted without reliable species-specific evidence. ### Introductions Supervise all pairing attempts. ### 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 records of parentage, pairing, egg sacs and offspring development. ## 22. Conservation and Responsible Captive Breeding The species occurs within a region recognised for substantial tarantula diversity. ### Habitat concerns Habitat disturbance, development and inappropriate collection may affect local populations. ### Captive-bred acquisition Prioritise legally sourced captive-bred individuals with credible provenance. ### Identification Accurate species identification is particularly important because closely related Arizona _Aphonopelma_ can be difficult to distinguish. ### Wild collection Do not assume collection is permitted simply because the species occurs in a particular region. ### Breeding records Maintain reliable parentage and origin records. ### 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. ### European Union Check applicable wildlife trade, customs and import requirements. ### Ireland The National Parks and Wildlife Service is an appropriate authority for clarification of relevant wildlife trade controls. ### 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 exclusively lowland desert-dwelling. - Providing insufficient substrate. - Using unstable substrate that collapses during excavation. - Keeping the entire enclosure permanently wet. - Keeping the enclosure completely dry without reliable drinking water. - Applying uncontrolled heat. - 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. ## 25. Husbandry Summary | Requirement | Practical recommendation | | --- | --- | | Scientific name | _Aphonopelma vorhiesi_ | | Common name | Tucson Bronze Tarantula | | Native range | South-eastern Arizona | | Adult size | Small to medium; house according to actual dimensions | | Growth | Generally slow | | Lifestyle | Terrestrial and burrowing | | Adult enclosure | Approximately 12 × 12 × 12 inches | | Larger enclosure | Approximately 18 × 12 × 12 inches | | Substrate depth | Approximately 5–7 inches | | Daytime temperature | Approximately 21–25°C | | Night-time temperature | Approximately 18–22°C | | Moisture | Drier surface with some slightly moist lower substrate | | Ventilation | Effective airflow | | Water | Stable 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 | | CITES | Verify current listing | ## 26. References and Further Reading 1. 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](https://doi.org/10.3897/zookeys.560.6264) 2. World Spider Catalog. _Aphonopelma vorhiesi_. Natural History Museum Bern. [https://wsc.nmbe.ch](https://wsc.nmbe.ch) 3. Foelix, R. F. _Biology of Spiders_. General reference for spider anatomy and behaviour. 4. CITES. Checklist of CITES Species. [https://checklist.cites.org](https://checklist.cites.org) 5. National Parks and Wildlife Service, Ireland. [https://www.npws.ie](https://www.npws.ie) ### Evidence Note The accepted species identity, placement within the Marxi species group, synonymy and association with both mountain-influenced and lower-elevation habitats are supported by published taxonomic research. The enclosure dimensions, captive temperature ranges, feeding intervals and moisture-management recommendations are practical husbandry guidance rather than experimentally validated requirements for _Aphonopelma vorhiesi_. Precise species-specific longevity and captive breeding parameters 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](http://ReptileCommunity.com) | Revised: October 2026** ---
### Author: ![ReptileCommunity](https://reptilecommunity.com/user_avatar/reptilecommunity.com/reptilecommunity/32/3_2.png) [@ReptileCommunity](https://reptilecommunity.com/u/ReptileCommunity) #### Post date: [October 11, 2026, 1:35pm UTC](https://reptilecommunity.com/t/tucson-bronze-tarantula-aphonopelma-vorhiesi/874/2 "2026-10-11T13:35:46Z")