Aphonopelma seemanni

🔤 Taxonomy

Aphonopelma seemanni is the currently accepted scientific name. World Spider Catalog treats it as accepted and as the type species of Aphonopelma.

Older records and hobby material may use Eurypelma seemanni, Rhechostica seemanni, or the synonym Aphonopelma latens. Use current scientific name, locality, and source records when comparing animals.

English common names and hobby labels:

• Costa Rican zebra tarantula
• Costa Rican striped-knee tarantula
• striped-knee tarantula

📌 Description

Aphonopelma seemanni is a deep-burrowing Central American terrestrial tarantula with bold pale striping on the legs. It is common in the pet trade, but it is faster and more nervous than many keepers expect from an Aphonopelma.

Adults are usually around 10-14 cm legspan. Females can live for many years, while mature males become more mobile and short-lived after maturity.

The main care point is the burrow. A shallow display box makes this species feel exposed, so plan for deep substrate, a secure hide entrance, clean water, and maintenance that does not collapse the tunnel.

Individual behaviour varies. Some specimens retreat at the first vibration, while others rush toward movement as if it were prey. Neither apparent calmness nor a strong feeding response makes handling safe: a fall can rupture the abdomen, and kicked urticating hairs can irritate skin, eyes, and airways. Use a catch cup and long tools instead of hands whenever the enclosure is open.

🌍 Distribution

World Spider Catalog lists the distribution as El Salvador, Honduras, Nicaragua, and Costa Rica. The species is associated with open ground, scrub, seasonal forest edge, and burrows that buffer heat and dryness.

In a terrarium, this means a warm terrestrial setup with deep substrate and a moisture gradient, not a wet swamp box. The burrow should offer a more humid retreat while the surface can dry between maintenance days.

🌡 Climate across the native range

Monthly climate normals from reviewed GBIF occurrence locations:

Weather data by WorldClim v2.1 · Monthly normals queried by Herpeton Academy from raster values; relative humidity is derived from vapor pressure and mean temperature.

Location references use GBIF.org occurrence data where available; original occurrence records retain their source dataset licenses.

⚖️ Legal status

As checked against the current CITES Checklist, CITES Appendices, and EU wildlife-trade references on 2026-06-03, no current CITES listing or specific EU Annex listing was found for Aphonopelma seemanni. The taxon is not relevant to the Bern Convention because it is not native to Europe.

Local and national rules on collection, export, import, sale, transport, exhibition, breeding, and proof of legal origin may still apply. Keep invoices, breeder details, and import or transfer paperwork where relevant; a non-listed trade status is not proof that every animal was sourced legally.

🤌 Husbandry

Aphonopelma seemanni should be housed alone. It is a solitary terrestrial tarantula and does not need or benefit from company.

Use small secure containers for spiderlings, then upgrade gradually as the animal molts. Spiderlings should always have a starter burrow or tight hide and prey small enough to find easily.

For adults, a low enclosure with 12-18 cm of substrate is more useful than extra height. A cork bark starter hide partly buried into the substrate encourages a stable burrow and reduces frantic climbing.

Choose an enclosure whose internal height leaves only a modest gap above the substrate. An adult does not need a tall air space, and filling a tall tank halfway is often safer than leaving a hard fall zone. Side ventilation above the substrate helps exchange air without directing a drying draft into the retreat.

Build the setup around:

• low terrestrial enclosure
• deep shape-holding substrate
• partly buried hide
• fresh water dish
• secure lid with good ventilation

On arrival, place the spider near the prepared hide, close the enclosure, and give it several quiet days before offering food. Do not keep moving furnishings to make the animal visible. During routine work, service the water dish and remove prey remains from the side opposite the burrow entrance. Full substrate replacement is rarely needed unless there is contamination, persistent mold, flooding, or a pest problem.

💡 Lighting

No UVB or specialist light is required. A normal room day-night cycle is enough.

If plant or display lights are used, keep them weak and off the enclosure lid. Bright heat from above can dry the burrow entrance and push the spider deeper than necessary.

🌡 Heating and temperature

Use a practical daytime range of 22-26°C, with nights around 18-22°C. Stable room warmth is safer than lamps aimed at a small enclosure.

Avoid overheating. Deep-burrowing species use underground retreats to avoid extremes, so the terrarium should provide choices rather than one hot dry surface.

💧 Humidity and water

Aim for about 60-75% with a dry-to-moist gradient. Keep fresh water available, lightly overflow one corner when needed, and let the rest of the surface breathe.

The lower burrow zone can be slightly moister than the top. Constantly wet substrate can cause stale air, mites, and mold; chronic dryness can lead to dehydration and difficult molts.

Treat the percentage as a secondary check, not a reason to spray on a schedule. Condensation, a sour smell, and substrate that remains glossy-wet indicate too much water or too little ventilation. A dry surface above a slightly cool, cohesive lower layer is usually more useful than uniformly damp soil. Tiny spiderlings have less water reserve, so check their moisture zone more often without turning the cup into a sealed wet chamber.

🌿 Enclosure and decoration

Use compactable substrate such as coco fiber mixed with clean soil or clay. Press it enough that the hide edge and burrow entrance hold shape.

Avoid excessive height, loose rocks, and decor that blocks emergency access. A skittish spider may bolt during maintenance, so keep a catch cup ready and work slowly.

Build the starter burrow against one side if possible; this lets the keeper inspect part of the retreat without lifting the hide. Leave enough clear space around the water dish to remove and refill it without crossing the spider’s normal ambush position. Replace mesh lids when practical, because tarsal claws can snag in coarse mesh.

🪳 Feeding

Feed roaches, crickets, locusts where legal, and occasional worms. Juveniles can be fed small prey more often; adults usually do well on a suitable meal every 7-14 days.

Do not panic over fasting if the abdomen remains full and the spider has sealed the burrow. Remove uneaten prey promptly, especially in premolt and after a fresh molt.

Offer prey no larger than the spider’s abdomen and reduce frequency when the abdomen becomes disproportionately broad. Crush the head of burrowing mealworms or offer them in a smooth-sided dish so they cannot disappear into the retreat. After a molt, wait until the fangs have changed from pale or red to fully dark—usually several days for juveniles and a week or more for large adults—before feeding again.

🩺 Common problems

Common problems include collapsing burrows, over-wet substrate, dehydration, hair irritation, bolting during maintenance, and stress from repeated digging-out.

A closed burrow is normal for this species. Check water and enclosure conditions, but do not excavate unless there is a real emergency such as flooding, injury, or a feeder trapped with a molting spider.

A mature male may wander, climb, and refuse food even in an appropriate setup. Look for enlarged emboli on the pedipalps and, where present, tibial hooks before assuming the enclosure has failed. By contrast, a tightly curled posture, a markedly wrinkled abdomen, leaking hemolymph, or inability to stand is urgent. Move routine hazards away, provide easy access to water, and seek an exotics veterinarian or an experienced tarantula clinician rather than attempting improvised medication.

📌 Conclusion

Aphonopelma seemanni is best for keepers who like burrowing tarantulas and can accept a spider that may stay hidden. Success depends on deep substrate, calm maintenance, traceable sourcing, and resisting the urge to handle a nervous animal.

📚 Sources and further reading

• CITES Checklist and Appendices - legal-status references checked 2026-06-03
• EU wildlife trade regulations - legal-status references checked 2026-06-03
• Bern Convention appendices
• GBIF species backbone entry for Aphonopelma seemanni
• World Spider Catalog species entry
• Aphonopelma revision
• The Tarantula Collective: Aphonopelma seemanni care
• Tom’s Big Spiders: husbandry notes by species