Hapalopus formosus

🔤 Taxonomy

Hapalopus formosus is the currently accepted scientific name. GBIF lists Hapalopus magdalena as a synonym, and WSC also links older Typhochlaena and Avicularia combinations from the Colombian material.

Hobby animals are often sold as pumpkin patch tarantulas or Hapalopus sp. “Colombia.” Keep breeder line information because trade labels, size forms, and old names are easy to mix.

The familiar large and small pumpkin-patch forms in captivity have not always been tied securely to examined H. formosus material. A seller label is therefore not proof of identity. Keep those forms separate, avoid relabelling descendants as confirmed H. formosus, and record exactly what was received.

Older names and combinations associated with the species include:

• Hapalopus magdalena
• Typhochlaena magdalena
• Avicularia magdalenae

English common names used in the hobby:

• pumpkin patch tarantula
• Colombian pumpkin patch
• Hapalopus sp. Colombia

📌 Description

Hapalopus formosus is a small to medium New World tarantula known for orange-black patterning, quick growth, and a habit of webbing around a shallow retreat.

Adults are usually around 7-10 cm legspan, depending on line and sex. The species is often visible but can bolt quickly, especially when small or freshly rehoused.

It is attractive and not usually regarded as medically significant, but it is still a tarantula with urticating hairs and fast escape potential. It should be maintained hands-off.

Its compact size hides a strong feeding response and rapid development. A sling can outgrow a tiny vial quickly, yet moving it into an oversized box makes moisture, prey recovery, and escape control harder. Prepare staged housing rather than choosing one enclosure for life.

🌍 Distribution

World Spider Catalog lists Hapalopus formosus from Colombia. For care, use a humid but breathable terrestrial-fossorial setup with a secure retreat and enough substrate to hold a small tunnel.

The keeper’s job is to provide choices: damp lower substrate, dry webbed entrance, water for larger juveniles and adults, and enough airflow that the enclosure does not sour.

🌡 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 Hapalopus formosus. The species 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, import or transfer paperwork where relevant, and avoid animals with unclear wild-collection stories.

🤌 Husbandry

House this species alone. It is small enough to use gaps that would be harmless for a larger tarantula, so inspect ventilation and lid edges before adding the animal.

Spiderlings need small containers where prey and hydration can be controlled. Adults can use a compact enclosure with a cork hide, substrate depth, and room for a webbed retreat.

Build the setup around:

• 8-10 cm of shape-holding substrate
• small cork hide or starter burrow
• leaf litter or moss for web anchors
• water dish for larger juveniles and adults
• fine escape-proof ventilation

An adult around 8-10 cm legspan can use a low enclosure near 25 x 20 x 20 cm, adjusted to the actual line and specimen. Press the substrate so a starter tunnel will hold, angle cork partly into it, and leave several centimetres above the webbing for safe access. More height is not useful for a terrestrial spider.

Quarantine new arrivals away from the collection and use separate tools. Keep a simple log of prey, molts, water additions, and whether the retreat remains open. This is particularly valuable when the animal arrived under an ambiguous hobby label.

Before rehousing, place both enclosures in a larger clear tub and block other escape routes. Guide the spider toward the new starter burrow with a soft brush. Never try to catch a small bolt with fingers; it is easier to injure or lose than a large terrestrial tarantula.

💡 Lighting

No UVB or specialist basking lamp is required. A normal room day-night rhythm is enough, and any display light should stay weak enough that it does not overheat or dry the retreat.

🌡 Heating and temperature

Keep daytime temperatures around 22-26°C, with a modest night drop around 20-22°C. Stable room warmth is safer than a lamp aimed at a small enclosure.

Avoid temperature spikes. Tarantulas often tolerate a cool night better than a hot, dry enclosure, and small containers can overheat quickly on racks, windowsills, or shelves near radiators.

💧 Humidity and water

Keep the lower substrate lightly moist and the surface ventilated. The spider should be able to retreat to humidity without being forced to sit on soaked substrate.

Mold and mites appear quickly in small humid enclosures when prey remains are ignored. Remove leftovers and avoid overfilling the water area.

Judge moisture by the substrate, not by forcing a fixed humidity number. Keep a darker, slightly damp band below the surface while allowing the webbed entrance to dry. Add water down one side rather than spraying the whole web. If condensation persists, increase air exchange and delay the next watering.

🌿 Enclosure and decoration

A simple terrestrial enclosure works best: low height, clear access, a secure lid, and enough structure for webbing. Heavy decoration makes maintenance harder and can crush tunnels.

The species may web heavily around cork and leaves. Leave that architecture in place; rebuilding the enclosure repeatedly makes the spider less secure.

Avoid fertilized potting soil, scented products, loose stones, and fine wire mesh that can catch claws. Leaf litter and small pieces of dry moss make useful anchors, but do not pack so much material into the enclosure that uneaten prey and molts cannot be found.

🪳 Feeding

Feed small crickets, roaches, fruit flies for tiny spiderlings, or cut prey where needed. Juveniles often feed well every few days; adults usually do well every 5-10 days.

Use prey smaller than the spider can subdue safely. Remove live prey before molt and remove old food remains from webbing before mold develops.

Tiny slings can scavenge freshly killed cricket or roach pieces, which should be removed the next day. As the spider grows, offer one prey item around half to two-thirds of its legspan and adjust frequency to abdomen condition. A sealed burrow and feeding refusal usually indicate premolt; keep water available and wait. Resume only after the new fangs have darkened.

🩺 Common problems

Common problems include desiccated spiderlings, soggy substrate, escape through lid gaps, missed molts in webbed retreats, and mites from old prey remains.

A sealed retreat usually means the spider is settling, molting, or avoiding disturbance. Do not dig it out unless the enclosure itself has become unsafe.

Other warning signs include a persistently shrunken abdomen, weak or curled posture, repeated wall climbing in a wet setup, and a bad smell from hidden remains. A spider on its back is normally molting. Do not flip or feed it. Injury, leaking hemolymph, severe dehydration, or a failed molt needs minimal disturbance and experienced exotics-veterinary advice where available.

📌 Conclusion

Hapalopus formosus is a good choice for keepers who enjoy small humid webbing species and can manage tiny prey, moisture, and escape prevention. It is colorful, but its care depends on details.

📚 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 Hapalopus formosus
• World Spider Catalog species entry
• Tom’s Big Spiders: pumpkin patch husbandry notes (hobby Hapalopus sp. Colombia context, not proof of species identity)
• The Tarantula Collective: pumpkin patch care sheet (hobby-line context)