Cyriocosmus giganteus
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Description
Cyriocosmus giganteus - Unique dwarf tarantula with striking contrast
Discover the giant dwarf tarantula, a fascinating evolutionary marvel from the Peruvian Amazon. Cyriocosmus giganteus is the largest known representative of dwarf tarantulas, combining compact dimensions with a spectacular, velvety contrast of deep black and copper. Its vigorous appetite, dynamic feeding response, and modest space requirements make it a true jewel in any terrarium collection.
- Giant dwarf format: Reaches 6-8 cm (2.4-3.1 in) in leg span, eliminating the observation challenges typical of smaller dwarf species.
- Striking coloration: Jet-black legs and abdomen paired with a rich copper carapace without transverse abdominal bands create an elegant, velvety aesthetic.
- Dynamic hunter: Lightning-fast feeding response and consistent appetite guarantee exciting observation during every feeding session.
- Docile temperament: Mild venom and a preference for retreat rather than aggression ensure safe, stress-free care.
| Scientific name | Cyriocosmus giganteus |
| Origin | Peru (Loreto region, Amazon basin) |
| Adult size | Female 3-4 cm (1.2-1.6 in) body length (6-8 cm / 2.4-3.1 in leg span), male 2.5-2.8 cm (1.0-1.1 in) |
| Temperature | 24-26°C (75-79°F) daytime, 21-23°C (70-73°F) nighttime |
| Humidity | 65-75% (moist lower substrate layers) |
| Enclosure type | Terrestrial or cube (target 20x20x20 cm / 8x8x8 in) |
| Substrate depth | 5-8 cm (2-3.1 in) of peat, coconut fiber, and binding clay |
| Temperament | Skittish, agile, secretive, prefers retreating into its burrow |
| Venom potency | Mild (comparable to a wasp sting) |
| Urticating setae | Type III (present on dorsal abdominal mirror) |
| Lifespan | Females 8-12 years, males 6-12 months after maturity |
| Care level | Easy / intermediate (requires care due to speed) |
| CITES status | Not restricted, no registration required |
Choosing your stage and initial steps
At Ants Invasion, we supply healthy specimens across various developmental stages, ranging from young spiderlings to well-established juveniles. Each life stage exhibits distinct dynamics and requires an appropriately sized starter enclosure. Young slings in stages L1-L3 impress with rapid development and allow you to observe their color transformation firsthand, whereas older juveniles already display their definitive adult coloration.
Step 1: Gentle temperature acclimatization - Upon receiving your package, keep the transport container at room temperature 20-22°C (68-72°F) without supplemental heat mats for 24 hours. Applying direct heat immediately after transit sharply spikes metabolism and induces unnecessary stress.
Step 2: Preparing the initial enclosure - Spiderlings in stages L1-L3 thrive best in small, well-ventilated vial enclosures or sauce cups with a layer of lightly dampened peat. Excessively large enclosures at this stage hinder hunting success and complicate monitoring molts.
Step 3: First meal post-transit - Offer your tarantula its first prey item only after 24 hours of rest, tailored to your selected stage. For small slings (L1-L3), a single lively Turkestan cockroach pinhead measuring 1-2 mm or a flightless fruit fly is optimal (young slings also readily take cut pieces of fresh larvae such as mealworm). For older juveniles and adults, offer a feeder insect sized to roughly half their abdomen length.
Step 4: Permanent habitat for juveniles and adults - As your spider molts into advanced stages, transfer it into a larger terrarium with a deep substrate layer and a secure hiding spot such as natural cork bark.
What terrarium and substrate setup for Cyriocosmus giganteus on arrival?
For an adult Cyriocosmus giganteus, a terrestrial terrarium measuring 20x20x20 cm (8x8x8 in) with efficient cross-ventilation is ideal. A generous substrate depth of 5-8 cm (2-3.1 in) is vital, as it stimulates natural burrowing behaviors and maintains consistent moisture levels throughout the lower profile.
In its natural habitat across the lowland rainforests of Loreto, Peru, this species constructs retreats beneath fallen logs and buttress roots. In captivity, a blend of acidic peat, coconut fiber, and fine clay works best, preventing tunnels from collapsing. Incorporating natural sphagnum moss significantly enhances moisture buffering capacity.
Rather than misting the entire enclosure surface, pour water directly into one corner using a precise plastic pipette. Water seeps into the lower substrate layers while the top surface in the opposite area stays semi-dry, creating an essential moisture gradient. A shallow water dish should always be available without sponges or cotton.
What and how often to feed Cyriocosmus giganteus?
The diet of Cyriocosmus giganteus consists of live feeder insects matched to the spider size. As a general rule, feeder prey length should measure between 50% and 100% of the spider abdomen length. Feed young spiderlings every 3-5 days, while adults require feeding every 7-10 days.
Young slings in stages L1-L3 possess substantial appetites and feed enthusiastically on small running insects. Flightless fruit flies such as smaller Drosophila melanogaster or larger Drosophila hydei are excellent staples. Slings also hunt freshly hatched cockroach nymphs and accept pre-killed food items, eliminating any injury risk to delicate spiders.
As the spider grows, transition to larger feeders such as young Turkestan cockroaches, small crickets, and small Dubia roaches. Place prey near the burrow entrance. Monitor abdomen volume to avoid obesity. Any uneaten live prey must be removed after 24 hours, especially if the spider is preparing to molt.
Common mistakes and how to avoid them
- Stagnant humid air: Inadequate cross-ventilation combined with heavy surface spraying leads to mold proliferation. Ensure active air circulation and moisten lower substrate depths rather than misting enclosure walls.
- Desiccation of bottom layers: Slings in stages L1-L3 cannot tolerate completely dry conditions. Periodically add water droplets into one corner to keep the deep substrate damp.
- Leaving live feeders during molting: Before ecdysis, tarantulas seal their burrows and remain defenseless. Uneaten feeder insects can bite and fatally injure a molting spider.
- Handling without proper tools: The giant dwarf moves rapidly. Perform enclosure maintenance and feeding using 25-30 cm tweezers, avoiding sudden air disturbances.
- Attempting direct handling: Startled spiders easily jump. A fall from even modest heights can rupture the fragile abdomen, resulting in fatal hemolymph loss.
Discovery, taxonomic revision, and diagnostic features
Cyriocosmus giganteus was formally described in 2016 by Czech arachnologist Radan Kaderka in the Journal of Natural History. The male holotype was collected near the Quebrada Blanco Biological Station in the Loreto department of Peru. The species was initially known exclusively from male specimens until Kaderka published a 2019 generic revision featuring the first description of the adult female.
Phylogenetically positioned within the Theraphosinae subfamily and Hapalopini tribe, this species is distinguished from Cyriocosmus elegans by the complete absence of transverse light lateral stripes on the abdomen and an evenly dark velvety abdominal pattern with a central mirror patch. Males feature a distinct paraembolic apophysis on the palpal bulb, while females possess paired spiral spermathecae with spherical receptacles.
Is the venom of Cyriocosmus giganteus dangerous to humans?
Venom potency in this species is very mild and poses no health hazard to a healthy adult. Mechanical bites typically produce localized redness and minor discomfort similar to a bee or wasp sting. When threatened, the spider prioritizes immediate retreat into its burrow, resorting to defense only when physically pinned.
Does this species require CITES registration or official paperwork?
No. Cyriocosmus giganteus is not listed under CITES appendices or European Union wildlife protection annexes. Purchasing, keeping, and breeding this tarantula within Poland and the European Union is entirely legal and requires no district office registry filings or captive-bred certificates.
Which enclosure sizes to choose for each developmental stage?
Spiderlings in stages L1-L3 thrive in ventilated 25-50 ml vials or sauce cups with damp substrate. Juveniles in stages L4-L7 do well in braplast containers measuring 10x10x10 cm or 15x15x15 cm. The final terrarium for an adult spider should measure 20x20x20 cm with deep burrowing substrate and a flat piece of cork bark as a retreat roof.
Looking for a rare tarantula with stunning aesthetics and compact proportions? Choose your preferred stage from the options list, select feeder insects and accessories, and enjoy observing this Peruvian giant dwarf thrive in your care.
Shipping and live arrival guarantee
During cold weather, every parcel is safeguarded with a professional HeatPack warmer to maintain proper temperatures in transit.
Live animals are dispatched exclusively Monday through Thursday, eliminating any risk of packages idling in courier sorting hubs over weekends.
We take complete responsibility for transit safety. We guarantee that your spider arrives healthy and in perfect condition.
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