Phormictopus atrichomatus
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Description
Phormictopus atrichomatus - Red Island Birdeater with an impressive appetite
Are you looking for a spider that proudly patrols its enclosure and hunts spectacularly in full view, rather than disappearing into a deep underground burrow for months? Phormictopus atrichomatus (Red Island Birdeater) is a Caribbean aristocrat combining the striking metallic blue of young spiderlings with the monumental size and velvety ebony of adult specimens. It is famous for its outstanding growth rate, constant presence out in the open, and a legendary, voracious appetite that turns every feeding into an exciting spectacle.
- No more empty terrarium: An exceptionally confident species that, unlike many terrestrial tarantulas, constantly stays out in the open and reacts to its surroundings.
- Spectacular color ontogeny: Young spiderlings dazzle with metallic blue, which evolves with growth into elegant, deep mahogany and ebony with a copper sheen.
- Rapid growth rate: One of the fastest growing New World tarantulas, noticeably gaining mass and leg span with every molt.
- Monumental adult size: Adult females reach 7-9 cm body length and 18-23 cm leg span, making them an undisputed highlight of any collection.
| Scientific name | Phormictopus atrichomatus |
| Common name | Red Island Birdeater |
| Origin | Hispaniola (Dominican Republic, Haiti) |
| Natural habitat | Humid tropical lowland forests, river valleys, and karst formations |
| Lifestyle | Terrestrial, display-active, opportunistically burrowing |
| Adult female size | Body 7-9 cm, leg span 18-23 cm |
| Adult male size | Body 5-6.5 cm, leg span 17-20 cm |
| Growth rate | Very fast (rapid biomass increase between molts) |
| Lifespan | Females 15-25 years, males 4-6 years (1.5-2 years after ultimate molt) |
| Daytime temperature | 24-28°C (75-82°F) |
| Nighttime temperature | 20-23°C (68-73°F) (natural nighttime drop) |
| Relative humidity | 70-80% (moisture gradient in substrate) |
| Target enclosure | Minimum 35x30x25 cm, optimal 40x30x30 cm (horizontal setup) |
| Substrate depth | 8-15 cm (mix of peat moss, coconut fiber, and vermiculite) |
| Defensive apparatus | Type I and III urticating setae on abdomen, stridulatory apparatus |
| Venom potency | Mild to moderate (comparable to a wasp sting) |
| Difficulty level | For everyone using feeding tongs (dynamic species with strong feeding response) |
| Legal status | Non-CITES, no registration required |
Choosing an Instar and First Steps After Arrival
Depending on the currently selected option from the drop-down list above, you can tailor your choice to your keeping goals. Young L1-L3 spiderlings arrive in ventilated vials with moistened substrate and are the ideal choice for keepers who want to watch the stunning transformation from metallic blue from scratch. L4-L8 juveniles are the most popular choice, offering maximum hardiness, displaying their first adult colors, and feeding completely independently. Adult specimens provide an immediate, monumental presence in the display terrarium. Regardless of the chosen stage, the first steps after unboxing follow a proven procedure:
Step 1: Calm thermal acclimation - After unboxing, leave the closed transport container at room temperature 20-22°C (68-71°F) for 24 hours. Strictly avoid direct heating with heat mats or lamps, allowing the spider to settle transport stress without abruptly accelerating its metabolism.
Step 2: Safe transfer to enclosure - Open the transport container inside the target terrarium or a larger safety catch tub. Let the spider walk out on its own onto the prepared, slightly damp substrate near its hide. Ensure constant access to a shallow dish with fresh water.
Step 3: First meal after transport - Offer the first feeder insect only after 24 hours in the new enclosure. For spiderlings, choose a single active hatchling roach sized 50-100% of the spider's abdomen length, and for adults, a grown roach.
What Enclosure and Conditions to Prepare for Phormictopus atrichomatus?
For an adult specimen, the optimal setup is a horizontal terrarium measuring 40x30x30 cm with a deep 8-15 cm substrate layer and effective cross-ventilation. The height of the open space above the substrate should not exceed 15-20 cm, protecting this heavy spider from dangerous falls. Provide a daytime temperature of 24-28°C (75-82°F) and 70-80% humidity with a distinct gradient.
The key to successful husbandry is maintaining safe enclosure proportions. Phormictopus atrichomatus is a heavy terrestrial tarantula, so a low terrarium profile eliminates the risk of fall injuries. A substrate mix of peat moss, coconut fiber, and bentonite clay allows the spider to satisfy its natural burrowing instincts and sculpt scrapes around its shelter. A sturdy piece of cork bark partially buried at an angle makes an ideal, mold-resistant hide.
Moisture management is based on a substrate humidity gradient. Regularly overflow water into one corner around the water dish so the bottom substrate layers remain consistently moist, while the top surface around the hide stays moderately dry. Ventilation holes on opposite walls provide continuous cross-ventilation, preventing stagnant, stuffy air that is fatal to Caribbean invertebrates.
What to Feed Phormictopus atrichomatus and How to Plan Its Diet?
The staple diet consists of live feeder insects sized 50-100% of the spider's abdomen length. Feed L1-L3 spiderlings 1-2 times a week with small roach nymphs, juveniles every 5-7 days with medium insects, and adult specimens every 10-14 days with large roaches or locusts. The spider drinks water from a stable dish.
This species stands out with a legendary appetite and an explosive feeding response to any moving prey. The most versatile and balanced feeders are live Turkish roaches, whose active movements instantly stimulate the spider's hunting instinct. For larger juveniles and adult females, Dubia roaches and adult locusts work well, and during rapid growth phases the diet can be supplemented with energy-rich mealworms.
In daily care, follow the simple visual rule of evaluating the abdomen, which in a well-nourished tarantula should resemble a smooth bird egg. The spider grows rapidly, but once adult size is reached, feed moderately to maintain a healthy body condition. Strictly avoid feeding vertebrates such as pinky mice, which foul the enclosure microclimate and strain the spider's digestive system.
How to Recognize Molting and Care for the Spider in Pre-Molt?
An approaching molt is signaled by decreased activity, a darkened and taut abdomen resembling a ripe grape, and weaving a dense molt mat. During this period, strictly remove all live feeder insects from the terrarium, slightly increase humidity, and avoid disturbance. After molting, wait 7-14 days before offering the first meal to allow the fangs to harden completely.
Entering the pre-molt phase is marked by food refusal and dulling of the carapace colors. Any bald mirror patch on the abdomen turns shiny and jet black as the new exoskeleton forms beneath the old skin. The tarantula often seals its hide entrance with silk and weaves a sturdy silk molt mat on the floor, on which it will turn onto its back to shed its exoskeleton.
During and immediately after molting, the spider requires complete quiet, and its new fangs are soft white with a rubbery consistency. Any feeder insects must be removed from the enclosure so they cannot harm or stress the vulnerable tarantula. Only when the fangs turn solid jet black and the exoskeleton has fully sclerotized can you safely offer the first nourishing meal.
Common Husbandry Mistakes and How to Avoid Them
- Enclosure too tall without sufficient substrate: Phormictopus atrichomatus is a heavy terrestrial tarantula. Keeping the free height above substrate to 15-20 cm and providing 8-15 cm of substrate effectively protects the spider from dangerous falls from glass walls.
- Lack of cross-ventilation and stagnant air: High humidity without airflow promotes mold growth. The enclosure must have clear ventilation vents on opposite walls to ensure cross-ventilation.
- Leaving live feeder insects during molting: While shedding its exoskeleton, the tarantula is completely defenseless. Always remove uneaten prey from the enclosure to ensure a safe molt.
- Attempting to handle the spider: Given its fast speed, active kicking of urticating setae, and formidable chelicerae, all maintenance and feeding should be performed strictly using 25-30 cm stainless steel feeding tongs.
Taxonomic status and biogeographical revision
The species Phormictopus atrichomatus was scientifically described in 1991 by German arachnologist Günter Schmidt based on an adult female holotype deposited in the Senckenberg Museum under catalog number SMF 37587. This specimen arrived in Europe accidentally in a banana shipment, leading Schmidt to mistakenly designate Honduras as the type locality in his original diagnosis. In older hobby literature and trade listings, the species was also incorrectly attributed to Cuba due to morphological similarity to the Cuban Phormictopus auratus. Modern revisions of type material and official records in the World Spider Catalog (WSC) have clarified these records. The natural distribution of this taxon is restricted strictly to the Caribbean island of Hispaniola, encompassing the Dominican Republic and Haiti, where it inhabits tropical lowland forests, river valleys, and karst formations.
Debunking the hairless myth and stridulatory apparatus
For years, a myth circulated in the hobby claiming that Phormictopus atrichomatus lacks urticating setae. This misconception stemmed from a literal translation of the Greek specific epithet (a- meaning without, and trichoma meaning hair). In reality, the holotype examined by Schmidt had likely kicked off all its urticating hairs during the long, stressful voyage in a cargo ship hold. Morphological studies clearly demonstrate that this tarantula possesses a fully developed defense mechanism of Type I and III urticating setae on its abdomen, which it actively kicks with its hind legs when disturbed. Furthermore, representatives of the genus Phormictopus possess a stridulatory apparatus located on the coxae and trochanters of the pedipalps and first pair of legs, producing audible warning hisses before striking.
Frequently Asked Questions (FAQ)
Is Phormictopus atrichomatus venom dangerous to humans?
The venom of this species contains no dangerous neurotoxins and is toxicologically rated as mild to moderate. Its effect is comparable to a typical wasp or bee sting, causing mainly localized burning and redness. Basic caution and using long feeding tongs during maintenance completely eliminate any bite risk.
How to safely work inside the terrarium and can this spider be handled?
Phormictopus atrichomatus is a fast and defensive terrestrial tarantula, which is why we follow a look-but-do-not-handle approach. Use 25-30 cm feeding tongs for feeding, water refills, and maintenance. When rehousing into a larger enclosure, the cup method using a clear catch cup provides complete safety and peace of mind.
Does this species require CITES permits or official registration?
No. Phormictopus atrichomatus is not listed under CITES appendices or EU wildlife annexes. Buying and keeping this tarantula is completely legal, requiring no CITES documents or local authority registrations.
When does the metallic blue of spiderlings change into adult coloration?
Spiderlings from L1 up to roughly L4-L5 display intense metallic blue and steel-navy across their entire body. Over subsequent molts, blue tones gradually give way to gray and copper shades. Between L6 and L8, the tarantula transitions to mature adult coloration: a deep chocolate or ebony body with mahogany setae on the abdomen and a copper-purple sheen on the carapace.
Looking for a majestic spider that stays out in the open and hunts spectacularly instead of hiding underground? Choose an L1-L3 spiderling to watch the fascinating color ontogeny, or pick an L4-L8 juvenile for immediate display presence. Add Phormictopus atrichomatus to your cart and enjoy one of the most impressive Caribbean giants in your collection!
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