Grammostola quirogai (Uruguayan Black Beauty)
Welcome to the world of Eight Legged Beauties, where we turn fuzzy fear into fascination!
Today we're turning the spotlight on one of the hobby's most beautiful and famously calm tarantulas — Grammostola quirogai, commonly known as the Uruguayan Black Tarantula or Uruguayan Black Beauty. With its deep, velvety-black coloration, slow-growing nature, and generally laid-back personality, this species is a fantastic example of why tarantulas don't have to be scary — sometimes they're just fuzzy little introverts who would rather be left alone.
G. quirogai is also a species with an interesting taxonomic history. For years, black Grammostola from Uruguay were often confused with other species, particularly G. pulchra. Scientific work eventually recognized the Uruguayan black form as its own species, Grammostola quirogai.
Meet the Species
Scientific name: Grammostola quirogai
Common name: Uruguayan Black Tarantula, Uruguayan Black Beauty
Type: Terrestrial / opportunistic burrower
Native to: Uruguay and nearby areas of northeastern Argentina
Adult size: ~6–7″ diagonal leg span
Temperament: Generally calm and docile; may retreat, flee, or kick urticating hairs when significantly disturbed
Lifespan: Females can live for decades; males have a considerably shorter adult lifespan after maturity
Growth rate: Slow
Experience level: Beginner
Fun Fact:
Grammostola quirogai was formally described as a species in 2015 after researchers determined that the black form historically associated with G. anthracina represented a distinct species. The species name quirogai honors Uruguayan writer Horacio Quiroga, who was born in Salto, Uruguay.
Despite being commonly called a "black tarantula," this species can have a beautiful velvety appearance, especially after a fresh molt.
Setting Up Their Home
In the wild, G. quirogai is a terrestrial species associated with the temperate grassland and scrub environments of Uruguay and surrounding regions. It is best kept as a terrestrial tarantula with enough substrate to allow it to dig or modify a retreat if it chooses to.
Enclosure Tips
• For spiderlings: Use a small terrestrial enclosure that allows easy access to prey while providing enough substrate for a secure retreat.
• For juveniles: Upgrade gradually into a terrestrial enclosure with approximately 3–4× the tarantula's leg span in usable floor space.
• For adults: A horizontally oriented enclosure around 10–12″ × 10–12″ is a good starting point, with additional floor space welcomed when practical.
• Orientation: Wider than tall — this is a terrestrial species, and excessive height creates unnecessary fall risk.
• Security: Use a secure lid and good ventilation. Even calm tarantulas can move surprisingly quickly when startled.
Substrate
Use several inches of:
Organic topsoil / Terra Aranea or another tarantula-safe substrate
Firmly packed enough to support shallow burrows and retreats
Mostly dry substrate with the ability to provide a slightly more humid area
Provide a cork-bark hide, partially buried piece of bark, or another secure retreat. A shallow water dish should always be available.
Although G. quirogai can tolerate moderate humidity, constantly wet substrate is unnecessary and should be avoided. A moisture gradient and good ventilation are much more useful than trying to maintain a constantly high humidity enclosure.
Temperature & Humidity
Setting | Ideal Range | Tips
Temperature: 72–80°F — Normal household temperatures are generally suitable. A modest nighttime drop is completely fine.
Humidity: Moderate — Aim for a moisture gradient rather than keeping the entire enclosure damp.
Ventilation: Good — Cross-ventilation helps prevent stagnant air and overly wet substrate.
Pro Tip:
Don't stress about maintaining an exact humidity percentage. A full water dish, dry-to-moderately moist substrate, and good ventilation will generally provide the tarantula with the choices it needs.
Allow the enclosure to dry between waterings rather than keeping the substrate constantly saturated.
Feeding Time
Spiderlings
Feed 2–3× per week
Small roach nymphs, pinhead crickets, fruit flies, or appropriately sized prey
Remove uneaten prey if the sling doesn't take it
Juveniles
Feed approximately every 5–10 days
Appropriately sized crickets or roaches
Adjust feeding based on growth and abdomen size
Adults
Feed approximately every 1–2 weeks
Crickets, Dubia roaches, or other appropriately sized feeder insects
Adjust feeding based on appetite, activity, growth, and abdomen size
Tip:
G. quirogai is a slow-growing species, so don't feel like you need to constantly feed in an attempt to speed things up. A healthy tarantula does not need to eat every time food is offered.
A reasonably rounded abdomen is generally a good indication that your tarantula is well fed. Avoid allowing the abdomen to become excessively large.
After a molt, always wait until the fangs are fully hardened and dark before offering food. For adults, this may take several days or longer.
Behavior & Temperament
• Spiderlings: Often shy and may spend a lot of time hiding or digging.
• Juveniles: Usually calm but may become skittish when disturbed.
• Adults: Generally slow-moving and docile, making them excellent display animals.
• Defense: Like other New World tarantulas, they possess urticating hairs and may use them if they feel threatened.
• Handling: Not recommended. Even a very calm tarantula can bolt or fall, and a fall can be dangerous for the spider.
Observation tip:
One of the best things about G. quirogai is that you don't need to see it constantly for it to be thriving. If yours disappears into its hide or spends time sitting quietly, that's completely normal.
Watch for normal signs of activity such as feeding, occasional wandering, digging, webbing, or repositioning substrate.
Common Challenges
Being patient with their slow growth rate
Avoiding the temptation to overfeed
Maintaining appropriate moisture without keeping the enclosure constantly wet
Providing enough substrate for digging and retreat construction
Managing their long-term lifespan commitment
Remembering that "docile" does not mean "safe to handle"
Properly identifying the species, since G. quirogai is frequently confused with visually similar black Grammostola, particularly G. pulchra
Final Thoughts
Grammostola quirogai — the Uruguayan Black Tarantula — is a beautiful, slow-growing, long-lived New World species that has earned its reputation as one of the more beginner-friendly tarantulas in the hobby.
With its deep black coloration, calm personality, and relatively straightforward care requirements, it's easy to understand why this species is so popular.
The biggest challenge isn't complicated husbandry — it's patience. G. quirogai grows slowly and can spend long periods simply existing in its enclosure, doing absolutely nothing that we can see. And honestly? That's part of the charm.
Give it a secure terrestrial enclosure, appropriate substrate, access to clean water, good ventilation, and plenty of privacy, and you'll have a gorgeous tarantula that can potentially be part of your collection for decades.
And remember: if you see black Grammostola listed as G. pulchra, G. anthracina, or simply "Brazilian Black" or "Uruguayan Black," don't assume the names are interchangeable. G. quirogai is a distinct species, and accurate locality and breeder records can be especially important when identifying these very similar-looking tarantulas.
Ashley Boyle