Grammostola grossa (Guarani Giant Tarantula) 2-2.5"

Grammostola grossa (Guarani Giant Tarantula)

The Guarani Giant, or Grammostola grossa, is a terrestrial tarantula from Brazil, Paraguay, Uruguay, and Argentina. Adults of this species have a deep, almost black coloration dusted with a fine silver hue throughout, creating a beautiful high contrast coloration all its own. Even as spiderlings, it carries the same dark, fuzzy look as its cousins Grammostola actaeon and Grammostola iheringi, though grossa never develops their signature red abdomen, staying an even silver-dusted black instead. Spiderlings do not start out colorful and the adult colors come in around 2 to 2.5 inches, while the species only grows to about 7 inches in diagonal leg span. Like others in the genus, this species has a very long lifespan, with females reaching about 20 to 30 years while males live 3 to 5 years. This species is also very calm and forgiving, and one we recommend for beginner keepers or anyone who wants an easier keeping experience. Grab this docile new world tarantula for sale today, offered here as a juvenile.

Why do hobbyists keep Grammostola grossa?

• Stunning Coloration: A deep, almost black body dusted with fine silver hairs, a frosted look that stands apart from other dark Grammostola species.
• Fluffy Appearance: Both slings and adults carry a noticeably fuzzy coat, a softer, less intimidating look than most Grammostola.
• Large Size: One of the larger Grammostola species in the hobby, reaching about 7 inches at full leg span.
• Fast Grower: Hatches out unusually large, nearly an inch in leg span, giving it a head start that carries through to a quicker climb to full size.
• Great Beginner Species: Fast growth aside, this genus has a strong track record with keepers who start from a spiderling, forgiving enough that the ordinary early slip-ups rarely set the animal back.
• Rare in the Hobby: Not often available and quick to sell out when it is.

How should Grammostola grossa be kept?

• Adult Size: Hatches at around 0.5 to 0.75 inch and reaches about 7 inches at full leg span, one of the larger Grammostola species in the hobby.
• Enclosure: Provide roughly 3 to 4 times the leg span as footprint and 2 times the leg span as height, with substrate at least as deep as the leg span. For this size, that means starting around 7.5 to 10 by 7.5 to 10 by 5 inches, with substrate around 2.5 inches deep, sizing up as it grows.
• Rehousing: Expect one more move on the way to full size, lasting roughly 6 to 8 months at this species' fast growth rate before the final enclosure.
• Temperature: Keep between 65 to 75 degrees F.
• Humidity: Maintain a moisture gradient with a slightly damp lower layer and a drier surface, similar to a morning dew cycle in the wild. Good ventilation is critical.
• Water: A shallow textured water dish works well, something they can grip when climbing out.
• Diet: Feed crickets or roaches around 5/8 inch, matched to the carapace (head). Feed at least once a week.
• Temperament: Calm and easygoing, a great pick for beginners who want a docile, low-key display animal that grows quickly.

Are there any additional notes or considerations for Grammostola grossa?

• Captive Bred: All tarantulas at Exotics Unlimited are captive bred.

Frequently asked questions about Grammostola grossa

• Is the silver-dusted coloration coming in at this size? Yes, this is right around the size where it starts showing, so expect to see the frosted black look actively developing.
• Is this a good size to skip the earliest, most delicate stage? Yes. At this size the animal is well past the earliest spiderling stretch, with the silver-dusted coloration underway and full size not far off thanks to its fast growth rate.

Looking for similar species?

• Browse our New World Tarantulas and Terrestrial Tarantulas collections to explore related care profiles and species groupings.

Listing Notes

• This listing is for a Grammostola grossa Guarani Giant Tarantula juvenile measuring around 2 to 2.5 inches in diagonal leg span, which is the size given in the title, unsexed, with roughly a 50/50 chance of male or female. The silver-dusted adult coloration is right around the size where it starts coming in, so this is a great size to watch that change happen.
• Looking for other sizes? This species is also available as 0.75-1" Spiderling, 1-1.25" Spiderling, or 2.5-3" Juvenile.