The Brazilian Whiteknee Tarantula: What You Should Know

The Brazilian Whiteknee Tarantula (Acanthoscurria geniculata), sometimes called the Giant White Knee, is a large tarantula from Brazil’s rainforest habitat, best known for the bright white bands on its legs. They were, or are, one of the more popular Tarantula species being kept in captivity today.  This particular spider species is generally thought of for the more advanced keeper as they are known as being somewhat skittish and can be defensive if provoked.  They will not run and hide like some other species, such as the Chilean Rose Hair, will do when threatened. While many tarantulas prefer to hide when disturbed, such as the Chilean Rose Hair, the Brazilian Whiteknee often stands its ground, so calm, minimal handling and a secure setup are key.

Size and Growth

Brazilian Whiteknee are a larger species reaching 8 ” in total size in females. Males are smaller. As Spiderlings, or slings as they are commonly known in arachnoculture, they tend to burrow to feel comfortable. This behaviour changes as they grow and mature; it’s as if they become aware of their size and are more apt to spend time away from their hides and in the open of the enclosure making them a great display species.

Temperament and Safety

While their venom is one that most would consider mild, and they are not as quick to bite as some of the other species of tarantula, I would still treat this spider with respect and err on the side of caution just the same when in their tank.

Housing and Care Basics

Keeping the Brazilian White Knee tarantula is not a hard task. They can be kept in a glass terrarium with a substrate of coco fibre, bark, or Spider Life Substrate, mixed with moss. A depth of around 4” will keep the humidity at the 65-70% needed for proper moulting and general care. Heat should be around 75 to 80 degrees Fahrenheit and can be achieved with a small heat mat. Water should be offered in a shallow dish and to this we add pebbles in order to keep any uneaten crickets from drowning and fouling the water source. Once a month remove all the substrate and clean the enclosure with a suitable disinfectant. A hide of some type should always be provided and should either be a half log, or my personal favourite, a used toilet paper tube that is buried within the substrate itself.

Wrapping Up

Overall, the Brazilian Whiteknee is a standout world species for experienced keepers who want a bold, large size tarantula with an impressive leg span and plenty of visible behaviour, from burrowing retreats when young to confident, out-in-the-open prowling as it matures. It’s native to Brazil and, like many tarantulas, is characterized by a clear defence display (including urticating hairs), so it’s best admired with respect. Set up right, feed appropriately, and you’ll have a striking centrepiece for any collection.

Note from Gary: pictures do not do Brazilian Whiteknee Tarantulas justice. Find out if your local herp store has them in, and go for a look. To avoid disappointment, don’t forget your wallet!

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