Ceratogyrus darlingi (Rear-Horned Baboon)
Last updated: May 8, 2026
Ceratogyrus darlingi, the Rear-Horned Baboon, is immediately recognizable by the distinct foveal protuberance on its carapace: a hardened, horn-like growth that has no real parallel in most other tarantulas commonly kept in the hobby. It is a strange and interesting-looking spider even before you get into its behavior.
The species is from Southern Africa, found across Botswana, Zimbabwe, and parts of South Africa. It is a fossorial old world tarantula, meaning it burrows and, like all old world species, has no urticating hairs. It reaches around 4 to 5 inches in legspan and is a relatively fast-growing species for its size.
The Horn
The foveal protuberance on C. darlingi is one of the more prominent examples in the Ceratogyrus genus. Its exact function is not fully understood, though there are various hypotheses about structural reinforcement and sensory function. What is certain is that people will notice it and ask about it. If you keep this spider, plan on fielding questions. It is that unusual-looking.
What It's Like to Keep
This is an old world tarantula, which means you should approach it differently than you would approach even a defensive new world. There are no urticating hairs to kick, so its defenses are speed, a threat display, and the willingness to bite. The venom is more significant than what you would encounter from a typical new world species, and while it is not considered medically dangerous for most healthy adults, a bite is a real event worth avoiding.
It burrowers readily, which means it will spend time out of sight, but when it is out it is an interesting spider to observe. It is not the most defensive old world you will encounter in the hobby, but it is absolutely an animal you need to approach with respect and deliberateness.
Is This a Good Fit for You?
If you have some experience with old world tarantulas or at least with defensive new world species and want to add something genuinely unusual to your collection, C. darlingi is a fascinating choice. It is distinctive in appearance, interesting in behavior, and an excellent representative of the old world African burrowing spiders that deserve more attention in the hobby.
If you are new to old world tarantulas and want to start with one, there may be more forgiving starting points. The Ceratogyrus genus in general tends toward defensive. That said, it is not among the most extreme old world species available, and an intermediate keeper who does their research and prepares properly can manage it well.
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FAQs
What is the horn on Ceratogyrus darlingi?
It is a foveal protuberance, an extension of the fovea (the central groove on the carapace). It is present in all Ceratogyrus species to varying degrees, with C. darlingi having one of the more prominent examples. Its exact function is not fully understood, but it is entirely natural and not a sign of any health issue.
Does Ceratogyrus darlingi have urticating hairs?
No. As an old world species it has no urticating setae. Its defense is speed, threat displays, and biting. This is one of the key differences between old world and new world tarantulas that affects how you approach their husbandry.
Is Ceratogyrus darlingi good for beginners?
I would not recommend it for a complete beginner. It is best suited to keepers who have experience with defensive species and understand what to expect from an old world. That said, it is not among the most defensive old worlds available in the hobby, and an intermediate keeper who takes the time to prepare properly can manage it well.
How much space does Ceratogyrus darlingi need?
It is a burrowing species, so depth of substrate matters more than footprint. An enclosure slightly larger than the spider's legspan in footprint with 3 to 4 inches of substrate depth is a reasonable starting point for a juvenile, scaled up appropriately as the spider grows.