Brazilian Wandering Spider

The wandering spiders is a term used to refer to the spider family Ctenidae. Previously, the term referred only to the genus Phoneutria but now usually refers to the entire family Ctenidae. The members of the genus Phoneutria are highly aggressive and venomous nocturnal hunters, and are the only wandering spiders known to pose a serious danger to humans. However, the venom of some other members of this family is very poorly known, meaning that all larger Ctenids should be treated with caution. Ctenids have a distinctive longitudinal groove on the top-rear of their oval carapace[1] (some other spiders have a similar groove; e.g., Amaurobiidae).