Brazilian wandering spiders, like their name says, are active hunters and travel a lot.

On the other hand, the Brazilian wandering spider requires very little provocation.

Unlike many types, the Brazilian wandering spider is not reluctant to attack people who appear threatening.

Priapism is also known to occur from bites of the Brazilian wandering spider.

Because they are not very large, they are much harder to detect than a large Brazilian wandering spider or a tarantula.

Tx2-6 is a toxin found in the venom of the Brazilian wandering spider, Phoneutria nigriventer (Keys).

The Brazilian wandering spiders appear in Guinness World Records from 2010 as the world's most venomous spider.

The spider-bites documented as the most dangerous to humans are those of the Sydney funnel-web spider and the Brazilian wandering spider.

Unlike the Brazilian wandering spider, which is alleged to occasionally deliver dry bites, these spiders typically deliver a full envenomation when they bite.

Guinness World Records states that although the Brazilian wandering spider is the most toxic, an effective antivenom is available and few fatalities occur.

The Brazilian wandering spider (a ctenid spider) is a large brown spider similar to North American wolf spiders in appearance, although somewhat larger.

Currently, it is known to naturally occur only in the venom of the spider Phoneutria nigriventer, also known as the Brazilian Wandering spider.

Tx2-6 A study done at the Medical College of Georgia has found that venom from the Brazilian wandering spider contains a toxin, called Tx2-6, that causes erections.

When he hears the lyric about the "deadly black taranch-la" [actually the highly venomous Brazilian wandering spider or banana spider], the beatnik protests, "Don't sing about spiders, man!

In this one-hour show, he encounters a Brazilian wandering spider in French Guyana and describes it as "the most dangerous spider in the world," with "venom about 18 times more deadly than that of the black widow."

The venom of Brazilian wandering spiders is also a potent neurotoxin, which attacks multiple types of ion channels In addition, the venom contains high levels of serotonin, making an envenomation by this species particularly painful.

In the case of bites by widow spiders, Australian venomous funnel-web spiders, or Brazilian wandering spiders, prompt medical attention should be sought as in some cases the bites of these spiders may develop into a medical emergency.

A likely candidate for the true identity of this spider is the dangerous Brazilian wandering spider Phoneutria nigriventer, of the family Ctenidae, as it is sometimes found hiding in clusters of bananas and is one of several spiders called the "banana spider."

Phoneutria, commonly known as Brazilian wandering spiders, armed spiders ("armadeiras", as they are known in Portuguese), or banana spiders (not to be confused with the relatively harmless Nephila), are a genus of defensive and venomous spiders of potential medical significance to humans.

They are called "armed spiders" in Portuguese because their venom is a powerful weapon.

Phoneutria, commonly known as Brazilian wandering spiders, armed spiders ("armadeiras", as they are known in Portuguese), or banana spiders (not to be confused with the relatively harmless Nephila), are a genus of defensive and venomous spiders of potential medical significance to humans.

Locals there refer to them as banana spiders.

These spiders are sometimes called Banana Spiders because of their striking yellow color.

They are also commonly called golden orb-weavers, giant wood spiders, or banana spiders.

We move carefully through hackberry and overcup oak so as not to disturb wasp nests and webs in which hang bright banana spiders.

Riding across newly cut hayfields with sweeping vistas and ducking into shadowy live oak and pine hammocks, we followed a narrow sand-and-pine needle trail, dodging the webs of huge but harmless banana spiders and avoiding prickly Spanish bayonets and hollies.

Phoneutria, commonly known as Brazilian wandering spiders, armed spiders ("armadeiras", as they are known in Portuguese), or banana spiders (not to be confused with the relatively harmless Nephila), are a genus of defensive and venomous spiders of potential medical significance to humans.

Phoneutria nigriventer toxin-3 is more commonly referred to as PhTx3.

This ranks Phoneutria venom among the most deadly spider venoms to mice.

Additionally, some Phoneutria species lack red hairs on the chelicerae, making it an unreliable identification feature.

The genus Phoneutria includes some of the relatively few species of spiders known to present a threat to humans.

The Atrax and Phoneutria spiders, which are also capable of killing people, both average around 2.5 cm.

Previously, the term referred only to the genus Phoneutria but now usually refers to the entire family Ctenidae.

'Phoneutria' has been Introduced species to Chile and Uruguay.

The spider was positively identified as a Phoneutria by Wolfgang Bücherl.

Phoneutria nigriventer - Brazil, northern Argentina; introduced to Uruguay.

Some deaths from Phoneutria bites are reported, but much of their range is in the Amazon so reporting of bites may not be very complete.

Effective antivenoms exist for Latrodectus, Atrax, and Phoneutria venom.

In Brazil, Phoneutria is only absent in the northeastern region north of Salvador, Bahia.

Phoneutria nigriventer has approximately 2 mg of venom, but frequently gives dry bites or at least does not deliver all of its available venom.

While some other araneomorph spiders have a longer leg span, the largest Phoneutria species have the longest body and the greatest body weight in this group.

The characteristic defensive posture with frontal legs held high is an especially good indicator to confirm a specimen is Phoneutria, especially alongside correct colour patterns.

However, unlike the dangerously venomous Phoneutria, bites from Cupiennius typically only have a minor effect on humans and have been compared to a bee sting.

Phoneutria are easily confused with several other non-medically significant ctenids, especially Cupiennius, in which the recently described C. chiapanensis also has bright red hairs on the chelicerae.

A study in March 2009 suggests that Phoneutria inject venom in approximately one-third of their bites, and only a small quantity in one-third of those cases.

Fortunately, the Phoneutria spiders usually do not inject venom when they bite humans, or, if they do inject venom, they do not use much.

The presence of a dark linear stripe or stripes on the frontal (dorsal) palps and presence of a single thin black line running anterior-posterior along the dorsal carapace may help identify Phoneutria.

Some experts believe that various spiders like Phoneutria can deliver a "dry" bite to purposely conserve their venom, as opposed to a more primitive spider like Atrax that usually delivers a full load .

In densely populated areas, Phoneutria species usually search for cover and dark places to hide during daytime, leading it to hide within houses, clothes, cars, boots, boxes and log piles, thus generating accidents when people disturb it.

Phoneutria are found in forests from Costa Rica, and throughout South America east of the Andes into northern Argentina, including Colombia, Venezuela, the Guianas, Ecuador, Peru, Bolivia, Brazil and Paraguay.

Despite their reputation as the world's deadliest spiders, there are multiple studies that call into question their capacity for fatal human envenomation, though some of these are labeled with a level of uncertainty, as Phoneutria are often confused with other genera of ctenids, lycosids or other large labidognatha spiders.