[forinti]

In South America there's a very aggressive spider that lives on the bananas (genus Phoneutria). Spiders usually shy away from humans but these attack and have a very nasty venom. I wonder if the heat will take nasty critters to Europe.

[anukin]

We grow bananas at our farm in India and we have never seen this spider ever.

[culi]

Brazilian wandering spiders are rarely found outside of northern South America.

[bizzletk]

Maybe they're better named Brazilian Staying-Put Spiders then

[Extropy_]

Nice one! I agree

[pvaldes]

Phoneutria are interesting animals. Needed to evolve defenses against the gluttony of monkeys. It must be a tasty spider. It happens that we are monkeys also, so the venom is carefully designed against us.

There is a registered case of a Phoneutria bite in UK at least, and the chef was sent directly to an hospital. To be fair, they dislike the cold so the spider had its reasons to be upset when he opened the fridge to grab a banana.

The spider is easily identified because it has four identical small frontal eyes arranged as a perfect square. Is big, bold and it warns before to attack [1] (most tarantulas are shy). And it jumps, of course. Can hide, once in a blue moon, in exported South American banana bunches (European breed bananas are spider free).

[1] If it raise the legs showing the yellow and black rings beneath is a clear warning saying "get lost right now, of I will land on your face"

[whyenot]

It turns out that Phoneutria defensive bites are most often "dry" with little if any venom. It's thought that the spiders conserve venom for use on actual prey items.

BTW, the four frontal eyes in a box is not considered a good taxonomic character for IDing them, as spiders in other related genera also have this. They do have a warning posture, but not a "dance" that I am aware of. Also, they are terrestrial and hunt on the forest floor. The stories of them "jumping" are largely exaggerated.

[pvaldes]

First of all, thanks for your interesting contribution.

Is a good taxonomic character if you are in Europe, as no European spider, big or small, has this eyes.

Also this is a fast way to discard other tropical spiders that could also appear on orders of imported fresh fruit and have a fearsome look but are harmless.

Tarantulas have small eyes arranged like a bowtie. Huntsmans have four eyes in a line. If you are bitten by a spider that is hairy, bigger than 10cm, and does have eyes arranged like those, is just a pinch, painful but safer than a mosquito bite. Just wash it with soap. Same if the eyes are arranged in a square but two are much bigger than the other two. Safe.

Otherwise.

If you are bitten by a cream hairy spider that has only "3 eyes", one central and two laterals (really 6 in 3 pairs) is a Sicariidae, go to a doctor.

If it has four eyes of the same size arranged in a square be cautious. If it has a middle groove in the rear part of the torax is a Ctenidae, so may be dangerous. As Phoneutria is the most common Ctenidae found in banana bunches, and as we can't discard still that every other genus on the family aren't poisonous, play safe and go to an hospital. If is a harmless related species only they can identify it, and if not you are in the correct place. They can evaluate if is a dry bite and can stabilize you and provide treatment if is not.

The other spiders that are really concerning, the Australian Atrax and Mouse spiders and the black widows are much smaller, 1-5cm, not really hairy and glossy black with red or white marks. They are mostly terrestrial.

If you have not crushed yet the spider, you may need to take a good photo from some distance. Is easier if you trap it before on a glass jar, as long as you can do it safely. If in doubt assure to bring the dead spider with you, so the doctor can see it under a microscope.

[geuis]

Lot of excellent information. Thanks. I'm glad someone out there doesn't have arachnophobia. I'm also glad it's not me.

[forinti]

The ones I know are completely brown.

They put their four front legs together, two by two, and sort of point at you.

I was told that they are aggressive because they are well fed because they feed on the sap from the bananas whereas most spiders are usually hungry.

[whyenot]

Wandering spiders do not feed on banana sap. They hunt small invertebrates on the forest floor at night and hide among bananas, or other dark and protected locations during the day. The defensive posture you described is one way to help identify them.

[GJim]

> opened the fridge to grab a banana.

A chef should know better than to keep bananas in a fridge!

[culi]

Reminds me of Cecropia trees which are adapted to use some ant species as self defense. The trees live 20-30 years (the same length as an ant queen) and exudes a protein rich substance to feed the ants called Müllerian bodies. The ants in return aggressively protect the tree.

[bromuro]

I grow a plantain orchard in South America and while i need to take double care of such spiders, they are not aggressive at all. I find them super cute and let visit my home as well. :)