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Is A Black Spider With White Dots Poisonous?

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Jack Buckby Profile
Jack Buckby answered
It could be poisonous,  so your best strategy would be to leave it alone.

You really need a much more detailed description or, even better, a photo, for anyone to be able to identify the spider as there are many with black and white markings.

Think how big it was, and whether it was furry? Were the dots all over the body? Were there any other distinguishing marks? It's behavior could also be relevant to identifying it.

You might have encountered a phidipus spider which are relatively common in the west of the USA. They are a type of jumping spider and there are around 60 described species.
Phidippus californicus is commonly found in the south west of the USA, especially in Arizona, New Mexico, Nevada, Texas and Utah. This particular type usually has some visible red on its body too.
Phidippus spiders are usually active from mid-morning to dusk and you're most likely to see them in bushes. They are often observed running along branches, frequently stopping to scan their surroundings.
It's retreat is a slightly flattened tube of silk, surrounded by guy-lines that attach it to the twigs or leaves of the bush.
As for whether it is venemous, Phidippus spiders do use poison on their prey after they have trapped it. But as the prey is usually wasps, flies and other small insects, only a small amount is required. They are, therefore, relatively harmless to humans.
Be warned though, the spider you saw may not be one of these. Black and white are common insect colors so don't go picking one of these up without being sure about what it is.
thanked the writer.
Anonymous
Anonymous commented
I have one of these guys staring at me right now. If they eat other spiders, he is free to live here. They are kind of cute, actually.
Novi Pamila Profile
Novi Pamila answered
A spider relatively close to this description is the parson spider. Maybe that's what you saw.
Anonymous Profile
Anonymous answered


All spiders are venomous and carnivorous, however, the vast majority are not harmful to humans. Unless your spider is glossy with a very rounded abdomen, if it's a small spider (nickel sized or smaller) there isn't much chance of it being harmful even if it does bite you. Always wash and inspect any fruit originating from the tropics thoroughly and carefully, as Brazilian Wandering spiders have been known to hitch rides on bananas or other fruits. If you are bitten, the best early signs to watch for if you've been bitten by a particularly venomous spider are: Tingling, intense pain, or numbness at the site of the bite, nausea or stomach ache, rapid or slowing heart rate, sweating, confusion, dizziness, shortness of breath, or swelling of the tongue, throat, or esophagus. If there is merely some pain or itching at the injection site, you should be fine, but it's always a good idea to keep the spider if possible and seek medical attention if you are unsure.

Anonymous Profile
Anonymous answered
I seen a black spider with a white dot on it's back, and had very long legs, what kind of spider is that?
Anonymous Profile
Anonymous answered
Yes, but only found in Europe.
marty mccrorey Profile
marty mccrorey answered
No. There are no "poisonous" spiders, snakes, or any other animal for that matter. The term is "venomous". Big difference. Spiders bite to paralyze their prey, then consume it. Most spiders in north america possess a non-toxic venom to humans. The exception would be the brown recluse and black widow.
Anonymous Profile
Anonymous answered
I cannot say if they are poisonous but they are jumping spiders and they are HUGE!!!
Janey Profile
Janey answered
That's a Daring Jumping spider and it's not poisonous, but it can bite especially if handled.
marty mccrorey Profile
marty mccrorey answered
Spiders are not "poisonous". They are venomous. They use this to subdue their prey. But in north america all spiders except two have non-toxic venom. The black widow and brown recluse can pose a danger to humans due to the size of their venom glands and toxicity. The good news is these spiders do not go around thinking about nothing but biting humans. They only bite when there is no other alternative.
Anonymous Profile
Anonymous answered
That sounds like Phiddipus Audax, which is a type of jumping spider most commonly found in North America... I wish I could say they're harmless but if feeling threatened, they can jump up to 2 feet.. And yes they bite. If you'd like more picture or information just google it :)
Ginger Snaps Profile
Ginger Snaps answered
All spiders are poisonous to one extent or another, however not all are life threatening.The only ones that aren't poisonous are daddy long legs and that because technically they are not a spider.

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