which kind of Spider is the poisonous?

Question

i only know Black Widow and Tarantula , but of all you know, which is the most poisonous spider ?

Answer 1

You have to remember that there is a difference between venomous and poisonous. Poisonous organisms (such as poison ivy/oak etc) spread poison through contact with the skin, or ingestion. Venomous creatures (such as spiders and snakes) transfer toxins into the bloodstream, usually with fangs.

Many believe that the Daddy-long-legs is the most venomous spider in the world, just that their fangs are too small to pierce our skin. Others believe the Brazilian wandering spider has claimed this title (needing just 0.006mg of venom to kill a 20gm mouse.)

Answer 2

Are daddy-long-legs poisonous to humans? Maybe and No. Depending on weather you are asking about the daddy-long-leg spider or the daddy-long-leg Opiliones (see question above about daddy-long-legs). Opiliones have no fangs or venom glands. They do have defensive secretions produced by a pair of scent glands on the front end of the body but these secretions can not be injected by their mouth parts. Some people may be sensitive to the scent gland secretions but this would affect them through their lungs or through skin contact, not through bites. In very old publications (hundreds of yeas ago), the term Phalangid was used for many different animals, some of which were poisonous to humans. As discussed above, daddy-long-legs spiders are true spiders and have venom and fangs but it is a myth that pholcid spiders have venom that is highly toxic to humans. In other words, unless you develop an allergic reaction to pholcid bites, you should have no worries.

Answer 3

According to the Guinness Book of Records the world’s most venomous spiders is the Brazilian wandering spider.

Answer 4

1. That old 'Daddy-long-legs' myth is baloney.
2. It's difficult to define 'most venomous' spider - do you go by strength of venom? effect of venom? amount of venom delivered? Difficult to make a single choice. It looks like the most significantly venomous spiders, in terms of potency of effect of delivered venom, include the S. American Phoneutria (Brazilian Wandering Spider), the male Sydney Funnelweb (Atrax robustus) of Australia, and possibly the Six-eyed Sand Spider (Sicarius hahni) of southern Africa. Tarantulas are down near the bottom of the list; they depend pretty much on strength and size to subdue their prey, and have relatively mild venom as spiders go.
There are a couple non-venomous spiders, notably members of the Uloborid family, but even the venomous ones are almost all not terribly harmful; they rarely bite, and even if they bite they generally produce less effect than most common wasp and bee stings.

Answer 5

No spider is poisonous. EVERY single species of spider, however, is venomous. Yes, EVERY SINGLE ONE. Some moreso than others, and most can't pierce the skin. However, all are venomous.