What are the most unusual arachnids?
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This question is a bit subjective... but (and though I too like whipscorpions) here is a pretty unusual spider:\n\nThe Australian Bird-eating spider, or Whistling Spider (yup, it can whistle)
1060202
Labyrinth Lizards\nRainforest Rangers\nTropical Tigers
60398
Clowns! Leeches, wild boars, the boogeyman, thunder but not lightning, and cockroaches. Nothing lame like the dark or heights :P
240237
1.  Spiders\n2.  Spiders\n3.  You'll never guess!
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depends on your meaning of spider, as camel spiders are not spiders, historically there is fossil evidence of an arachnid about 1/2 a meter in span, but wether it is a true spider or one of the other rlatives in the archanid clan is under debate (in addition some thing it may be a relative of an entirely different branch of animals which currently include the millipede). most of the largest current spiders sures as the bird eater and other varieties of the South American Goliath Tarantula are usually discribes as "dinner plate" in size.
588576
Tarantulas are spiders, spiders are arthropods, and arthropods are eucoelomates. Schizocoelomates, if I remember rightly.
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LONG LIVE WOMEN...........SPIDERS!
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Goliath Birdeater, (Theraphosa leblondi) is the largest spider in the world with a leg span of up to 12 inches.
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Did you know that the shrimp's heart is in his head?\n\nSnapping shrimp create underwater noises that submarines use to hide from sonar.\n\nOne of the most unusual shrimp is the pistol shrimp, a burrow dweller whose third right appendage is adapted into a huge claw with a moveable finger that can be snapped shut with so much force that the resulting sound waves kill or stun nearby prey.
717920
Spiders and the dark.
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Insects have 6 legs. Arachnids, which are sometime mistaken for insects, have 8 legs.\n\nAnts are insects. Some arachnids you might come across in your daily life are spiders and ticks.
347054
More imformation would deffinently help. It is pretty much impossible to tell from the info you gave. What do you mean octagon spider? Does that refer to the web? Some helpful info would be the color, size, and shape of the spider, the shape, size, and location of the web, and where you found the spider (state, country, ect.). Any other information would also help. \n\nAnother thing to consider is that all spiders (other than a small, rare family) have venom. It is unlikely that they are very harmful, but again, I would need more information to say that for sure. Try a field guide (library is a good place to look) and see if you can find what kind it is, then research that one. If you want, post some more info here, and I will try to find it.
438771
There are black widow spiders in Wisconsin, and most likely there are also brown recluse spiders.\n\nBlack widows are black with a red hourglass on the underside of their shiny bodies. The Brown Recluse is another spider that is poisonous that you must be on the lookout for. It has long, skinny legs and is about one-half inch long overall. Its entire body is brown, except for a dark, violin shaped mark on its head.\n\nI believe these are the only two species of poisonous spiders in North America.
1004600
I hate to be the one to break the news to you, but actually all spiders are poisonous.. even the harmless ones like daddy long legs... look at all the elderly ppl at Okinawa.. you have nothing to be afraid of.. I could find no reference to any species of highly poisonous spider for Okinawa
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The smallest arachnid is probably one of the many mites that can be found in the world. They are a hyper diverse order (Ascaris) and have many different behaviours and requirements, some are predatory, others are detritivores, and some are parasitic or herbivorous. The parasitic varieties are quite small compared to some of the larger velvet or spider mites. I couldn't give you the name of the absolute smallest, but Im pretty sure the smallest arachnid would definatly fall into the parasitic mite catagory.\n\nGood Luck!
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Yes y am familiar with this kind of spider.y am from Romania and we have a lot of them around.it is called the metal spider.yes is poison es but it is very slow but he can camouflage itself very well.
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To heck with the spider,although neat and ever seeing.Check out the exo-skelatons.