Arachnids have eight legs and are further distinguished from insects (that have six legs) by the fact they have no antennae or wings.
Pictured here are Opiliones (formerly Phalangida, and better known as "harvestmen" or "daddy longlegs"), which are arachnids. They are harmless to people and known for their exceptionally long walking legs, compared to their body size. As of 2007, over 6,400 species of Phalangids have been discovered worldwide. source: wikipedia
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One square mile of land contains more insects than the total number of human beings on earth!
The Earth has a surface area of 196,939,900 square miles.
It's estimated that there are more than 200 million insects for each human on the planet!
A recent New York Times article claimed that the world holds 300 pounds of insects for every pound of humans.
There are some 900 thousand different kinds of living insects known in the world. The true number of insect species can only be estimated from present and past studies. Anywhere from 1 million to 10 million insects may still be unidentified as yet, according to scientists.
About insects ...
"These small, six-legged creatures include bees, ants, flies, mosquitoes, grasshoppers, crickets, butterflies, cockroaches, termites, fleas, and beetles. Although some insects annoy us by spreading disease, damaging crops and household items, and biting people and pets, these represent only about 17% of all the 800,000 species.
The rest of the insects serve a very valuable purpose in nature. These serve as food for birds, frogs, fish, and other animals; pollinate crops; destroy other harmful insects; give us honey, bees wax, shellac, and silk; and keep the land clean by feeding on dead animals and plants."
Source of the above: http://www.bigsiteofamazingfacts.com