Spiders (Araneae) are arthropods with eight legs and chelicerae (claws), in which the mouth of the outlet poison glands. They are the largest order of arachnids with high species diversity. Spiders are found on every continent except Antarctica and in almost every environment, in addition to air and sea. A December 2012 there were 43,678 kinds of spiders and 109 families; however in the scientific community there is confusion in how to classify these families, as evidenced by the number of over 20 different classifications that have been proposed since 1900.

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