Spiders and mites are not insects Bashny.Net

Despite the fact that these being similar in all other insects, spiders, scorpions, mites and, nevertheless, do not have to do with them. They stand out in a class of arthropods - Arachnids (lat. Arachnida).

The main external difference arachnids from insects - in the number of legs, they have four pairs of arachnids and insects - three. By the way, according to a recent study conducted by the French biologist, the fourth pair of legs is not so necessary arachnids, rather it is a "reserve" in case the basic anything happens.

via factroom.ru