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Arachnida (Spiders)
The class Arachnida includes a diverse group of arthropods: spiders, scorpions, ticks, mites, harvestmen, and their cousins. Scientists describe over 75,000 species of arachnids, the majority of them spiders. Most arachnids are carnivorous, typically preying on insects, and terrestrial, living on land. Arachnids provide an important service, keeping insect populations under control.
To be classified in the class Arachnida, an arthropod must have certain characteristics. Arachnid bodies are divided into two distinct regions, the cephalothorax and the abdomen. Four pairs of legs attach to the cephalothorax. Arachnids lack wings and antennae.
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