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Arachnids (class Arachnida) include spiders, scorpions, harvestmen, mites and ticks. Arachnids
Subphylum: Chelicerata
Phylum: Arthropoda
Arachnida include spiders, scorpions, harvestmen, mites and ticks.

The body of the arachnid has two parts: anterior and posterior. The anterior part, called the cephalothorax, contains sense organs, mouth parts, and limbs. The first pair of limbs, the chelicerae may form pincers or poison fangs and the second pair, the pedipalps have been adapted for feeding, locomotion, and/or reproductive functions. The other limb pairs, generally four, are used for walking. The posterior part of the body, the abdomen, bears the genital opening and other structures. It is usually equipped with modified gills called book lungs. Arachnids are further distinguished by the fact they have no antennae and no wings


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