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 Arthropoda :: arachnida 
Ask any man in the street what a scorpion is and probably you will be stared upon in disbelief. Children from 8 years old to a 120 years old man would most likely have an idea what a scorpion looks like. Or do they? Probing further and asking them how many legs a scorpion has and many would suddenly hesitate. Answers ranges from 3 pairs to a amazing 8 pairs!!
Spiders have a great range of variation and lifestyle, although all are predatory. Spiders are the most important link in the regulation of the number of insects. Every day they devour over 100 kg on 1 hectare of a meadow.
This large Class of arthropods includes over 60,000 described species (and most likely a very large number of so-far undescribed ones).
The mites and ticks, Order Acarina or Acari belong to the Arachnida and are among the most diverse and successful of all the invertebrate groups, although some way behind the insects.
Tick is the common name for the small wingless arachnids that, along with mites, comprise the order Acarina. Ticks are external parasites, living off the blood of mammals, birds, and occasionally reptiles and amphibians.
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