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 Arthropoda :: arachnida :: Scorpions 
Evolutionary History
Scorpions bear a close relationship to Eurypterids, and there is no denying the evolutionary relationships between the two groups.
Introduction to Scorpions
Scorpions are venomous arthropods of the class Arachnida and are considered relatives of the spiders, mites, ticks and harvestmen.
Relationships
Although usually grouped with the Arachnida, scorpions differ in many respects. Although Schulz places the Scorpionida as the sister group of the Pseudoscorpiones and the Solifugae...
Whip Scorpions
Scorpions are not insects, but are arachnids like spiders since they have 8 legs not like a normal insect where they have 6 legs.
 
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