How is the extracorporeal digestion associated to predation in arachnids?

How is the extracorporeal digestion associated to predation in arachnids?
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Arachnids can inoculate poison to paralyze or kill their preys using structures called chelicerae. The prey is partially digested outside the body of the arachnid by digestive enzymes inoculated together with the venom or injected posteriorly. After this extracorporeal digestion the food is ingested and gains the digestive tube of the predator where the extracellular digestion continues.
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