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Toxicity
While some types of worms are edible, the hammerhead worm is not among them. The planarian contains the potent neurotoxin, tetrodotoxin, which the worm uses to immobilize prey and deter predators The toxin is also found in pufferfish, the blue-ringed octopus, and rough-skinned newts, but was not known to occur in any species of terrestrial invertebrate prior to its discovery in the hammerhead worm.
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