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Nematodes are "roundworms". Pseudocoelomates, meaning the pseudocoemomate lies between the digestive track and the muscle layer. There is no muscle layes surrounding the digestive track, as it would be for coelomates, like annelids (earthworms) Platyhelminthes are "flatworms". They are acoelomates, meaning they lack body cavity between the digestive track and the body covering. There is only a tissue filled region, but no true coelom. (Sorry, I must have pushed some inappropriate keys)

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