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Triploblastic animals are divided into three groups based on the presence or absence of an embryonic body cavity called coelom. 1.Acoelomata - no coelom Ex : Platyhelminthes 2. Pseudocoelomata - with a false coelom Ex : Nematoda 3. Coelomata - with a true coelom
Acoelomate are those that do not have a true coelom.
Pseudocoelomate has a body cavity located between the endoderm and mesoderm.
Eucoelomate are those that have a true body cavity or coelom.