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Acoelomata In acoelomata, the body cavity is not seen. The space between outer body wall (skin) and inner body wall (alimentary canal) is occupied by a tissue called mesenchyme. This condition is seen in flat worms (Platyhelminthes..

Eucoelomata In Eucoelomata a true body cavity is present. It is called coelom. It is a body cavity which is lined by mesoderm (or coelomic epithelium). This condition is seen in the remaining group of animals from annelids to vertebrates. fig. 10.2 - Diagrams to Show Acoelomate, Pseudocoeloma..

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