First slide
Basis of Classification
Question

Identify the animals without a body cavity and with a body cavity not lined by peritoneum. 

Easy
Solution

Acoelomates lack a body cavity. 

Pseudocoelomates have a body cavity not lined by mesodermal peritoneum. 

Coelomates (schizocoelomates and enterocoelomates) have a body cavity lined by mesodermal peritoneum.

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