What is the key difference between a coelom and a pseudocoelom? what is the key difference between a coelom and a pseudocoelom? pseudocoeloms arose early in animal evolution and evolved into coeloms. a coelom is a true body cavity, whereas a pseudocoelom is a false coelom that is not fully functional. only a coelom is fully lined with mesoderm tissue.

-A coelom is a true body cavity, whereas a pseudocoelom is a false coelom that is not fully functional.

Explanation:

Pseudocoeloms arose early in animal evolution and evolved into coeloms. Only a coelom is fully lined with mesoderm tissue.  However the main difference is that pseudocoeloms are not truly functional and they are not like coleloms that are true body cavities.

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