Pseudocoelom is the coelom formed from persistent blastocoel which lacks lining of mesoderm. Members of phylum?Aschelminthes (nematoda) have pseudocoelom eg, phylum?Annelida, Mollusca and Echinodermata belongs to sub-division Eucoelomata. So members of these phylum have true coelom ie, coelom with lining of mesoderm.