Q.
Which of the following phyla has members with a true coelom?
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Solution:
The animals which possess true coelom are called eucoelomates or coelomates. The true coelom is a body cavity which arises as a cavity in embryonic mesoderm. It is present in • Annelida, Arthropoda, Mollusca (Schizocoelom), Echinodermata and Chordata (Enterocoelom). Members of Phylum Coelenterata and Phylum Platyhelminthes are acoelomates i.e., they do not have coelom. Members of Phylum Aschelminthes are pseudocoelomates i.e., they have a false coelom, derived from blastocoel of the embryo.