characteristics of phylum ctenophora
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Biradially symmetrical, with an oral - aboral body axis .
Eight rows of ciliated "combs" or ctenes , controlled by an apical sense organ at the aboral pole.
Incomplete gut (mouth but no anus ).
No excretory, respiratory, or circulatory systems.
Explanation:
Modern authorities, however, have separated the cnidarians and ctenophores on the basis of the following ctenophore characteristics: (1) the lack of the stinging cells (nematocysts) that are characteristic of cnidarians; (2) the existence of a definite mesoderm in the ctenophores; (3) fundamental differences in .
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it is exclusively marine ,radially symmetrical, diploblastics,their mesoglea is different from that of cnidaria
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