write two characteristic feature of pleurobrachia which are not present in hydra

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Please find below the solution to the asked query:
The two characteristic features of Pleurobrachia  are as follows:
1). Pleurobrachia shows bioluminescence whereas hydra do not have this feature.
2). Pleurobrachia has Eight rows of ciliated comb plates on its body which help in locomotion whereas hydra doesn't have these comb plates.
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