(C) $Sea$ $cucumber$ is the common name of $Cucumaria$. It belongs to the phylum $Echinodermata$,not $Coelenterata$ (also known as $Cnidaria$).$Sea$ $

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(C) $Sea$ $cucumber$ is the common name of $Cucumaria$. It belongs to the phylum $Echinodermata$,not $Coelenterata$ (also known as $Cnidaria$).$Sea$ $pen$ $(Pennatula)$,$Sea$ $feather$ ($Metridium$ or $Pennatula$ variants),and $Sea$ $fan$ $(Gorgonia)$ are all members of the phylum $Coelenterata$.