All of the following are echinoderms,except:

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(C) The phylum $Echinodermata$ includes marine animals characterized by a water vascular system and radial symmetry in adults.$A$. Sea lily $(Antedon)

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Sea hare

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(C) The phylum $Echinodermata$ includes marine animals characterized by a water vascular system and radial symmetry in adults.$A$. Sea lily $(Antedon)$ belongs to the class $Crinoidea$ of the phylum $Echinodermata$.$B$. Sea cucumber $(Cucumaria)$ belongs to the class $Holothuroidea$ of the phylum $Echinodermata$.$C$. Sea hare $(Aplysia)$ belongs to the class $Gastropoda$ of the phylum $Mollusca$,not $Echinodermata$.$D$. Sea urchin $(Echinus)$ belongs to the class $Echinoidea$ of the phylum $Echinodermata$.Therefore,the correct answer is $C$.

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