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Pelagothuria natatrix
''Pelagothuria natatrix'' is a species of sea cucumber, in the family Pelagothuriidae (the only species in the genus ''Pelagothuria'').
It may be the strangest species of its kind, as it looks like a jellyfish and is the only pelagic echinoderm known to date.〔
== Characteristics ==
This sea cucumber is somewhat unusual in appearance in comparison with other sea cucumbers (and even within its family), as it looks more like a jellyfish with its large umbrella-like swimming structure, its small tapered body and its swimming position with the mouth on top. The mouth is surrounded by feeding tentacles like any sea cucumber, and the veil can be retracted like jellyfishes do. It reaches around 16 cm in total diameter.〔
This species constitutes the only true pelagic holothurian (and even echinoderm) known to date.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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