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Pelagothuriidae : ウィキペディア英語版 | Pelagothuriidae
Pelagothuriidae is a family of deep-sea swimming sea cucumbers. They are somewhat unusual in appearance, in comparison with other sea cucumbers, having numerous appendages, including conical papillae and leaf-like tentacles. Most of them are benthopelagic, which means that they are able to swim for a time from the bottom : the species ''Pelagothuria natatrix'' is the only true pelagic holothurian (and echinoderm, to date) ; it looks like a jellyfish. Most members of the order inhabit deep-sea environments, like ''Enypniastes''. ==Classification== Family: Pelagothuriidae * genus ''Enypniastes'' Théel, 1882 * genus ''Pelagothuria'' Ludwig, 1893
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