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Ptilosarcus gurneyi
''Ptilosarcus gurneyi'', the orange sea pen or fleshy sea pen, is a species of sea pen in the family Pennatulidae. It is native to the northeastern Pacific Ocean where it lives in deep water anchored by its base in sand or mud. It has received its common name because of its resemblance to a quill in a bottle of ink.
==Description==
The orange sea pen is a colonial cnidarian, the individual polyps having their own specialised functions. One, the primary polyp, loses its tentacles and forms both the stalk of the colony (known as the rachis), and the bulbous base with which it anchors itself deep into the soft substrate. Other polyps are known as secondary polyps. They include autozooids, which are feeding polyps, being armed with cnidocytes on the eight branching tentacles which form the feathery branches of the sea pen. They also contain the gonads. Other secondary polyps are siphonozooids, which can force water into and out of the colony to ventilate it. When the colony is disturbed, it can pump water out and retract into its bulbous base. At this time it emits bioluminescence, perhaps in order to startle a potential predator. The animal resembles an old-fashioned quill pen. It grows to a height of about and can be white, yellow or orange.〔(【引用サイトリンク】title=Sea pen )〕〔(【引用サイトリンク】title=Sea pen )〕
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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