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Carinaria cristata
''Carinaria cristata'', commonly known as the glassy nautilus,〔(【引用サイトリンク】title=Carinariidae: ''Carinaria cristata'' )〕 is a species of pelagic marine gastropod mollusc in the family Carinariidae. It is found in the Pacific Ocean and is described as being holoplanktonic, because it spends it entire life as part of the plankton. It was first described by Carl Linnaeus in 1767. Its fragile shell was much prized by early conchologists for their collections, being so rare that it was said to be worth more than its weight in gold.
==Description==
''Carinaria cristata'' is a very large gastropod mollusc that can reach a length of . The shell is a ribbed, cap-shaped cone, about as wide as it is long. It is relatively small, and the body is too large to retract inside it. The body consists of a short proboscis, a central portion and a crested tail. The whole is roughly cylindrical and has a swimming fin on the opposite side from the shell, with a small sucker on its edge. The gelatinous body is translucent, and the gut and its contents can be seen through the body wall. The retinas of the eyes are visible as two black spots. The visceral nucleus, which includes the liver, heart, gonad, sexual glands and kidneys, is a dark, stalked, triangular area protected by the shell, which also houses the gills.
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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