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Common slipper shell : ウィキペディア英語版
Common slipper shell

The common slipper shell, ''Crepidula fornicata'', has many other common names, including common Atlantic slippersnail, boat shell, quarterdeck shell, fornicating slipper snail, Atlantic Slipper Limpet and it is known in Britain as the "common slipper limpet". This is a species of medium-sized sea snail, a marine gastropod mollusc in the family Calyptraeidae, the slipper snails and cup and saucer snails.
== Description ==

The size of the shell is 20–50 mm.〔 The maximum recorded shell length is 56 mm.〔Welch J. J. (2010). "The "Island Rule" and Deep-Sea Gastropods: Re-Examining the Evidence". ''PLoS ONE'' 5(1): e8776. .〕
This sea snail has an arched, rounded shell. On the inside of the shell there is a white "deck", which causes the shell to resemble a boat or a slipper, hence the common names. There is variability in the shape of the shell: some shells are more arched than others.
Groups of individuals are often found heaped up and fastened together, with the larger, older females below and the smaller, younger males on top. As a heap grows, the males turn into females (making them sequential hermaphrodites).〔(【引用サイトリンク】url=http://www.ciesm.org/atlas/CrepidulForni.html )

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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