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Calyptraeidae
The Calyptraeidae, the slipper snails or slipper limpets, cup-and-saucer snails, and Chinese hat snails, are a family of small to medium-sized marine prosobranch gastropods. This family includes the slipper snails (''Crepidula'' species), the Chinese hat snails, (''Calyptraea'' species), and the cup-and-saucer snails (''Crucibulum'' species) among others.
The Calyptraeidae are the only family in the superfamily Calyptraeoidea. This family has no subfamilies according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005.
''Crepidula fornicata'' was brought to Europe on imported American oysters in the late 19th century and is now considered a significant pest in European oyster beds.〔(【引用サイトリンク】 title=Crepidula fornicata )〕
==Description==
Internally, the shell is distinguished by a shelf-like, cup-like, or half-cup-like structure used for muscle attachment. Some calyptraeids have shells that externally resemble those of limpets, so species in the genus ''Crepidula'' are often called slipper limpets. However, these snails are not closely related to true limpets and are more closely related to conches and cowries. The "slipper" in the name "slipper limpet" is based on the appearance of the inside of the shell, which with its half-shelf resembles a traditional western bedroom slipper.
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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