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Valve (mollusc)
Valve is an anatomical term applied to the shell of those molluscs that have a shell. Although in theory any mollusc shell can be termed a "valve", the word is now most commonly applied to members of two classes of molluscs: the Bivalvia (clams) and the Polyplacophora (chitons), in other words, to those molluscs whose shells are normally composed of more than one articulating part, each one of which is known as a valve (and also, in the case of chitons, as a "plate".)
Species within one family of very unusual small sea snails, marine opisthobranch gastropods in the family Juliidae, also have two articulating shells or valves, which resemble those of a bivalve. This exceptional family is commonly known as the bivalved gastropods.
Gastropods in general are sometimes called "univalves", because in those that have a shell, the shell is usually in one part.
==Chitons==
The valves of chitons are eight dorsal, articulated shell plates, which are frequently coloured and sculpted. After death the girdle that holds the plates together disintegrates and the plates separate. Thus individual plates can be found washed up in beach drift, as shown in the image at the top of this article.
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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