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swan mussel
The swan mussel, ''Anodonta cygnea'', is a large species of freshwater mussel, an aquatic bivalve mollusc in the family Unionidae, the river mussels.
Because of its morphological variability and its wide range of distribution, there are over 500 synonyms for this species.〔http://mussel-project.ua.edu/tax/intro/overnamed.html Accessed 17 November 2010.〕
==Shell description==
The shell is thin but large (approximately 10 to 20 cm) and rather flat, even at the umbo. The shell color is often pale greenish or brownish.For differences from ''Anodonta anatina'' see Animalbase below (external links).
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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