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The long solid mussel, also known as the long solid naiad, scientific name ''Fusconaia subrotunda'', is a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae. This mussel, sometimes called a pigtoe, is found in river gravel. Young mussels are light brown, but darken to nearly black with age. This species is found in Canada and the United States. == Subspecies == * ''Fusconaia subrotunda kirklandiana'' * ''Fusconaia subrotunda lesueriana Lea'' * ''Fusconaia subrotunda pilaris Lea'' * ''Fusconaia subrotunda subrotunda'' ==References== == External links == * (long solid mussel ) * ( ITIS ) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「long solid mussel」の詳細全文を読む スポンサード リンク
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