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''Mactra'' is a genus of medium-sized marine bivalve mollusks or clams, commonly known as trough shells or duck clams. ''Mactra'' is the type genus within the family Mactridae. The word "trough" in the common name refers to the fact that all ''Mactra'' shells have a large ligamental pit at the hinge line, which in life contains a large internal ligament. Most bivalves in other families have an external ligament instead. ==Species== * ''Mactra acutissima'' Cosel, 1995 * ''Mactra angolensis'' Cosel, 1995 * ''Mactra chinensis'' Philippi, 1846 * ''Mactra discors'' Gray, 1873 * ''Mactra glabrata'' Linnaeus, 1767 * ''Mactra glauca'' Born, 1778 * ''Mactrotoma fragilis'' Gmelin, 1791 * ''Mactra inconstans'' Cosel, 1995 * ''Mactra micronitida'' Cosel, 1995 * ''Mactra murchisoni'' Deshayes, 1854 * ''Mactra nitida'' Spengler, 1786 * ''Mactra ordinaria'' (E.A.Smith, 1898) * ''Mactra ovata'' (Gray, 1843) * ''Mactra rostrata'' Spengler, 1802 * ''Mactra sauliana'' Gray, 1838 * ''Mactra silicula'' Reeve, 1854 * ''Mactra stultorum'' (Linnaeus, 1758) * ''Mactra tristis'' (Reeve,1854) * ''Mactra vitrea'' Gray,1837 * ''Mactra veneriformis'' (シオフキガイ, ''shiofuki'', in Japanese) 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「Mactra」の詳細全文を読む スポンサード リンク
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