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''Tresus'' is a genus of saltwater clams, marine bivalve mollusks in the family Mactridae. Many of them are known under the common name the horse clam or as species of gaper clam. They are similar to geoducks. ==Species== Species within the genus ''Tresus'' include: * ''Tresus allomyax'' (Coan & Scott, 2000) – strange gaper * ''Tresus capax'' (Gould, 1850) – fat gaper * ''Tresus keenae'' (Kuroda & Habe, 1950) – mirugai clam * ''Tresus nuttallii'' (Conrad, 1837) – Pacific gaper * ''Tresus pajaroanus'' (Conrad, 1857) – lost gaper 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「Tresus」の詳細全文を読む スポンサード リンク
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