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''Mercenaria'' is a genus of edible saltwater clams, marine bivalve molluscs in the family Veneridae, the Venus clams.〔(ITIS )〕 The genus ''Mercenaria'' includes the quahogs, ''Mercenaria mercenaria'', the northern quahog or hard clam, and ''M. campechiensis'', the southern quahog. These two species commonly hybridise where their ranges overlap. Mercenaria mercenaria is further subdivided in the marketplace and thence in the kitchen by size: the largest being the quahog or chowder clam, then smaller cherrystones, and smallest littlenecks; some markets also differentiate top necks which are intermediate in size between cherrystones and littlenecks. The smaller clams are eaten raw throughout New England, New York, and New Jersey; the larger clams are more suited for cooking. Other species within the genus include the venus clam ''M. stimpsoni'' found in north Pacific waters. All these species were formerly placed in the related genus ''Venus''. ==Species== The World Register of Marine Species accepts the following extant species as valid:〔(''Mercenaria'' Schumacher, 1817 ) World Register of Marine Species. Retrieved 2011-09-30.〕 * ''Mercenaria campechiensis'' (Gmelin, 1791) – Southern quahog * ''Mercenaria mercenaria'' (Linnaeus, 1758) – Northern quahog * ''Mercenaria stimpsoni'' (Gould, 1861) – Venus clam * ''Mercenaria texana'' (Dall, 1902) 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「Mercenaria」の詳細全文を読む スポンサード リンク
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