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Macoma balthica : ウィキペディア英語版 | Macoma balthica
''Macoma balthica'', commonly called the ''Baltic macoma'', ''Baltic clam'' or ''Baltic tellin'',〔Gofas, Serge (2010). (''Macoma balthica'' (Linnaeus, 1758). ) In: Bouchet, P.; Gofas, S.; Rosenberg, G. (2010) World Marine Mollusca database. World Register of Marine Species (accessed 2010-11-27)〕〔 is a small saltwater clam, a marine bivalve mollusk in the family Tellinidae (the macomas and tellins). ==Appearance==
The shells are smooth, relatively flat, oval or somewhat trigonal in shape, and less than 30 mm long.〔(''Macoma balthica'' (Linnaeus, 1758) ) Marine Bivalve Shells of the British Isles. National Museum Wales (2014)〕 The shell color is polymorphic, varying between individuals and between localities. Often most specimens are white, sometimes most are pink, and also yellow and orange shells may occur. Color is best visible in worn-out dead shells and inside the shell. Concentric growth rings indicating the age of the specimen are often clearly visible.
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