Sìjiǎogélí shì Huánghǎi yán'àn chángjiàn de bèilèi.
The four-cornered clam is a common bivalve along the Yellow Sea coast.
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四角 ("four corners") describes the trapezoidal shell outline - unlike the rounded 文蛤 or elongated 蛏. Major aquaculture and wild-harvest species in Shandong and Jiangsu.
