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2(1). Shell more than 10mm in length, thick with fibrous periostracum, usually with colour and nacre
Note: Immature specimens of Cardiida (was Corbiculiidae) may be confused with Pholadida (Sphaeriidae) due to their small size, however the growth lines are comparatively well-developed.
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-Shell less than 10mm in length, thin, fragile, often transparent, without periostracum, colour or nacre
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