Which of the following oysters have a strong inner shell layer composed of nacre, also known as mother of pearl?
A
Cliona
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B
Cheloina
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C
Pinctada
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D
Euspongia
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Solution
The correct option is CPinctada Pinctadais a genus of salt water clams, marine bivalve molluscs in the family Pteriidae, the pearl oysters. These oysters have a strong inner shell layer composed of nacre, also known as "mother of pearl". Pinctada maxima pearl oysters are the only oyster species that produces South Sea pearls.